tag:blogger.com,1999:blog-11327954.post804769672346238229..comments2023-10-01T06:53:25.728-07:00Comments on IQ's Corner: More on spatial visualization rotation abilities (Gv-Vz)Kevin McGrewhttp://www.blogger.com/profile/07945625852793502565noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-11327954.post-46173821630397033042007-06-03T15:26:00.000-07:002007-06-03T15:26:00.000-07:00Bob. Yes.....I've been very aware of the Johnson ...Bob. Yes.....I've been very aware of the Johnson and Bouchard writings over the past year or so and their emphasis on mental rotation. I've been meaning to write something about their articles....but have never found sufficient time....as I really need to read and study their material in depths before making any commments.<BR/><BR/>My first blush reaction has been that although their model may fit their data the best, they are only working with a select number of databases. Carroll's massive work spans hundreds of datasets. Yes...Johnson and Bouchard are working with large samples, but my knee jerk reaction is one should not immediately endorse their VPR model until it is replicated by others in many other data sets. But again, these are just my knee jerk reactions based on a quick skim of their articles.Kevin McGrewhttps://www.blogger.com/profile/07945625852793502565noreply@blogger.comtag:blogger.com,1999:blog-11327954.post-68474625287322987742007-06-02T11:37:00.000-07:002007-06-02T11:37:00.000-07:00For the past two years, there have been numerous p...For the past two years, there have been numerous papers from Bouchard and Johnson on the subject of their VPR model, which is strongly focused on rotation as one of the three factors that model produces as the final set of group factors. Among the papers that have appeared:<BR/><BR/><BR/><BR/>Constructive replication of the visual–perceptual-image rotation model in Thurstone's (1941) battery of 60 tests of mental ability<BR/><BR/>Intelligence, Volume 33, Issue 4, July-August 2005, Pages 417-430<BR/><BR/>Wendy Johnson and Jr., Thomas J. Bouchard<BR/><BR/><BR/><BR/>The structure of human intelligence: It is verbal, perceptual, and image rotation (VPR), not fluid and crystallized<BR/><BR/>Intelligence, Volume 33, Issue 4, July-August 2005, Pages 393-416<BR/><BR/>Wendy Johnson and Jr., Thomas J. Bouchard<BR/><BR/><BR/><BR/>Replication of the hierarchical visual-perceptual-image rotation model in de Wolff and Buiten's (1963) battery of 46 tests of mental ability<BR/><BR/>Intelligence, Volume 35, Issue 1, January-February 2007, Pages 69-81<BR/><BR/>Wendy Johnson, Jan te Nijenhuis and Jr., Thomas J. Bouchard<BR/><BR/><BR/><BR/>I was particularly interested in what appears to me to be a contrast between the VPR model and the C-H-C model used in WJ3. Although I have not discussed these differences with Bouchard, but I have done so at some length with Johnson. At this point, it is my conclusion that neither approach is right or wrong on the basis of the other and I am now less bothered by what initially appeared to be a conflict. Johnson/Bouchard argue that the VPR model presents a better fit to the data they have examined than other models. It is somewhat unsettling that the various VPR papers have come from the same source and have not yet spawned confirmation or dispute from other researchers.<BR/><BR/><BR/><BR/>Perhaps the most important outcome of Wendy's focus on the VPR model is that it recognizes the importance of the R component. Otherwise there may or may not remain a disagreement among researchers with respect to the distinction between crystallized and fluid intelligence. If Gc is taken to be a specific way of measuring Gf, the objections from Johnson either vanish or become less of an issue; but if Gc and Gf are taken to be separate entities, there is a conflict. Jensen once pointed out that a sufficiently large number of Gc test items would yield a pure (presumably he did not mean "perfect") measurement of g.<BR/><BR/><BR/><BR/>BobWManfredhttps://www.blogger.com/profile/17252971247678089823noreply@blogger.com