By Kim B. M.
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Extra info for 2-Universal Positive Definite Integral Quinary Diagonal Quadratic Forms
D In mice, however, both hemispheres can tual groupings that the left could not. Thus, consistently perceive these differences. while both hemispheres in a split-brain perFor a rodent to perform better than we son can judge whether the illusory rectangles do suggests that some capabilities were are fat or thin when no line is drawn around lost from one hemisphere or the other as the openings of the “Pacman” figures, only the human brain evolved. G. race for space. at left]. This setup is called the amodal version of the test.
Bogen, P. J. Vogel and I witnessed what happened still “talk” to each other and what role any such communicawhen the left and the right hemispheres were unable to com- tion played in thought and action. There are several bridges municate with each other. of neurons, called commissures, that connect the hemispheres. It became clear that visual information no longer moved be- The corpus callosum is the most massive of these and typicaltween the two sides. If we projected an image to the right vi- ly the only one severed during surgery for epilepsy.
Seen in the human brain was an evolutionary add-on—mechThe answer may be that the left hemisphere seeks explanaanisms or abilities that were laid down in one hemisphere tions for why events occur. The advantage of such a system is only. We recently stumbled across an amazing hemispheric dis- obvious. By going beyond the simple observation of events and sociation that challenges this view. It forced us to speculate that asking why they happened, a brain can cope with these same some lateralized phenomena may arise from a hemisphere’s events better, should they happen again.