Tuesday, November 20, 2007

Handbook on Aging and Cognition

I don't often make posts about new book advertisements that pass through my email box, but I thought this one might be worthy of mention, primarily because I've always been impressed with the cognition/intelligence research completed by one of the editors (Dr. Tim Salthouse). Check out the new edited text Handbook on Aging and Cognition. I've not read the book nor do I have a copy (hint....if the publisher is reading this post...how about a free copy for the blogmaster).

Friday, November 16, 2007

Brain clock = g (general intelligence)?

[Double click on image to enlarge]
Check out intriguing post at my sister blog (the IQ Brain Clock) re: another study that suggests that temporal processing (temporal g) may be more related to psychometric intelligence/g than the classic reaction time g paradigm.

CHC and WJ III dissertations 11-16-07

The other day I posted a list of 19 CHC (Cattell-Horn-Carroll) based dissertations (titles and abstracts) that have been published in the past five years. I've now expanded this list to include WJ III dissertations published during the past five years. The total n is now approximately 30. Title pages and abstracts can be found by clicking here.

I've set an email alert with my university to notify me of new dissertations in these two areas (CHC and WJ III) and will pass along FYI's on new and notable dissertations as they come in.

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Wednesday, November 14, 2007

Autism research bibliography


Over the past year there has been a steady increase in people who have contacted me to ask my opinion regarding CHC-based assessment of individuals with autism. I respond honestly ....saying that I have spent little time studying this specific developmental disability. Today I decided to run a search of my IAP Reference Database...to see what literature I might skim to "get up to speed." I was amazed at the number of references I had accumulated over the past few years (over 400). This is definitely a hot topic of contemporary research.

I've decided to make the result of my search available to others. Click here if you want to view/download/print a copy.


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Cattell-Horn-Carroll dissertations

I just ran a search of my university library to locate any and all possible Cattell-Horn-Carroll (CHC) dissertations that have been recently completed. I found just under 20 such dissertations. The list (including abstracts) can be found by clicking here.

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Psychology book nook reviews 11-14-07


A new issue of PsycCRITIQUES is available online.



November 14, 2007
Volume 52, Issue 46


Book Reviews
1. The Psychology of Genocide, Massacres, and Extreme Violence: Why “Normal” People Come to Commit Atrocities
Author: Donald G. Dutton
Reviewer: Anthony J. Marsella

2. Behavioral Consultation and Primary Care: A Guide to Integrating Services
Authors: Patricia J. Robinson and Jeffrey T. Reiter
Reviewer: Nicholas A. Cummings

3. Social History Assessment
Author: Arlene Bowers Andrews
Reviewer: Leslie M. Lothstein

4. Handbook of Narrative Inquiry: Mapping a Methodology
Author: D. Jean Clandinin (Ed.)
Reviewer: David Manier

5. Handbook of Emotion Regulation
Author: James J. Gross (Ed.)
Reviewer: Lisa M. Bauer

6. Married with Special-Needs Children: A Couples' Guide to Keeping Connected
Authors: Laura E. Marshak and Fran Pollock Prezant
Reviewer: Anisha Shah

7. Understanding Personality Disorders: An Introduction
Author: Duane L. Dobbert
Reviewer: Kristin B. Webb

8. ADHD Grown Up: A Guide to Adolescent and Adult ADHD
Author: Joel L. Young
Reviewer: Marcia McCabe

9. Missing Data: A Gentle Introduction
Authors: Patrick E. McKnight, Katherine M. McKnight, Souraya Sidani, and Aurelio José Figueredo
Reviewer: Francis C. Staskon

10. Getting Help: The Complete and Authoritative Guide to Self-Assessment and Treatment of Mental Health Problems
Author: Jeffrey C. Wood
Reviewer: Erica J. Gannon

11. Examinations of Criminal Responsibility: Foundations in Mental Health Case Law
Author: Richard I. Frederick, David F. Mrad, & Richart L. DeMier
Reviewer: Kimberly Kirkland

12. Brain Aging: Models, Methods, and Mechanisms
Author: David R. Riddle (Ed.)
Reviewer: Richard H. Cox

13. The Identity Trap: Saving Our Teens From Themselves
Author: Joseph Nowinski
Reviewer: F. Richard Ferraro

14. Why Is Math So Hard for Some Children? The Nature and Origins of Mathematical Learning Difficulties and Disabilities
Authors: Daniel B. Berch and Michèle M. M. Mazzocco (Eds.)
Reviewer: Stephen A. Truhon

