Spatial Perception
Allocentric reference
(extrinsic vantage, independent of position) extrapersonal space that extends well beyond arms, cued responses - movement guided by external cue
Egocentric reference
(relative to viewer's vantage) intrapersonal space- the space your body takes up, within arms reach. Position responses- made relative to your body
Sensory/motor translation
acting relative to the spatial organization of the external world (small scale)- reaching for an object
Posterior parietal lobe (precuneus of SPL)
activation for egocentric, episodic memory, self-processing operations
Hippocampal activation
active during allocentric encoding of spatial information (different start points) - right hippo
agnosagnosia
denial of physical disability or illness in pararlysis
Spatial perception
determining where horizontal or vertical is in the real world, even when given distracting information
R Precuneus damage
egocentric memory impaired
Micro/macrosomatoagnosia
egocentric, believing that one part of the is bigger or smaller than normal, usually one part of body and short-lived
Disembedding
finding figures hidden within other pictures
Neural systems/Medial temporal lobe
for spatial memory and spatial mapping, flexible navigation from different starting points in the environment (hippocampus and parahippocampal cortex)
Hemi-neglect
ignore all information on one side
Spatial visualization
imagining how well pieces of an object go together
Fundus
in L IPS involved in target-directed movement
reduplicative paramnesia
incorrectly identify and reduplicate persons, places, objects, events (hippocampal related)
topographical agnosia
loss of ability to identify landmarks with orientating value
topographical amnesia
loss of ability to navigate in environments that were familiar
autotopagnosia
loss of spatial knowledge of one's body, can't point to parts of body but can name them
Constructional abilities
manipulating objects so they have a particular spatial relationship
Egocentric syndromes
micro/macrosomatoagnosia, right/left confusion, finger agnosia, associated with dyscalculia and dysgraphia in gerstmann's syndrome, autotopagnosia, angnosagnosia
Areas activated by sensory feedback
middle temporal cortex (MT), dorsal steream, IPS intra-pareital sulcus, visual control of reaching
Spatial navigation
moving about the environment (large scale)- traveling to a more distant location
Important sensory motor areas
occipital, parietal, frontal cortex, cerebellum, basal ganglia, thalamus
Balint's syndrome
optic ataxia (can't reach out and touch an object in space), sticky fixation, simultagnosia
Neural systems/Parietal cortex
part of dorsal stream and activated during many spatial tasks
Spatial location and location memory
perceiving and remembering locations of objects
Motion perception
perceiving the change in an objects location over time
Egocentric spatial navigation areas
precuneus areas of parietal cortex
Spatial orientation
recognizing objects in different orientations or directions
Allocentric sydromes
reduplicative paramnesia, topographical amnesia, topographical agnosia
Spatial ability
requires understanding of an object's spatial location, geometry, and function
Most spatial pathology is in which hemispehere?
right
Parietal-frontal cortical systems
spatially directed movement, reaching and grasping objects in space. Input from hearing, touch, vision
Allocentric areas
sup and inf parietal lobules, LOC, hippocampus and for hand movements - intraparietal sulcus, dorsal premotor cotex
Parts responsible for allocentric
superior and inferior parietal lobules, ventrollateral occipito-temporal cortex, bilateral hippocampus
