Research Alert: Generational IQ: Quasilongitudinal insights from the Wechsler Adult Intelligence Scale, Fifth Edition.

Quick email FYI research alert.  Not an open access downloadable article.  😕

 

Generational IQ: Quasilongitudinal insights from the Wechsler Adult Intelligence Scale, Fifth Edition. 
https://psycnet.apa.org/record/2027-87746-001

Pardon typos and spelling errors-Message may be sent from iPhone and I've always had spelling problems :)

*****************************************
Kevin S. McGrew, PhD
Educational & School Psychologist
Director
Institute for Applied Psychometrics (IAP)
https://www.themindhub.com
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Research Alert: Specific (CHC) cognitive abilities are highly heritable independent of general intelligence (g)

This sound and important article includes a link to the original 2022 article in Intelligence (open access) and also a brief video summary of the study. 

 

Specific cognitive abilities are highly heritable independent of general intelligence 
https://www.psypost.org/specific-cognitive-abilities-are-highly-heritable-independent-of-general-intelli/

Research Alert: Looking into working memory through micro eye movements—“mind leaks” via the eyes

Quick email-based FYI research alert.

Click on image to enlarge for easy viewing.

 

Interesting article on how the study of small eye movements during activity working memory task performance can shed light on possible mental processes…..I like the concept of “mind leaks” via eye movements.  Good news….this is an open access article available at link below👍

 

Looking into working memory through micro eye movements: Trends in Cognitive Sciences 
https://www.cell.com/trends/cognitive-sciences/fulltext/S1364-6613(26)00128-2

Pardon typos and spelling errors-Message may be sent from iPhone and I've always had spelling problems :)

*****************************************
Kevin S. McGrew, PhD
Educational & School Psychologist
Director
Institute for Applied Psychometrics (IAP)
https://www.themindhub.com
******************************************

Research Alert: Combining Psychology With Artificial Intelligence: What Could Possibly Go Wrong?

Quick email-based Research Alert FYI.  This is an open access article👍

 

Combining Psychology With Artificial Intelligence: What Could Possibly Go Wrong? - Iris van Rooij, Olivia Guest, 2026 
https://journals.sagepub.com/doi/10.1177/09637214261438379

 

Abstract

The current AI hype cycle combined with psychology’s various crises make for a perfect storm. Psychology, on the one hand, has a history of weak theoretical foundations, a neglect for computational and formal skills, and a hyperempiricist privileging of experimental tasks and testing for effects. Artificial intelligence, on the other hand, has a history of conflating artifacts for theories of cognition, or even minds themselves, and its engineering offspring likes to move fast and break things. Many of our contemporaries now want to combine the worst of these two worlds. What could possibly go wrong? Quite a lot. Does this mean that psychology and artificial intelligence can best part ways? Not at all. There are very fruitful ways in which the two disciplines can interact and theoretically contribute to cognitive science, for instance, by studying the scope and limits of computational models of human cognition. But to reap the fruits, one needs to understand how to steer clear of potential traps.

Click on images to enlarge

AI Brief: The ascent of individual variance in education—the increasing importance of individual differences

This is another IQs Corner AI Brief.  

Prepared by Dr. Kevin McGrew with major assist from Google NotebookLM.  (Click here for brief explanation of how IQs Corner creates AI Briefs from article PDFs).  

For the first time I’m also experimenting with the Google NotebookLM feature of creating an AI generated infographic (Beta) from the research article—click on the image to enlarge for easy viewing.

The Ascent of Individual Variance in Global Education

 

The article "The growing role of individual differences: A cross-National Study of achievement variance reallocation from grade 4 to 8," published in the journal Intelligence (Eriksson et al., 2026; click here to acquire open access PDF copy), explores how the determinants of student achievement shift as children transition from late childhood (approximately age 10) to early adolescence (approximately age 14). The researchers, led by Kimmo Eriksson, sought to determine whether environmental factors, such as the quality of a national school system, become more influential over time through compounding advantages, or if individual learning characteristics grow in importance as academic material becomes more complex.

