Hi Looks like the specific results for caudate are even weaker than Chris has suggested. Here’s the closing paragraph.
This study provides the first report of a positive associa- tion between bilateral caudate volume and IQ, in three large, independent, nonclinical adult samples. Constraining the effect of caudate volume to be equal across all three sam- ples produced a well-fitting model and suggested that cau- date volume accounts for somewhere between 2.4% and 4.3% of variance in IQ. Due to the fact that the present analy- ses are purely correlational, determining the specific mecha- nisms that account for the association between intelligence and caudate volume is an important goal of future research. And of course there is that closing line, acknowledging the gap between correlation and mechanism. Take care Jim Jim Clark Professor & Chair of Psychology University of Winnipeg 204-786-9757 Room 4L41 (4th Floor Lockhart) www.uwinnipeg.ca/~clark<http://www.uwinnipeg.ca/~clark> From: Christopher Green [mailto:[email protected]] Sent: Sunday, January 03, 2016 10:15 AM To: Teaching in the Psychological Sciences (TIPS) Subject: [tips] Subcortical intelligence: caudate volume predicts IQ in healthy adults. - PubMed - NCBI This article has been getting a lot media play over the past couple of days (which is interesting in itself, since it was published back in April). It strikes me, however, as a classic example of paying way too much attention to p-values and not enough to effect sizes. Yes, the effects are significant (mostly), but if you look at the full article, it appears that the R-squares range from .11 downwards. Not exactly a Eureka! moment. http://www.ncbi.nlm.nih.gov/pubmed/25491047?utm_content=buffer077fa&utm_medium=social&utm_source=twitter.com&utm_campaign=buffer Chris ....... Christopher D Green Department of Psychology York University Toronto, ON M3J 1P3 43.773759, -79.503722 [email protected]<mailto:[email protected]> http://www.yorku.ca/christo --- You are currently subscribed to tips as: [email protected]<mailto:[email protected]>. To unsubscribe click here: http://fsulist.frostburg.edu/u?id=13251.645f86b5cec4da0a56ffea7a891720c9&n=T&l=tips&o=47730 (It may be necessary to cut and paste the above URL if the line is broken) or send a blank email to leave-47730-13251.645f86b5cec4da0a56ffea7a89172...@fsulist.frostburg.edu<mailto:leave-47730-13251.645f86b5cec4da0a56ffea7a89172...@fsulist.frostburg.edu> --- You are currently subscribed to tips as: [email protected]. To unsubscribe click here: http://fsulist.frostburg.edu/u?id=13090.68da6e6e5325aa33287ff385b70df5d5&n=T&l=tips&o=47731 or send a blank email to leave-47731-13090.68da6e6e5325aa33287ff385b70df...@fsulist.frostburg.edu
