Nowresearchers studyingchickens have not only confirmedthis but alsofoundotherchanges brought on by farming. Inparticular, the dumbness would appear to be aggravated by stress.
My post from yesterday on the staggering dumbness of so much of the how-to content produced by Demand Media generated a lot of response, much of it positive, but some from readers who thought I was unfair.