 

Theoretical Framework

 

The study tested three competing theoretical perspectives on achievement development between Grade 4 and Grade 8:

• Skills-Beget-Skills: Suggests early academic advantages create cascading benefits, predicting that high-quality national systems should lead to compounding advantages and an increase in the proportion of variance attributable to countries.
• Opportunity-to-Learn (OTL): Emphasizes exposure to content and predicts that variance at the school and class levels should increase as curricula become more specialized and students are sorted into different tracks.
• Individual Differences + Institutional Response: The authors’ integrated framework proposes that developmental processes create new individual-level variance, while educational systems respond by sorting students into different classes (tracking/streaming), thereby reallocating that variance to the class level.

Methodology

 

The researchers utilized data from the Trends in International Mathematics and Science Study (TIMSS) across three cohorts (2011–2015, 2015–2019, and 2019–2023). Their analysis involved dozens of countries and two primary methods:

1. Systematic Variance Decomposition: A four-level partition of achievement variance across countries, schools within countries, classes within schools, and individual students.
2. Cross-National Analysis: A formal model examining the relationship between individual characteristics (proxied by within-country relative standing) and educational system quality (proxied by country mean achievement).

Key Findings

 

The results across all cohorts and both subjects (mathematics and science) consistently supported the Individual Differences + Institutional Response hypothesis (H3) and directly contradicted the Skills-Beget-Skills hypothesis.

• Decrease in Country Influence: The proportion of achievement variance attributable to the country level decreased substantially (by 4–11 percentage points) as students moved from Grade 4 to Grade 8.
• Increase in Class-Level Importance: The proportion of variance at the class level increased substantially (by 3–7 percentage points). The class level was unique in benefiting from both the creation of new variance (through differentiated instruction) and the movement of variance (through ability-based sorting).
• Compensatory Advantage: The cross-national analysis revealed that the "slope" relating individual characteristics to system quality was shallower in Grade 8 than in Grade 4. This means that while students in weaker systems need higher individual characteristics to reach a certain achievement level (e.g., 500 points), this compensatory requirement is smaller in Grade 8, indicating that individual traits are increasingly pulling students ahead regardless of their national system's quality.

Conclusions and Implications

 

The authors conclude that stable individual characteristics affecting learning capacity—such as cognitive abilities, motivation, and self-regulation—become more influential as students mature. These traits are further magnified through interaction with educational environments, such as the "Matthew effect," where high-performing students elicit more challenging opportunities and resources. For educational practice, these findings suggest that pedagogical strategies may need to accommodate a wider range of learning profiles as students progress through school. Furthermore, the study cautions researchers that interventions targeting specific early skills may experience "fadeout" if they do not address the underlying learning capacities that become increasingly determinative during adolescence.

 

Research Alert: Generation Intelligence (Gen I): A Five-Intelligence Framework for Understanding Generational Cognitive, Emotional, Social, Spiritual, and AI Readiness Profiles

Interesting food for thought.

PDF copy of article available here at Research Gate.

Abstract

Standard generational analysis focuses on birth-year cohorts and broad demographic patterns. This paper introduces Generation Intelligence (Gen I), a multidimensional framework that refocuses the analytical lens on the formative window of ages 8 to 12, the period of peak neuroplasticity, social identity formation, and communication technology imprinting. Across six living generations (Silent, Baby Boomer, Generation X, Millennial, Generation Z, and Generation Alpha), the framework applies five intelligence dimensions, Cognitive Intelligence (IQ), Emotional Intelligence (EQ), Social Intelligence (SQ), Spiritual Intelligence (SpQ), and AI Readiness (AQ),to produce a generational intelligence matrix. The framework synthesizes established developmental psychology, the Strauss-Howe generational cycle theory, and Pew Research Center longitudinal data with emerging research on digital media's cognitive effects and AI's developmental implications. Findings suggest that each generation's distinctive intelligence profile is predictable from its formative communication environment, and that the full intelligence spectrum, not any single generation's contribution alone, is required to address the complex challenges of the 21st century. Practical implications for education, organizational leadership, human development practice, and AI governance are discussed.

Keywords: generational intelligence, emotional intelligence, spiritual intelligence, AI readiness,  formative development, neuroplasticity, intergenerational leadership, Gen I.

