2002-08-12Z2011-03-11T08:54:20Zhttp://cogprints.org/id/eprint/848This item is in the repository with the URL: http://cogprints.org/id/eprint/8482002-08-12ZWhy Grandmothers May Need Large Brains. (Commentary on Skoyles on Brain Expertise)Skoyles's case against human brain size being related to IQ is strong; but his case in favor of its being related to expertise is weak. I propose that the explanation for the evolutionary expansion of the human brain in fact lies far away, in the need to have a brain that could continue to function into old age.Nicholas Humphrey