15. Bad Religion: The Psychology of Religious Misbehavior
Author: Michael L. Klassen
Reviewer: Benjamin Beit-Hallahmi

16. Tough Choices or Tough Times: The Report of the New Commission on the Skills of the American Workforce
Authors: National Center on Education and the Economy
Reviewer: Kathleen Sullivan Brown

Video Review
17. Obsessive-Compulsive Behavior
with Martin M. Antony
Reviewer: Elaine L. Phillips

Film Review
18. Thin
Director: Lauren Greenfield
Reviewer: Randall C. Flanery

Tuesday, November 13, 2007

Can frontal brain age-related atrophy increase gambling, depression and prejudice?

Another nice research summary in one of my favorite journals for quick contemporary research updates....Current Directions in Psychological Science. von Hippel (2007) presents a summary that suggests that age-related atrophy of the brains frontal lobes (which is the primary seat of executive functions), which can produce increased disinhibition in behavior, might be causative variables in increased prejudice, gambling, and depression in the elderly.


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Monday, November 12, 2007

IQ's Corner Headlines 11-10-07

All the news thats fit for IQ's Corner readers:

This is the 42nd installment of IQs Corner Headlines from the Brain and Mind Blogsphere. If you like this little e-newsletter you can sign up to receive it daily (delivered to your email inbox by visiting the boxes at the bottom of this blog page).

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RIAS overview/review article

My two recent RIAS posts seem to be generating some interest. I just received a copy of another RIAS journal article, written in the context of gifted identification, from one of the test authors - Dr. Cecil Reynolds. I'm posting it here so folks can access additional RIAS published material.

Enjoy.

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Parallel test forms explanation

Thanks to my Pearson/AGS friend, Jeff Evans, for sending a link to an easy-to-understand explanation of parallel test forms (e.g., Form A and B).

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RIAS factor structure - another study

This is a follow-up to the portion of my 11-9-07 "Research Bytes" post dealing with the factor structure of the Reynolds Intellectual Assessment Scales.

After suggesting that the Nelson et al. (2007) study would have been more powerful if they had also factor analyzed the correlation matrices in the RIAS manual (along side their factor analysis in an independent referral sample), an email arrived from Dr. Alex Beaujean indicating he had completed the analysis I had suggested---and more (added yet a third sample). Dr. Beaujean currently has the manuscript under journal review, so it would be inappropriate to provide a complete copy here. However, Dr. Beaujean did agree to let me publish the abstract from the current submitted paper.

If you want additional information re: this research, contact Dr. Beaujean.

  • Beaujean, A. A., McGlaughlin, S. M. & Margulies, A. S. (submitted). Factorial Validity of the Reynolds Intellectual Assessment Scales for Referred Students.
Abstract
  • The Reynolds Intellectual Assessment Scales (RIAS; Reynolds & Kamphaus, 2003, 2005), is a recently-developed, individually-administered psychometric instrument designed to measure general cognitive ability, as well as verbal (crystallized) intelligence, nonverbal (fluid) intelligence, and memory. Although it has been in circulation for over four years, there is a paucity of independent research published about its psychometric properties. The purpose of this study was to examine the factor structure of the RIAS across three samples of school-age children: the RIAS norming sample, the data reported in Nelson,Canivez, Lindstrom, and Hatt (2007), and a new, independent sample of students referred for special educational services. Using confirmatory factor analytic techniques, this study found that a two-factor model, positing verbal and nonverbal factors, fit all three data sets better than a one-factor model. Further, the two-factor model appeared invariant across the three samples, except for one subtest's residual variance. Implications of this study for practitioners are then discussed.
  • Nelson, J. M., Canivez, G. L., Lindstrom, W., & Hatt, C. V. (2007). Higher-order exploratory factor analysis of the Reynolds Intellectual Assessment Scales with a referred sample. Journal of School Psychology, 45, 439–456.
  • Reynolds, C. R., & Kamphaus, R. W. (2003). Reynolds Intellectual Assessment Scales. Lutz, FL: Psychological Assessment Resources.
  • Reynolds, C. R., & Kamphaus, R. W. (2005). Introduction to Reynolds Intellectual
    Assessment Scales and the Reynolds Intellectual Screening Test. In D. P. Flanagan & P. L. Harrison (Eds.), Contemporary intellectual assessment (2nd ed., pp.461–483). New York: Guilford.


