psych of perception chapter 4 Flashcards
LGN
lateral geniculate nucleus
relays visual information from the retina to the primary visual cortex (V1) and also receives feedback from V1
superior colliculus
eye movement controlling
specialized for detecting, localizing, and orienting toward environmental events and has a critical role in orienting motor responses, visuospatial attention, and perceptual decision-making.
optic chiasm
part of the brain where the optic nerves cross
cells that are feature detectors
simple cortical cell
complex cortical cell
end-stopped cell
LGN function
regulate neural information from the retina to the visual cortex (realying station)
siganals are organized by eye, receptor type, environmental information
projections from retina to cortex
nasal inputs - contralateral projection
temporal inputs - ispilateral projection
who will process right visual field?
left hemisphere
who will process left visual field?
right hemisphere
selective adapation
neurons tuned to specific stimuli fatigue when exposure is long
selective rearing
neurons that respond to these stimuli will become more predominate due to neural plasticity
(early visual experiences are important for forming normal vision)
cortical magnification
a small area of fovea is represented by a large are on the visual cortex
0.01% is present 8-10%
retinotopic map
dimensional projection from the retina to the cortex
the cortex is oranized in columns
location column (same location on the retina)
orientation columns
ocular dominance column (preference for inputs from L or R eye)
lesioning or ablation experiments
animal is trained to indicate perceptual capacities, then specific part of the brain is lesioned, animal is re-trained to determine which perceptual abilities remain
results reveal which portions of the brain are responsible for specific behaviors
object discrimination problem
‘what’ pathway - ventral
find the correct object
removal of temporal lobe tissue resulted in problems with object task