Click on image to enlarge for easy reading

Research Alert: Deary on Construct validity and intelligence differences: The murder board, the magic number, and the breadcrumb trail

Quick FYI email research alert post:  This is open access article.👍

 

Construct validity and intelligence differences: The murder board, the magic number, and the breadcrumb trail - ScienceDirect 
https://www.sciencedirect.com/science/article/pii/S0160289626000279?ref=cra_js_challenge&fr=RR-1

 

Abstract

In this piece there is a resume of some of the most-cited (though maybe less-than-closely-read) articles on construct validity, and a rediscovery that they articulate it in various ways, including destroying it. That moves on to considering: whether ideas about construct validity are different from/part of the philosophy of science; whether scientists generally and those, more specifically, working in intelligence, acquaint themselves with these ideas and guide their practice from having done so (and whether it matters if they don't); and whether the relationship between writers about construct validity/philosophy of science and empirical researchers is bite or bark (aka fire or smoke). Then, with attention to the construct/idea/field of individual differences in intelligence, there is an as-honest-as-introspection-affords account of what intelligence is like in this researcher's head: thus, the murder board, the magic number, and the breadcrumb trail. Conclusion: whereas intelligence test scores continue to accrue their impressive empirical regularities and its bio-, psycho-, and social- origins prove hard to divine, and whereas there will continue to be writings about construct validity, maybe most researchers in the field will continue to have their bespoke and more-or-less well-researched and -applied guardrails against bad science.

 

Select quotes:

 

“This preamble is by way of introducing that I thought it might be useful to try to put down how I represent—after more than 40 years of working on it—the construct validity of intelligence in my head. It's an idiographic approach, but it is intended to be an everyman account of the working- day utility that construct validity provides, including any personal wonkiness, vagueness, and inaccuracies.”

 

“The best metaphor I have been able to think of for how intelligence- differences-research-is-represented-in-my-brain is the murder board that one sees in TV detective programmes—the rather corny board with photos and post-it notes and other scraps of paper and writing, linked with bits of red tape secured with pins. The metaphor is just a way of representing the kinds of evidence that, to date, have accrued about and afford interpretations of cognitive test scores. The missing centre of the murder board is the culprit, though it might have suspects. With intelligence's murder board, we might have a holding note at the centre of the board with ‘intelligence' written on it. But, don't be fooled, that does not mean it is a thing, like the DNA molecule. Rather, it is a holding term for the load of stuff that surrounds it. For now, let's assume that that note called intelligence means the total score from a diverse battery of cognitive tests that were administered in a standardised way. It's that score, without assumptions about it (some will be thinking that there are always assumptions). The stuff that surrounds the ‘intelligence test score' note at the centre of the board records the empirical regularities found in relation to those scores. We might form a circle round it with notes that summarise phenotypic information; listing just a few examples, we would note the discovery and replication that cognitive tests tend to correlate positively (Carroll, 1993), that different batteries of cognitive tests afford a general cognitive component/factor that ranks people similarly (Johnson et al., 2008), that intelligence has high test- retest reliability and high longitudinal stability (Deary, 2014), that there are well-replicated ageing patterns (which tell us that there is a useful distinction between fluid and crystallised intelligence) (T. A. Salthouse, 2009), and so forth. It's been said many times before, but it's worth stating that intelligence (cognitive test scores) arguably enjoys more and more-robust empirical regularities than maybe anything else in psychology. At the centre of the board, then, we have haloes of well-replicated empirical regularities that surround test scores on diverse types of cognitive capability. Intelligence is a holding term for this (the suspect).”