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Friday, November 09, 2007

IQ Research bytes #2: WJ III, CoGAT, RIAS

Check out the following research articles re: commonly used group (CoGAT) and individually administered (WJ III: RIAS) intelligence tests.

1. Although not that recent (2003), I just discovered a manuscript by David Lohman, coauthor of the CoGAT (group IQ test), where he presents the results of an investigation between the relations of the group-based CoGAT scores and scores from the individually administered Woodcock-Johnson Tests of Cognitive Ability--Third Edition (WJ III ; conflict of interest disclosure - I'm a co-author of the WJ III, and both the CoGAT and WJ III are published by Riverside Publishing). The title, abstract, and a link to a pdf copy of manuscript is below.

  • Lohman, D. (2003, March). The Woodcock-Johnson III and the Cognitive Abilities Test (Form 6): A Concurrent Validity Study (click here to view)
  • Abstract - This study investigated the concurrent validity of the Woodcock-Johnson III (WJ-III; Woodcock, McGrew, & Mather, 2001) and Form 6 of the Cognitive Abilities Test (CogAT; Lohman & Hagen, 2001). A total of 178 students in grades 2, 5, and 9 were administered 13 tests from the WJ-III and the appropriate level of the CogAT. Interbattery confirmatory factor analyses showed that the general factors on the two batteries correlated r = .82. Correlations between broad-group clusters on the WJ-III and battery-level scores on the CogAT generally supported the construct interpretations of each, but also suggested important differences in the abilities measured by both batteries.

2. In another WJ III related study (see conflict of interest disclosure statement above), Craig Firsby and Steven Osterlind present a follow-up to an earlier descriptive analysis of the WJ III Test Session Observation Checklist norm data. Their most recent analysis focused on potential differences in examiner ratings for self-identified Hispanic's in the WJ III standardization sample. The abstract and article speak for themselves. See information below.

  • Frisby, C. & Osterlind, C. (2007). Hispanic Test-Session Behavior on the Woodcock Johnson Psychoeducational Battery– Third Edition. Journal of Psyhoeducational Assessment, 25 (3), 257-270. (click here to view)
  • Abstract--This study examined potential differential examiner ratings for a large sample of self-identified Hispanics on the Woodcock Johnson Psychoeducational Battery–Third Edition (WJ-III) Test Session Observation Checklist (TSOC). Both between-group (Hispanics vs. non-Hispanics) and within-group analyses (Hispanics disaggregated by first spoken language, language spoken in the home, and mother’s highest educational level) were conducted. Four research hypotheses were tested through 44 analyses. Most comparisons were not statistically significant, and across- and within-group differences had minimal influence in analyses that were statistically significant. The authors conclude that there is no compelling evidence of substantial systematic differences in examiner ratings of Hispanics’ test-session behaviors on the WJ-III.

3. Finally, Nelson et al. (2007) report an independent investigation of the internal (structural) validity of the Reynolds Inellectual Assessment Scales (RIAS). The article information is below. The long story short - Nelson et al. conclude that their factor extraction methods were more rigorous and appropriate than the exploratory (EFA) and confirmatory factor analysis (CFA) reported by the RIAS authors. More importantly, Nelson et al. conclude that the RIAS should only be interpreted as a single-factor measure of g (general intelligence). Their analysis did not support a three-factor structure presented by the RIAS authors. As we all know, the "my factor analysis methods are better than your factor analysis methods" has been a common battle cry in the factor analysis literature for decades. Regardless of this caveat, I do have a couple of comments based on my quick skim of the article.

First, I concur with Nelson et al. that the EFA methods should include oblique correlated factors...and not orthogonal (uncorrelated) factors as reported by the test authors. Cognitive abilities are correlated and this should be modeled in the analyses. Second, in defense of the RIAS authors, the Nelson et al. sample consists of referred subjects, and not a nationally representative sample. Although referral samples are much better for investigating the factor structure of instruments than clinical samples (e.g., LD), it is possible that the Nelson et al. results are influenced by characteristics of the non-normal sample. Third, I believe that the continued criticism of the over-use of CFA methods in test development is misdirected. If one reads the writings of one of the fathers of SEM-based methods (Joreskog), SEM methods (in this case CFA) can be used not only for model confirmation, but also may play a critical role in "model development and generation." Those of us who develop measures of cognitive abilities often use CFA as a model generation/building tool as per Joreskog . And..this is OK.

