Despite the explosive
growth in size and complexity
of the human
brain, the
pace of evolutionary change among the thousands
of genes expressed in
brain tissue has actually slowed since the split, millions
of years ago, between human and chimpanzee, an international research team reports in the December 26, 2006, issue
of the journal, PLOS Biology.
This finding is consistent with previous research, which has shown that CKCS possess a CCF parenchyma proportionately similar in volume to that
of a Labrador and a CCF volume similar to small breed dogs, suggesting that CCF
growth in CKCS is not keeping
pace with the
growth of brain parenchyma [18].