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Psychology (9,697)
PSYB65H3 (479)
Ted Petit (185)
Chapter 4

Chapter 4: Laterality

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Ted Petit

Chapter 4 Lateralityo Laterality functional specialization of right and left hemisphereso Left hemisphere specialized for language and control of right hand and fingers o Right hemisphere believed to have role in visual identification of objects music emotion spatial abilities and control of left hand and fingersHarder to determine with no linguistic or right hand motor skill when LH is damaged o There is constant communication between the two sides o Both work together to interpret ex Words and prosody Module 41 Methods Split Brain o Both sides connected by commissures anterior posterior corpus callosum habenular commissure and hippocampal formation o CatsSevered commissural systemsWhen left eye trained to specific stimulus right eye doesnt exhibit recognition of stimulus and has to be trained separately o Epilepsy commissures transmit information back and forth increasing it o Severed corpus callosum both sides of the brain cannot communicate with each otherWith these patients discovered than RH comprehends spoken and written wordsunable to speak or write is capable of arranging letters to spell 3 or 4 letter words is specialized for recognition of faces used chimeric faces Intracarotid Amobarbital Testing o Aka Wada test o Used to assess the laterality of language in people who are going to be having brain surgery Goal is to assess expressive and receptive language ability and long term and short term memory capabilities of two hemispheres independent of each othero Anaesthetize hemisphere with injection to the same side keeps contralateral arm in the air and when functioning is gone the arm dropsThen assess cognitive functioning of patient o Have shown that most people show LH dominance for speech though some show bilateral have some type of interference with different language functions or RH in left handers Review Sensory Systems Visual System o Left Visual field from nasal hemiretina of left eye and temporal hemiretina of right eye both are sent to right side of the brain o Right Visual field opposite of above o There is overlap however such that center of retina fovea is sent to both sides only periphery is only on one side o Therefore stimulus must be presented on outside and very briefly so you dont move eyes Auditory System o All receptors send projections bilaterallyinfo from one ear is sent to both hemispheres
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