Fourth, since all test manuals must report test intercorrelation matrices as per the Joint Test Standards, it is possible for independent researchers to import the published correlation matrices into standard stat software and factor analyze the orignal norm-based correlations. Given this possibility, it would have been nice if Nelson et al. would have included, as a companion to their factor analysis in the referral sample, a similar analysis (using the same logic and methods) of the same correlation matrices the RIAS authors used. If similar results were found vis-a-vis the application of their methods in both the norm and referred samples, it would make their arguement stronger.

Cecil.....I know you catch my blog every now and then. If you would like to prepare a response to the Nelson et al. article, I'd be happy to post it as a guest blog post.

  • Nelson, J., Canivez, G., Lindstrom, W. & Hatt, C. (2007) Higher-order exploratory factor analysis of the Reynolds Intellectual Assessment Scales with a referred sample. Journal of School Psychology, 45, 439-456 (click here to view)
  • Abstract--The factor structure of the Reynolds Intellectual Assessment Scales (RIAS; [Reynolds, C.R., & Kamphaus, R.W. (2003). Reynolds Intellectual Assessment Scales. Lutz, FL: Psychological Assessment Resources, Inc.]) was investigated with a large (N=1163) independent sample of referred students (ages 6–18). More rigorous factor extraction criteria (viz., Horn's parallel analysis (HPA); [Horn, J.L. (1965). A rationale and test for the number of factors in factor analysis. Psychometrika, 30, 179–185.], and Minimum Average Partial (MAP) analysis; [Velicer, W.F. (1976). Determining the number of components from the matrix of partial correlations. Psychometrika, 41, 321–327.]), in addition to those used in RIAS development, were investigated. Exploratory factor analyses using both orthogonal and oblique rotations and higher-order exploratory factor analyses using the Schmid and Leiman [Schmid, J., and Leiman, J.M. (1957). The development of hierarchical factor solutions. Psychometrika, 22, 53–61.] procedure were conducted. All factor extraction criteria indicated extraction of only one factor. Oblique rotations resulted in different results than orthogonal rotations, and higher-order factor analysis indicated the largest amount of variance was accounted for by the general intelligence factor. The proposed three-factor solution was not supported. Implications for the use of the RIAS with similarly referred students are discussed.


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CHC theory "up north" - Oh Canada.....


I'm currently flying back from a presentation at the British Columbia Association of School Psychologists (BCASP) annual conference in Vancouver, BC. The title of my presentation was "Beyond the CHC theory tipping point: Back to the future." My plan (subject to change due to the whims...and..more importantly...the time constraints of the blog dictator) is to eventually post an on-line version of my PPT slides...which will be announced at here at IQ's Corner.

I want to thank the BCASP members for the speaking opportunity and the warm welcome and gracious treatment. I also want to say "thanks" for the kick-ass insulated BCASP coffee travel mug they gave me as a gift. Finally, a special thanks to Dr. Laurie Ford, current director of the school psychology program at UBC. Laurie is a long-time friend and colleague who initiated the invitation and who took good care of me at the conference. Thanks Laurie.

This is the second CHC theory presentation I've made "up north" since October. In October I made a similar presentation in Calgary (with a greater emphasis on the WJ III battery and links to intervention planning) together with long-time friend and colleague, Barb Wendling. Dr. Don Saklofske from the University of Calgary initiated and coordinated this presentation. Like Laurie, he was a very gracious host. The picture above is of myself (front row, light sport coat, Don (next to me), Barb (far left on picture), and a number of Don's graduate students in school psychology at Calgary. This group also gave me some cool gifts....a U Calgary T-shirt and hat. This hat has become my favorite hat to wear when I need to work outside and there is a nip in the air.

I want to thank my Canadian neighbors and welcome them as new readers at this blog. It was a pleasure to "spread the gospel" re: the importance of theory-based (CHC theory) intelligence testing...and how clinical practice needs to catch up with current CHC theory and CHC-grounded assessment instruments and approaches.


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Saturday, November 03, 2007

IQ's Corner Headlines - 11-3-07

All the news thats fit for IQ's Corner readers:

This is the 41st installment of IQs Corner Headlines from the Brain and Mind Blogsphere. If you like this little e-newsletter you can sign up to receive it daily (delivered to your email inbox by visiting the boxes at the bottom of this blog page).

