lecture_17_july5

lecture_17_july5 - Representation of map vs space •...

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Unformatted text preview: Representation of map vs. space • Bisiach et al., 1979 – Verbal description of cathedral square in Milan – Patients imaging themselves standing in front of cathedral and describe scene – Next imagine they had turned around, and were on the steps of cathedral looking out onto square • Patients FAIL to describe details of left side, regardless of where they are standing • Whole scene stored in memory but only half of it is accessible! • Not a memory deficit but a spatial representation deficit Frame of reference- somatosensory system • What is neglected? – Contralateral side of space? – Or contralateral side of body? • Moscovitch & Behrmann, 1994 • Tested 11 patients with unilateral neglect – Right hemisphere lesion • Patients was given a light touch simultaneously to the R and L wrist of 1 hand • Tested hand in palm-up vs. palm-down position Frame of reference- somatosensory system • Patients neglected stimulation on the side of space contralateral to damaged brain area • REGARDLESS OF HAND POSITION – So contralateral SPACE is neglected independent of hand position • Localization of stimulation in somatosensory system occurs within a spatially defined frame of reference – Not with respect to a somatotopic map Synaesthesia How imagery interacts with memory Perceived stimulus Associated Experience (inducer) (concurrent) Synaesthesia Synaesthetic experiences are both consistent and automatic 1 2 3 4 5 6 7 8 9 grey white red purple blue green pink yellow black orange 1 2 3 4 5 6 7 8 9 black light yellow blue dark yellow green pink purple light purple dark purple red * 2 7 congruent baseline incongruent Automaticity 400 450 500 550 600 650 700 750 800 C Non-synaesthete Participants Reaction Time (ms) Congruent Incongruent (1.4%) (2.8%) ( 1.0%) (2.8%) 5 4 6 2 3 7 3 4 6 1 3 9 1 2 3 3 4 1 1 4 1 5 4 7 6 6 6 7 9 5 8 3 6 3 2 9 1 1 3 8 1 4 9 Synaesthesia and Memory 10 20 30 40 50 60 70 Black Incongruent Congruent Type of Matrix Percent Correct C 1 2 3 4 5 6 7 1...
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This note was uploaded on 03/19/2010 for the course PSYCH 207 taught by Professor Lodson during the Spring '05 term at Waterloo.

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lecture_17_july5 - Representation of map vs space •...

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