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16 Cards in this Set
- Front
- Back
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why do right and left hemispheres process info differently?
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1) somatosensory systems are crossed
2)some functions are primarily organized in one hemisphere |
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function of corpus callosum
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communicates information between each hemisphere
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structure of callosum
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purely axons with large amount of myeline
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receptive fields
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in higher cortical sensory areas the ipsilateral side is also represented
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types of pathways
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homotopic
hetertopic ipsilateral |
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homotopic
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goes from structure on one side to the same structure on the other side
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heterotopic
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goes from one structure in one hemisphere to a different structure in the other hemisphere
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ipsilateral
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goes from one structure to a different structure in the same hemisphere
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other modes of communication
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anterior commissure
hippocampal commissure |
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why are some functions localized to one hemisphere?
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these functions are generally non-spatial and so do not need to be represented in both hemispheres
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two primary investigation techniques
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WADA test
fMRI surgery and lesions split brain |
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WADA
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Inject sodium amytal into a brain area, which effectively puts it to sleep
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language lateralization
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non-spatial
left hemisphere dominance for speech comprehension and production for most people right hemisphere can recognize up to simple sentences |
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lateralization and emotions
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emotions can sometimes leak across hemispheres through subcortical structures, but this leads to guessing, not deliberate information about what the answer is
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touch and lateralization
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simple tasks can be completed by the subcortical structures, but more difficult tasks cant be completed
cannot compare across hands |
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vision
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left hemisphere better for local details
right hemisphere better for global detailsand face processing |