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Random tidbits from mind blogosphere 11-3-07

  • Check out one of the best brain/mind blogs around (Developing Intelligence) for an interesting post on subliminal "fast priming" influences on word interpretation.
  • Mind Hacks routinely provides a list of recent posts of interest...called "spike activity." Check out a sample post for 11-2-07 for an example of the diversity of FYI's included in these routine reports.
  • Just in time for holiday shopping for that certain lady in your life....the Brain Bag purse.
  • A number of interesting posts on aging and the brain. First, an interesting, and bit scary, report that 1 in 60 adults may be walking around with some form of brain abnormality. Next, check out Perusing Psychology for a realistic (and sometimes sobering...for us over 30 years of age) look at the neuropsychology of changes in the brain as we age. Finally, check out On the Brain for a top ten list of misconceptions by scientists and the public re: the neurological bases of memory/cognitive loss in aging.
  • Check out the top brain fitness blog (Sharp Brains) for a report on the top 10 neuroscience trends in 2007.



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Friday, November 02, 2007

Large-scale navigational Gv (visual-spatial) abilities

I just skimmed another article that suggests that the CHC cognitive ability taxonomy may need to be broadened to include a broader array of Gv (visual-spatial) abilities, namely, Gv abilities that help with large-field spatial navigation. I've previously FYI'd folks about recent research indicating that large scale navigational Gv abilities are separate from small-scale traditional psychometric Gv tasks (those found in typical intelligence batteries).

The most recent article (Eliot, 2007 - The Development of an Everyday Spatial Behavioral Questionnaire) I skimmed suggested two apparent continua of large-scale spatial abilities--movement through space and drawing/perceiving perspective/path finding (also possibly called dimensional discernment).

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Working memory: Special issue of Psychologia


The journal Psychologia, which I can not access via my university library, has a special issue devoted to various topics in working memory. You can check out the table of contents for this issue here. If anyone has access to copies of these articles in pdf format, I'd love to receive copies via email (iap@earthlink.net)


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Monday, October 29, 2007

Random tidbits from the mind blogosphere 10-29-07



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What is intelligence: Beyond the Flynn Effect


It looks like James Flynn (of the infamous "Flynn Effect" fame) has just published a new book on intelligence. I've not read it nor do I have a copy. This is an fyi post.

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Friday, October 19, 2007

Cognitive efficiency (working memory+Gs) = necessary but not sufficient constructs for learning?

As promised, here are a few thoughts from my Friday afternoon synaptic symphony of musings related to Geary's article on math learning.

On page 482 Geary talks about the core cognitive mechanisms (of working memory and Gf) being mental speed of information processing and attentional control (which I interpret as Engle, Conway et al.'s executive controlled attention). The overlap of these constructs with working memory and Gs (what we, in the land of the WJ III, call cognitive efficiency) is very interesting. In recent presentations I've referred to these core abilities as domain-general constructs...as recent CHC research suggests they are important for learning across almost all domains of human learning, esp. during initial stages of learning. These contrast with domain-specific abilities that appear more specific to learning in specific achievement domains (e.g., Ga and reading; Gf and mathematics).

I like his statement that these mechanisms are "necessary but not sufficient" for the development of secondary abilities (e.g., mathematics; reading). This makes sense. Domain general cognitive efficiency may be a set of necessary, but not sufficient, abilities for learning. They are necessary to learn, but the development of secondary abilities (such as reading and math) may require the addition of other abilities (Glr, Gf, Ga, Gv, etc.)) above and beyond cognitive efficiency.

This also connects with some causal models I've run where working memory, memory span, and Gs are specified as causal mechanism behind other cognitive abilities and achievement.

Just some Friday afternoon musings and thoughts as I "connect some dots" in my quirky store of acquired knowledge.

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Math learning and LD: Synthesis article by Geary

Every so often I run across a book or journal article that, in my opinion, resonates with considerable clarity re: something important regarding human intelligence and or understanding learning and or learning disabilities. I'm not sure if these readings, as viewed by others, would be accorded similar value, or if the readings just hit me at a time when I'm trying to "connect the dots" across the diverse literature that I skim on a routine basis.

