%A Nicholas Humphrey %J Psycoloquy %T Why Grandmothers May Need Large Brains. (Commentary on Skoyles on Brain Expertise) %X 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. %N 024 %K brain size, evolution of intelligence, human life history, social intelligence hypothesis, human evolution %P 1-3 %V 10 %D 1999 %L cogprints848