cogs107cs8

cogs107cs8 - I spatial cognition a concerned with...

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I. spatial cognition a. concerned with acquisition, organization, utilization and revision of knowledge about spatial environments. b. Anatomy: i. Parietal lobe: 1. The end of the dorsal stream (the “where” stream) a. Spatial representation, visuomotor integration, hemisphere differences, attention 2. Damage results in: a. neglect, simultagnosia (balint's syndrome) b. optic ataxia: can’t use visuospatial info to guide arm movts c. apraxia: inability to initiate voluntary movements d. akinetopsia: inability to perceive motion ii. Leading hypothesis: parietal cortex neurons construct space by combining multi-sensory modalities with motor signals c. VIP: perioral space i. visual and tactile responses ii. fire in response to vector and where vector ends (eg "duck" if a ball is coming toward your face) iii. tactile RFs are centered around the mouth iv. V+T units have similar movement direction tuning v. Visual responses can be eye or head centered vi. Some visual responses are tuned to movement of an object toward a particular portion of the face, independent of gaze d. AIP: object shape i. visual, motor and visuo-motor responses ii. object shape and orientation sensitive iii. motor responses are hand-movt sensitive (reaching in correct trajectory) iv. deactivation causes grasping deficits v. connected to area f5, which is involved in grasping e. MIP: immediate extrapersonal space (not officially localized in human) i. visual, somato, and bimodal units ii. pure somato units have RFs on hand iii. bimodal units activate strongly during reaching iv. some pure visual units show stronger responses when a target is within reaching distance v. bimodal RFs are located near each other (tactile RF on the hand = visual RF near hand) vi. visual RF moves w hand vii. visual RF expands when monkey uses a tool for reaching (d-cog)
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f. LIP lateral intraparietal: Spatial Awareness - posterior parietal cortex i. Retonotopic ii. neurons respond to the onset of visual stimuli iii. visual responses are enhanced by requiring that the monkey attends to the stimulus iv. prolonged responses occur when the monkey must remember the location of the space g. parietal cortex neurons in rodents:
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cogs107cs8 - I spatial cognition a concerned with...

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