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NESC 3227 (19)
Kim Good (19)

March 7th, 2013.docx

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Dalhousie University
NESC 3227
Kim Good

March 7th, 2013 March-07-13 1:01 PM Path integration (dead reckoning)  How you determine where your current position is relative to your next position  How you get that information comes from self-generated cues Vestibular system and hippocampus  The semicircular canals within the ear o Can give velocity and acceleration information  Vestibular loss is often associated with hippocampal atrophy Path integration and temporal lobectomy in humans  Blindfolded patients in darkened room o To eliminate landmarks  The task was that participants led along two sides of a triangle and had to return to their place of origin Control (non-navigation) spatial tasks  Had to draw the angle of the turn on the route, and the distance of their route  Controls made it back to point of origin fairly accurately Results: no impairment on paper and pencil spatial tests  No difference between left and right temporal lobectomy  The conclusion is that anterior temporal lobe structures are not involved in labeling body orientation, mental rotation, or labeling turns  In homing vector and route reproduction tasks the right temporal lobectomy group did more poorly in Conclusions  Right medial temporal lobe is not involved in angle or distance estimation  Right medial temporal lobe is involved in path integration and route reproduction ***Start Chapter 22*** What is attention  Selectively concentrating or focusing in on one aspect of the environment, and ignoring everything else  Selective awareness of stimuli  Selective awareness of responses  There are many theories of attention, no one theory has been accepted as being the correct one, but posner's schema is popular and well researched Continuous performance test  Neuropsychological test that measures a person's sustained and selective attention and impulsivity  Many different versions The attention network test - visual  Computerized presentation, fMRI in healthy persons  Measure reaction time and brain activity under 3 conditions o Alerting  A cue or no cue o Orientating  A spatial cue (above or below) o Executive  Congruent versus incongruent cue  Stimuli are presented over a very very brief amount of time Networks of attention in
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