Higher neural functions Language areas

Higher neural functions Language areas - Amnesia Forgetting...

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Higher neural functions Language areas Broca’s area: Assembly of strings of words into sentences o Executive/motor area o o Receptive/formulation area o Comprehension 2 types of language deficit o Aphasia: Inability to use language o Aprosodia: Inability to infer emotional emphasis Broca’s dysphasia: Expressive (BROCA = BROKEN speech) o Non-fluent; Reading & repetition abnormal; Preserved comprehension o Associated signs: Right Hemiparesis; Right Hemisensory loss Wernicke’s dysphasia: Receptive (WERNICKE = WORDY speech) o Fluent, excessive speech; Reading aloud & repetition impaired; Poor comprehension o Associated signs: Right Hemianopia (uncommon) Global dysphasia: Non-fluent o o Conduction aphasia: Fluent, but paraphasic o Comprehension intact; Repetition severely impaired o
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Unformatted text preview: Amnesia Forgetting is a normal process, but amnesia may be indicative of underlying pathological changed • Often follows head injury; Can indicate severity of brain trauma • May occur as • Anterograde: Inability to form new memories o Fault in the consolidation of new experience into long-term memory o Defect often associated with damage to temporal lobes, esp. hippocampal gyrus • Retrograde: Inability to recall events prior to a precipitating event o Failure of long-term memory o Such memories distributed throughout cerebral cortex, so generalised lesions may cause retrograde amnesia (e.g. in Alzheimer’s disease) • Post-traumatic amnesia o Inc. degree of retrograde & anterograde amnesia o May correlate with degree of head injury • Longevity of anterograde amnesia may be useful diagnostically following trauma • Retrograde amnesia may reflect more serious underlying damage...
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This note was uploaded on 12/04/2011 for the course ANTHRO 2000 taught by Professor Monicaoyola during the Fall '10 term at Broward College.

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Higher neural functions Language areas - Amnesia Forgetting...

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