PSYCH261 Lecture : Biological Psychology 10th Edition Chapter 14
16 Oct 2011
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Splitting the corpus callosum leads to separate minds". In human brain: left hemisphere has different functions from right. Skin receptors and muscles are connected to contralateral cerebral cortex (as are eyes, ears) Ipsilateral control for taste, smell; trunk and face is controlled by both hemispheres. Info of both sides are shared via the corpus callosum. Visual field: right half shines to left side of both retinas and sends info to left hemisphere. Half of axons at each eye cross to the opposite side at the optic chiasm. Auditory system: ears send to both sides (for localization) When ears receive different info focus becomes contralateral. Originally a treatment for epilepsy; cut the focus so the seizure affects only half the body. Lead to less frequent seizures but patients became split-brained. Split-brain people: can plan 2 actions at once, but can"t combine visual info seen at opposite sides. Left hemisphere: use for speech production (80-95% greater than right)