 

 

Pardon typos and spelling errors-Message may be sent from iPhone and I've always had spelling problems :)

Research Alert: Comparative Analysis of #Dyslexia Laws by State: A Review and Case Study

Quick FYI email-based post.  Sorry…this is not an open access paper😕

 

Comparative Analysis of Dyslexia Laws by State: A Review and Case Study | Learning Disabilities: A Multidisciplinary Journal 
https://js.sagamorepub.com/index.php/ldmj/article/view/13093

 

Abstract

The current study provides an updated review of enacted dyslexia laws that includes specific implementation requirements for each state. Except Hawaii, all states and the District of Columbia now have a dyslexia law, and 41 states include a codified definition of dyslexia. Thirty-four state definitions specify that dyslexia is neurobiological in origin. There was considerable variability in key implementation requirements across states. Forty-four states mandate screening for dyslexia, and 37 states include intervention requirements. Regarding educator training, requirements for in-service training were more common than pre-service training. Given the ambiguity for implementation of dyslexia law requirements, a survey to gauge “dyslexia preparedness” was given to school psychologists in a specific state. Survey results suggested school psychologists generally perceived a lack of preparedness and insufficient training as major challenges for implementing dyslexia mandates. Implications for policy guidelines and broader school-level implementation of dyslexia mandates are discussed. 

Pardon typos and spelling errors-Message may be sent from iPhone and I've always had spelling problems :)

AI Brief: Aligning AI agents with developmentally appropriate CHC (select) cognitive domains—a thought provoking AI approach for school-age children and youth

 The source article is an arXiv open-access article available here.  I have no idea if it has undergone peer-review and is a pre-print or if it is working draft paper.  

Click on inserted images to enlarge for easier viewing.

Dr. Kevin McGrew with major assist from Google NotebookLM.  (Click here for brief explanation of how IQs Corner creates AI Alerts from article PDFs)

ChildAgentEval, a psychometrically grounded benchmark designed to evaluate how well artificial intelligence aligns with the cognitive development of children and youth. Inspired by the Wechsler Intelligence Scale for Children-IV four-factor CHC model (the study does not use actual WISC-IV items as per test security standards), this framework assesses multimodal AI agents across ten interactive subtests covering the CHC domains like working memory (Gwm), verbal abstraction and vocabulary (Gc), fluid-visual spatial reasoning (Gf/Gv), and processing speed (Gs).

The study reveals that standard prompting—simply asking an AI to "act like a child"—does not authentically replicate pediatric developmental cognition, as models often maintain adult-level reasoning. The authors introduced a skill-guided distillation strategy that applies data-driven filters to simulate age-appropriate cognitive constraints and limitations. While AI agents can successfully adapt their vocabulary, the research highlights significant challenges in mimicking human-like bottlenecks in perceptual processing and memory retention. 

ChildAgentEval is the first psychometrically grounded interactive benchmark designed to measure cognitive age alignment in multimodal large language model (MLLM) agents. The study addresses a critical gap in current AI development: while state-of-the-art agents excel at complex reasoning, they often do not scaffold learning within a child's Zone of Proximal Development, often using adult-level abstractions that exceed a young user's cognitive grasp. The authors advocate for a shift in AI development from maximizing raw capability to ensuring developmental appropriateness for young users (e.g., school-age children and youth)—a feature that is much needed if AI is to be used in with school-age children and youth. 

The ChildAgentEval Framework

Inspired by the Wechsler Intelligence Scale for Children (WISC-IV), the benchmark evaluates agents across ten interactive subtests mapped to four primary CHC cognitive factors:

• Crystallized Intelligence (Gc): Verbal abstraction and vocabulary.
• Fluid and Visual-Spatial Reasoning (Gf/Gv): Rule induction and spatial problem-solving.
• Working Memory (Gwm): Information retention and manipulation.
• Processing Speed (Gs): Quickness of visual scanning and timed execution.

Unlike static evaluations, ChildAgentEval utilizes a Playwright-driven browser environment where agents must perform physical actions like clicking and typing to solve tasks. The framework also implements clinical protocols such as reversal and discontinuation rules to ensure developmental validity.

Skill-Guided Distillation

A core contribution of the research is a data-driven skill distillation strategy that moves beyond simple "act like a child" prompts. By analyzing a multi-source corpus of real child and adolescent interactions (ages 6–17), the researchers developed cognitive profile vectors. These vectors are converted into executable constraints via five cognitive filter modules injected into the agent's prompt, memory, and reasoning layers:

1. Vocabulary Abstraction Filter: Limits academic concepts and controls syntactic complexity.
2. Working Memory Mask: Physically simulates shorter memory spans by injecting noise or restricting cross-page information.
3. Reasoning Budget Controller: Restricts the depth of multi-step logic.
4. Visual Reliance Module: Reproduces cognitive biases, such as being misled by physical arrangement illusions.
5. Social Perspective Filter: Restricts reasoning to age-appropriate viewpoints, such as first-person vs. institutional perspectives.