I just finished skimming one such article. The article is by David Geary in Developmental Neuropsychology (2007, vol 32[1], p. 471-519; click here to view). The title of the article is "An evolutionary perspective on learning disabilities in mathematics." I try to read anything that David Geary writes as, IMHO, he is one of the top notch intelligence/cognitive scholars of our times, particularly as his research relates to helping us understand an important aspect of school learning--mathematics.

I plan (hope) to make a number of posts as I distill the essence of what he has written. The real beauty of this article is that it is a grand synthesis article that puts, in one place, his current synthesis of contemporary research on the development of mathematics and possible causes of math learning disabilities.

At this time I'm just alerting my readers to the article and making it available for viewing. Although some of the evolutionary material may be a bit difficult to digest, and does not have direct application to applied intelligence testing and interventions, the remainder of the article is packed with useful summary statements regarding the potential cognitive mechanisms, underlying neuroanatomy, etc. of mathematical learning.

More to come. But in the meantime, please read and digest on your own pace. I urge readers to take the time to become familiar with this article, as well as other research published by David Geary (a select list is below).

  • Fink, B., Brookes, H., Neave, N., Manning, J. T., & Geary, D. C. (2006). Second to fourth digit ratio and numerical competence in children. Brain and Cognition, 61(2), 211-218.
  • Geary, D. C. (2001). The development of intelligence, by M. Anderson. Contemporary Psychology APA Review of Books, 46(1), 23-25.
  • Geary, D. C. (1999). Evolution and developmental sex differences. Current Directions in Psychological Science, 8(4), 115-120.
  • Geary, D. C. (2007). An evolutionary perspective on learning disability in mathematics. Developmental Neuropsychology, 32(1), 471-519.
  • Geary, D. C. (2006). Gender differences in mathematics: An integrative psychological approach, by A.M. Gallagher, J.C. Kaufman. British Journal of Educational Studies, 54(2), 245-246.
  • Geary, D. C. (1993). Mathematical disabilities: Cognitive, neuropsychological, and genetic components. Psychological Bulletin, 114(2), 345-362.
  • Geary, D. C. (2004). Mathematics and learning disabilities. Journal of Learning Disabilities, 37(1), 4-15.
  • Geary, D. C. (2005). Role of cognitive theory in the study of learning disability in mathematics. Journal of Learning Disabilities, 38(4), 305-307.
  • Geary, D. C., Hamson, C. O., & Hoard, M. K. (2000). Numerical and arithmetical cognition: A longitudinal study of process and concept deficits in children with learning disability. Journal of Experimental Child Psychology, 77(3), 236-263.
  • Geary, D. C., & Hoard, M. K. (2003). Learning disabilities in basic mathematics - Deficits in memory and cognition. J. M. RoyerMathematical Cognition (pp. 93-115). PO Box 4967/Greenwich/CT 06831/USA: Information Age Publishing.
  • Geary, D. C., Hoard, M. K., ByrdCraven, J., Nugent, L., & Numtee, C. (2007). Cognitive mechanisms underlying achievement deficits in children with mathematical learning disability. Child Development, 78(4), 1343-1359.
  • Geary, D. C., Hoard, M. K., & Hamson, C. O. (1999). Numerical and arithmetical cognition: Patterns of functions and deficits in children at risk for a mathematical disability. Journal of Experimental Child Psychology, 74(3), 213-239.
  • Geary, D. C., & Huffman, K. J. (2002). Brain and cognitive evolution: Forms of modularity and functions of mind. Psychological Bulletin, 128(5), 667-698.
  • Geary, D. C., Liu, F., Chen, G. P., Saults, S. J., & Hoard, M. K. (1999). Contributions of computational fluency to cross-national differences in arithmetical reasoning abilities. Journal of Educational Psychology, 91(4), 716-719.
  • Geary, D. C., Saults, S. J., Liu, F., & Hoard, M. K. (2000). Sex differences in spatial cognition, computational fluency, and arithmetical reasoning. Journal of Experimental Child Psychology, 77(4), 337-353.
  • Geary, D. C., & Widaman, K. F. (1992). Numerical cognition: On the convergence of componential and psychometric models. Intelligence, 16, 47-80.
  • Geary, D. C., Liu, F., Chen, G.-P., Saults, S. J., & Hoard, M. K. (1999). Contributions of Computational Fluency to Cross-National Differences in Arithmetical Reasoning Abilities. Journal of Educational Psychology, 91(4), 716-719.
  • Geary, D. C., & Widaman, K. F. (1992). Numerical cognition: On the convergence of componential and psychometric models. Intelligence, 16(1), 47-80.
  • Trull, T. J., & Geary, D. C. (1997). Comparison of the big-five factor structure across samples of Chinese and American adults. Journal of Personality Assessment, 69(2), 324-341.
  • Widaman, K. F., Gibbs, K. W., & Geary, D. C. (1987). Structure of adaptive behavior: I. Replication across fourteen samples of nonprofoundly mentally retarded people. American Journal of Mental Deficiency, 91(4), 348-360.

