PSYC 2P25 Lecture Notes - Lecture 10: Intelligence Quotient, Magnetic Resonance Imaging, Smart People
4 Apr 2016
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Measure a variety of mental abilities report scores for overall iq (which mainly reflects g)and for parts of the test (each of which corresponds to a group factor) Iq scores usually have mean of 100 and sd of 15 (calculate for a group) Iq f(cid:396)o(cid:373) i(cid:374)tellige(cid:374)(cid:272)e (cid:395)uotie(cid:374)t used to (cid:271)e (cid:272)al(cid:272)ulated as (cid:862)(cid:373)e(cid:374)tal age(cid:863) di(cid:448)ided (cid:271)y (cid:272)h(cid:396)o(cid:374)ologi(cid:272)al age. Do smarter people have larger brains? indirect evidence: head circumference has oldest link with iq (r~. 20) but head circumference gives only a rough estimate of brain volume. Brain volume measured by mri scan gives r=. 33 on average iq. Mcdaniel 2005 completed 37 studies where n>1500 so, higher iq is (moderately) related to larger brain volume. Potential reasons for relation between iq and brain volume: Brain size as a result of high iq? (unlikely) Note about recent mri work on brain structure and iq (penke et al. , 2012)
