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23 Cards in this Set
- Front
- Back
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What is attention? |
Withdrawl from some things in order yo deal effectively with others -alertness and arousal -vigilance -selective attention -orienting -effort and resource capacity -mental workload and task difficulty -sensory specific? |
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What happens in Poserner's attention switching paradigm? (component processing by discrete brain areas) |
-covert attention -when an asterix matches the side, the reaction time is much faster -if you cant disengage you will not be able to switch -disengaging, moving and re-engaging takes time! -Parietal, superior colliculus, thalamus |
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Divided attention in the DLPFC |
Bimodal: vision and audition -specific bimodal attention exists in the DLPFC |
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What are the symptoms of Posterior Parietal Lobe damage? |
Contralateral neglect: left side of space is neglectes, cross modally, not just vision/ -lesion usually in right inferior parietal lobe -right intraparietal sulcus and the right angulaar gyrus -sometimes after lesions to frontal lobe ad cingulate cortex -defective sensation or perception -defective attention or orientation |
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Hemineglect |
Generally seen with left parietal regions in right space -hemi-inattentions: ignores or cannot attend to one side of space -contralateral -body midline multisensory somatoparaphrenia: cannot recognize body parts
Right hemisphere can compensate for leftH damage double simultaneous stimulation technique -extinction
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Extinction |
Patients report left not right. -detect a single stim -either ipsi or contralesional -presenting may or may not reveal a deficit Failure to detect the contralesional stim when a concurrent stim is presented on the ipsilesional side -left finger presented on its own he gets it but if its both at the same time he will always choose right |
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Line bisection task |
Anything from the midline to the left is being ignored, quick way to see if they are ignoring the left side of space |
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Antiballistic |
They would report ballistic, when it comes to semantic search they can draw attention to the word |
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Plaza and hemi-neglect |
how they position themselves indicates how they will report it, not just eternally driven -recall shows hemi neglect simply using memory -NOT only external stimuli |
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memory is intact left side neglect not externally driven
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attention may be required to recall things -attention and memory are intimately linked |
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Extinction within peripersonal space (intimacy, threat, ownership) |
Neuropsych studies: brain areas specilized for coding of visual space surrounding the body Cells in parietal , frontal cortices anfd putamen -respond to visual stimuli in spacial proximity to a part. body part -bimodal -receptive fields for visual stim match those for tactile on body surface -SSUGGECTS THAT THESE BRAIN AREAS ARE PART OF AN INTERCONNECTED SYSTEM FOR INTEGRATED CODING OF PERIPERSONAL SPACE CENTERED ON BODY PARTS -not only stimuli on body part bt close to |
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Right parietal patients with left tactile extinction -also occurs with an ipsilesional visual stim near the hand -same degree as tactile -also works for crossed hands |
-far less extinction observed when visual stim was presented away from space around the hand |
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Results: |
If you tough both at the same time they will not report the left Polymodal more than tactile, even if its only visual on the right they still choose right, not leftt -if you touch left and wiggle over absent right, it does not end in full extinction |
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Same exp. but with eyes |
Same results, crossmodal system exists for hands AND face. -funcitonally distinct from the system controlling visual info from extrapersonal space -you lose a good proportion of the left recognition if the right can see |
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Does vision of the hand mediate the integrated visual tactile input in peripersonal space |
extinction occured onlt when the rubber hand was in compatible orientation to the reak hand -can be decieved by a plausible fake |
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Can peripheral space be modified? |
Extinction was greater after the tool was used. -immediate pointing did NOT lead to extinction after a 5 min delay return to baseline
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Prism effect |
therapeuti invention to shift the vuisual field left |
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Ballint's syndrome |
Simultaneous agnosia(visual perception) -cant recognize more than one object at a time Optic ataxia: difficulty directing eyes -deficit in visually guided reaching Psychic paralysis -oculomotor apraxia -difficulty directing saccades to object on=f interest -difficulty breaking fixation from that object Damage to posterior parietal cortex: -bilaterally -region has been described as vision for action region
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Ballints cont. |
Simultaneous agnosia: Report the object closest to them Attentional problem not visual -cant reach out and grab |
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Case if JG |
3 year old male -fever and rash meningitis intracerebral hemorrhagng in right and left parietal lobes - trouble reading long words -following sequences -writing words in correct order -in a line etc |
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JG cont |
Had Ballint's could name shapes but had trouble drawing them. moving escalators, walked into people, couldnt move towards sounds
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Adaptive approach for JG |
carefully scan the ground keep env. uncluttered phonetic spelling -spaced text learned better by listening -use hearing and touch not just vision -look at env. in blocks
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Vision for action is a dorsal stream process |
ataxia has sensory specific component optic ataxia: inaccuracy of visually guided arm movements |