CHC intelligence theory tipping point: It has come

[Double click on image to enlarge]

In April 2005, upon returning from the annual NASP (National Association of School Psychologists) convention, I concluded (in a blog post) that sometime during the past 5 years the CHC intelligence theory "tipping point" had occurred, and the CHC intelligence test bandwagon had gathered full steam. Before reading further, I would recommend reading that original post for background information and important links (esp. the link to the historical information I've written about the evolution of CHC theory).

To satisfy my curiosity I decided to gather some informal data...namely, the tracking of select terms in the body of messages on the NASP listserv. I wanted to see if there was any change in the usage of CHC-related terms over time. So...what did I do?

I went to the NASP listserv and used a Yahoo Groups feature that allowed me to search the body of all archived messages for key terms. I did this for different years. The terms I searched where Gf-Gc (what CHC theory originally was referred to prior to the publication of the WJ III; see prior original post for important link to historical background information), CHC, and WJ (Woodcock-Johnson). At the top of this post is a graph of the results.

From the figure I've concluded that the CHC tipping point, at least within the NASP community, occurred sometime between 2001 and 2003. The publication of the WJ III in 2001 is important as it was the first intelligence battery organized as per CHC theory (note - the1989 WJ-R was organized as per Cattell-Horn Gf-Gc theory). [Read the previously referenced historical background information regarding the role of the WJ-R and WJ III in the infusion of Gf-Gc and CHC theory into applied intellectual assessment - click on my original post to find this info]. As one can see, their was a huge amount of discussion of the WJ III went it hit the streets....volume that has continued for a number of years.

What I find particularly interesting is the replacement of references to Gf-Gc by CHC starting in the same year....2001. Notice the increase in CHC references from 2001 thru 2003 with a concurrent decrease in the use of the terms Gf-Gc. I would conclude, largely based on my personal knowledge of the history of the origin of the term "CHC" [again, read the historical information I've provided], that the publication of the WJ III was the primary event(as well as the increasing interest in CHC-organized cross-battery assessments) that resulted in the infusion of CHC theory into school psychology, as evidenced by a change in the language used by school psychologists on their general purpose listserv.

Since 2003 there has been a general decrease in the use of the CHC in NASP listserv messages. Does this mean that the interest in the theory has peaked? I think not. I've data to support this conclusion.

The NASP listserv is a general purpose topic listserv. Intellectual assessment/theory topics are only a small part of the collective message threads. I would advance the hypothesis that CHC theory continues to increase in the communications of psychologists. Upon what do I base this observation? I base this conclusion on the membership figures for the special-purpose CHC listserv that I started.

If you click here you will see a graph of the cumulative membership of the CHC list, a list that I started in order to give folks interested in CHC theory/assessment issues a place to talk about them in-depth.....and to also save the NASP listserv from such focused discussions (as all members may not be interested). As you can see from the membership numbers of the CHC list, membership is growing at a nearly constant linear rate from 2003 to 2006 [note - current membership is at 956 and should reach 1000 relatively soon].

I conclude that the infusion of CHC theory into school psychology, which reached a tipping point sometime between 2001 and 2003, continues at a very steady rate, as evidenced by the increasing membership of the CHC list, as well as other objective indicators (namely, revision of other intelligence batteries to provide CHC interpretive frameworks....SB5, KABC-II, DAS-II...as well as continued interest in CHC-organized cross-battery assesment).

Comments, thoughts, disagreements, etc. are welcome. Either post them here via the "comment" feature or share at the CHC listserv.


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Thursday, October 18, 2007

WISC-IV web meta-search link posted

I've added my 2nd IQ's Corner web meta-search link to the appropriate section of this blog (scroll down left side of blog to the "Meta-web searches" section). The topic is the Wechsler Intelligence Scale for Children--Fourth Edition (WISC-IV). Why would I do this, given my authorship of the WISC-IV's major competitor (WJ III) and my strong support for CHC theory, which the WISC-IV is not formally grounded in?