Key Findings and Experimental Results

The study evaluated several proprietary models (e.g., GPT-5.4, Gemini-3.1-Pro) and open-weight models (e.g., Qwen3.5-27B). The experiments revealed three major insights:

• Standard Prompting Fails: Merely asking an agent to "act younger" does not reliably change its underlying cognitive behavior; most models continue to maximize correctness regardless of the requested age.
• Skill Guidance Enables Alignment: In high-performing proprietary models, the distillation method successfully induced monotonic score trajectories, where performance expanded naturally as the target age increased—the results produced performances associated with developmental growth curves of cognitive abilities.
• Uneven Domain Alignment: While agents easily adapted their linguistic style (Gc), they struggled to authentically simulate human-like limits in working memory and perceptual reasoning. This "domain dissociation" suggests that MLLM architectures currently lack the structural developmental bottlenecks found in biological cognition.

Conclusion

The authors conclude that for sensitive applications like educational tutoring, technical correctness must be secondary to developmental appropriateness. ChildAgentEval establishes a new paradigm for AI safety and alignment, shifting the focus from maximizing raw capability to authentic cognitive simulation.

Breaking legal and research news: SCOTUS (US Supreme Court) decision re multiple IQ scores in intellectual disability (ID) death penalty case (Hamm v Smith) - A DIG decision upholding the lower court decision

Today SCOTUS ruled on the Hamm v Smith multiple IQ score Atkins intellectual disability (ID) case that was argued before SCOTUS last December. This important decision, with all concurring and dissenting opinions, is available here.  Interested parties should read all the opinions. 

All documents and the history of the case can be found in a prior IQs Corner post.  As noted in the prior lengthy post, APA submitted an Amicus brief that, based on the reading of some of the justices opinions, suggests it (together with a AAIDD Amicus Brief) played an important role in the decision.

Briefly, when SCOTUS dismisses the writ of certiorari as improvidently granted it means the justices recognized that they made a mistake in agreeing to hear the case and decided to dismiss it without issuing a ruling on the merits. In legal shorthand, this is often referred to as a "DIG" (Dismissed as Improvidently Granted). This typically happens after the Court has accepted the case, reviewed the briefs, and sometimes even heard oral arguments. 

In practice, this means that the lower court decision—which is consistent with APA’s Amicus brief—that argued that multiple IQ scores should be viewed holistically  augmented by clinical judgement—stands. This means Mr. Smith will not be executed and, more importantly, the ruling does not upset the status of prior Atkins case law.  Given the recent direction and flavor of SCOTUS, there was a fear that SCOTUS might render a formal decision that would set back prior SCOTUS Atkins ID decisions.  So, this is a win for maintaining the principles of clinical judgement, the opinions and standards established by the established medical communities (both APA’s, AAIDD), and the need for a holistic approach to the interpretation of multiple IQ scores together with adaptive behavior.

A reading of the concurring opinions indicates that APA’s brief, as well as several key APA and AAIDD ID-related publications referenced in their decisions, were influential in the decision.  Several of the dissenting opinions reveal some troubling thinking by several justices. 

As a potential conflict of interest (COI) notice, I (Dr. Kevin McGrew), together with Dr. Joel Schneider and Dr. Cecil Reynolds (as noted on page three the APA amicus brief), were consultants to APA in the drafting of that brief.

It should be noted that as a result of the work of APA Amicus brief working committee, a peer-reviewed paper outlining a psychometrically sound approach (developed by Dr. Joel Schneider) for integrating multiple IQ scores was started during the deliberations and was recently published (Schneider, Reynolds, McGrew & Salekin, 2026) after the oral argument's.  This issue will likely to be revisited in future state cases, with Schneider et al. (2026) now elevated to a scientifically sound multiple IQ composite score method.