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Tests of Cerebral lateralization

Tests of Cerebral lateralization. Lesions Sodium amytal test Dichotic listening test Functional brain imaging Split brain. Theories of Cerebral Asymmetry. Analytic-Synthetic theory Motor theory Linguistic theory. Broca’s Aphasia. Impaired language production

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Tests of Cerebral lateralization

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  1. Tests of Cerebral lateralization • Lesions • Sodium amytal test • Dichotic listening test • Functional brain imaging • Split brain

  2. Theories of Cerebral Asymmetry • Analytic-Synthetic theory • Motor theory • Linguistic theory

  3. Broca’s Aphasia • Impaired language production • Overall language comprehension was not a problem UNLESS the meaning depended on prepositions, and other grammatical devices • Some production difficulties • “To be or not to be” • Two bee oar knot two bee

  4. Wernicke’s Aphasia • Difficulties with nouns and verbs • Trouble with language comprehension • “Word Salad”

  5. Summary • Broca’s aphasia • More trouble with production of language • Problems with prepositions, conjuctions and pronouns • Wernicke’s aphasia • More trouble with comprehension • Problems remembering and knowing nouns and verbs.

  6. Conduction Aphasia • Arcuate fasciculus • Conveys information about the sounds of words, but not their meaning • Poor repetition of unfamiliar words

  7. Wernicke-Geschwind • Conversation • Auditory signal to primary cortex • Primary cortex to Wernicke’s area • Wernicke’s area to Broca’s area (via arcuate fasiculus) • Broca’s area to primary motor cortex • Primary motor cortex to vocalizaton

  8. Wernicke-Geschwind • Reading aloud • Primary visual cortex to left angular gyrus • Left angular gyrus to Wernicke’s area • Wernicke’s area to Broca’s area (via arcuate fasiculus) • Broca’s area to primary motor cortex • Primary motor cortex to vocalizaton

  9. Dyslexia • Developmental dyslexia • Planum temporale • Acquired dyslexia • Lexical procedure and phonetic procedure • Surface dyslexia • Deep dyslexia • Word-form spelling • Direct • Alexia

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