Simple. Any post that mentions this instrument generates traffic to my site...and the more people that come and "find a home" at IQ's Corner....the greater the chances more professionals will learn and improve their intelligence assessment practices.

Stay tunned. Other tests, concepts, ideas, topics, etc. will be similarly searched and added to the Meta-web search section (and routinely updated as needed) on a regular basis. Check back frequently.


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Wednesday, October 17, 2007

Executive functions highly genetic?

Thanks to Chris C at DI blog for the very interesting post about a new study that suggests that executive functions may have a strong genetic (heritable) component.

Blame your bad planning and impulse control on your parents ? Hmmmmmmmmmmm


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Psychology book nook reviews 10-17-07


A new issue of PsycCRITIQUES is available online.



October 17, 2007
Volume 52, Issue 42


Book Reviews
1. The Scope of Social Psychology: Theory and Applications
Authors: Miles Hewstone, Henk A. W. Schut, John B. F. De Wit, Kees van den Bos, and Margaret S. Stroebe (Eds.)
Reviewer: Luciano L'Abate

2. Evolutionary Perspectives on Environmental Problems
Authors: Dustin J. Penn and Iver Mysterud (Eds.)
Reviewer: Harry Heft

3. Co-Occurring Substance Abuse and Mental Disorders: A Practitioner's Guide
Author: John Smith
Reviewers: Alejandra Suarez and Douglas M. Kerr

4. Psychotropic Drug Prescriber's Survival Guide: Ethical Mental Health Treatment in the Age of Big Pharma
Authors: Steven L. Dubovsky and Amelia N. Dubovsky
Reviewer: Lisa J. Cohen

5. Overcoming Pathological Gambling: Therapist Guide
Authors: Robert Ladouceur and Stella Lachance
Reviewers: Mark S. Gold and Christopher J. Hammond

Overcoming Your Pathological Gambling: Workbook
Authors: Robert Ladouceur and Stella Lachance
Reviewers: Mark S. Gold and Christopher J. Hammond

6. The Dream Experience: A Systematic Exploration
Author: Milton Kramer
Reviewers: Mike Knight and James Vaughn

7. Buried in Treasures: Help for Compulsive Acquiring, Saving, and Hoarding
Authors: David F. Tolin, Randy O. Frost, and Gail Steketee
Reviewer: Susan H. Houston

8. Gay Conservatives: Group Consciousness and Assimilation
Author: Kenneth W. Cimino
Reviewer: Edward J. Tejirian

9. New Developments in Autism: The Future Is Today
Authors: Juan Martos Pérez, Pedro M. González, María Llorente Comí, and Carmen Nieto (Eds.)
Reviewer: Donald P. Oswald

10. The New Rational Therapy: Thinking Your Way to Serenity, Success, and Profound Happiness
Author: Elliot D. Cohen
Reviewer: Sara Dettinger Martino

11. Race, Gender, and Punishment: From Colonialism to the War on Terror
Authors: Mary Bosworth and Jeanne Flavin (Eds.)
Reviewer: Jesus (Jesse) Aros

12. The Methamphetamine Crisis: Strategies to Save Addicts, Families, and Communities
Author: Herbert C. Covey (Ed.)
Reviewer: Itai Danovitch

13. Communication Technology and Social Change: Theory and Implications
Authors: Carolyn A. Lin and David J. Atkin (Eds.)
Reviewer: Moshe Landsman

14. Psychotic Symptoms in Children and Adolescents: Assessment, Differential Diagnosis, and Treatment
Author: Claudio Cepeda
Reviewer: Timothy A. Sisemore

15. Primal Healing: Access the Incredible Power of Feelings to Improve Your Health
Author: Arthur Janov
Reviewer: Cindy Ycaza Stroschein

16. Acceleration for Gifted Learners, K–5
Authors: Joan Franklin Smutny, Sally Y. Walker, and Elizabeth A. Meckstroth
Reviewer: Janice E. Jones

Video Review
17. Integrative Family Therapy
with Jay Lebow
Reviewers: David S. Hargrove and Elizabeth M. Malone

Film Review
18. The Departed
Director: Martin Scorsese
Reviewer: Stephen P. Hampe