When does excitatory post synaptic potential happen? When does inhibitory post synaptic potential occur? Why are Axons covered by a myelin sheath?

Name: PSYC 4100 Week 2 Class Notes
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Splitting the corpus callosum: a guy had seizures from connections going across the corpus callosum from one side of the brain to the other, so they split his corpus callosum meaning they split the two hemispheres of his brain. The two sides of the brain cannot communicate with each other - everything shown in the left visual ﬁeld goes to the right side of the brain and vice versa. Words ﬂashed on the right side are processed by the left side (the left side contains the language area) so he can process the word and thus say the word. If the word is ﬂashed on the left side he wont be able to process it/ say the word because the right side of the brain does not control language, but he would be able to draw the object of whatever the word wa