visual perception Flashcards
functionalism
goal of perception
pereption is used to boost survival - evolutionary
gestalt theory
context critical
objects arent sensations
vision is an active proess
structuralism
sum of parts and sensations
intensity, extent, duration
introspection
used for structuralism
issues due to stimulus error
empiricism
perception as a contructive process, top down
needs pre-existing knowledge
psychophysical isomorphism
perceptual organisation phenomena
brunswick probabilistic functionalism
objects create a cluster of cues
unreliable
inferrence required
form perception
info > retinas = ambigious
T illusion
vertical line perceived as 10% longer than horizontal
Hemholtz
visual world is not random
unconscious inferences used to interpret retinal images
gregory
bottom up
sensory inputs > nervous system > existing knowledge > hypothesis
neuro explanation for perception
info > eyes > visual cortex occupital lobe
ventral cortex
shape and colour
dorsal cortex
space and motion
optic array
direct perception
direct perception
simultaneous cues present
inferences are not needed - complex cues
marrs multilevel approach
perception is NOT direct
1- computational level
2- algorithm level
3- hardware implementation
issues of marrs multilevel approach
goal not always known
hard to seperate levels
computational level (marrs)
goal / strategy
algorithm level (marrs)
implementation of strategy to reach goal
hardware implementation (marrs)
physically recognised
