L8" HEMISPHERIC SPECIALISATION AND LANGUAGE Flashcards

(10 cards)

1
Q

how are the cerebral hemispheres connected?

A

bundled axons forming the corpus callosum

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2
Q

what is the divided visual field?

A

the visual pathway from the eye to the cerebral cortex via lateral geniculate nucleus of the thalamus

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3
Q

describe the visual pathway when looking ahead

A
  • things visible on the left are analysed in the right visual cortex and vice versa
  • stimuli presented in the left visual field give rise to signals sent to the right hemisphere
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4
Q

describe how the split brain gives evidence for hemispheric specialisation for language

A
  • signals cannot cross between hemispheres
  • stimuli processed by the left hemisphere (right of fixation) could be verbally reported but stimuli processed by the right cannot (but can draw)
  • right hemisphere unable to generate speech
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5
Q

describe how the block design task gives evidence for hemispheric specialisation for visuospatial problem solving

A

recreating a picture from a set of blocks is easy with the left hand (right hemisphere) but not with right hand

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6
Q

describe how a hemisphere is deactivated to give evidence for hemispheric specialisation & lateralisation of language function

A
  • wada test
  • sodium amytal injected into carotid arteries
  • give patient an object, wake up and ask what it was
  • unable to verbally report
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7
Q

which hemisphere contains fundamental language components

A

left

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8
Q

where is Broca’s area?

A

inferior frontal lobe

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9
Q

what is affected by Broca’s aphasia?

A

language production

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10
Q

symptoms of Broca’s aphasia

A
  • slow, laboured speech output
  • anomia - failure to remember names of things
  • paraphasic errors - substituting incorrect speech sounds
  • telegraphic speech
  • repetition
  • agrammatism - difficulty with grammatic utterances eg passive voice
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