22-Motor3 Flashcards
Parietal cortex links ___ cortex to ___ cortical areas
visual, motor
Area 5 of parietal lobe is involved in ___
proprioception, somatosensory, reach
Area 7a of parietal lobe is involved in ___
visual oculomotor
Area 7b of parietal lobe is involved in ___
somatosensory
Parietal neurons encode [spatial/temporal] features of visual stimuli
spatial
Parietal lesions produce (x3)
- reaching deficits
- saccade deficits
- attention deficits
LIP
lateral interparietal, part of saccade network
Saccade network: parietal areas (x1)
LIP
Saccade network: outputs (x2)
- superior colliculus
- frontal eye fields (FEF)
Reach network: parietal areas (x3)
- MIP (parietal reach region)
- V6A
- Pec
Reach network: outputs (x1)
(dorsal) premotor cortex
Grasp network: parietal areas (x2)
- AIP
- PF (7b)
Grasp network: outputs (x1)
(ventral) premotor cortex
Oculomotor apraxia
visually guided saccade deficits (fewer, slower saccades)
Simultanagnosia
inability to percieve more than one object at a time
Optic ataxia
visually guided reach deficits (i.e. misreaching)
In optic ataxia, errors are worse if (x2)
- targets are in contralesional visual space
- contralesional hand is used
Properties of visual parietal neurons (x3)
- retinocentric receptive fields
- receptive fields are large and peripheral
- driven by simple stimuli
true
true
false (true for MST, not VIP)
false (true for VIP, not MST)
debated
LIP involved in [reach/saccade] control
saccade
PRR involved in [reach/saccade] control
reach
true
