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The brain's complexity arises from its connectivity --this is highlighted by the disproportionate increase in white
 

Summary: The brain's complexity arises from its connectivity -- this
is highlighted by the disproportionate increase in white
mattervolumethroughoutprimateevolution1
.Thelargest
connective structure in the brain is the corpus callosum;
it consists of over 190 million axons that transfer infor-
mation between the two cerebral hemispheres2
(FIG. 1).
The corpus callosum contains homotopic and hetero-
topic interhemispheric connections. Although there has
been debate about whether the connections are primarily
excitatory (integrating information across hemispheres)
or inhibitory (allowing the hemispheres to inhibit each
other to maximize independent function)3
, they appear
to be primarily excitatory, and this is the focus of most
research on interhemispheric transfer (IHT).
Corpus callosum function in humans was first inves-
tigated in classic studies of `split-brain' patients, whose
callosum is severed surgically for the treatment of epi-

  

Source: Adolphs, Ralph - Psychology and Neuroscience, California Institute of Technology

 

Collections: Biology and Medicine