lecture_17_july5 - Representation of map vs space Bisiach...

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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
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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
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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
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Synaesthesia How imagery interacts with memory
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Perceived stimulus Associated Experience   (inducer) (concurrent) Synaesthesia Synaesthetic experiences are both consistent and automatic
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1 2 3 4 5 6 7 8 9 grey white red purple blue green pink yellow black orange 0
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1 2 3 4 5 6 7 8 9 black light yellow blue dark yellow green pink purple light purple dark purple red 0
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* 2 7 congruent baseline incongruent Automaticity
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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%)
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