Perception Flashcards
brightness and luminance
brightness: the perception of how bright something is
luminance: a physical measure of light intensity
we’ve found that although these two concepts would seem to be consistent, they oftentimes are not -> optical illusions
our perception and surrounding schemas about objects create a discrepancy
factors that can influence brightness and luminance
context
- brightness is dependent on surrounding context
- source of luminance not specified in visual signal
- experience of objects in real world
color contrast
the same color can look different in diff contexts
color constancy
different colors can look the same depending on context
color sensitive areas
v4/v8 appear to be specialized for the perception of color
- recordings in monkey
- lesion studies in humans (Monet vs Picasso)
- fMRI studies of color perception
akinetopsia
failure to perceive motion
patient LM suffered from this -> suggests there are motion sensitive areas in the brain
location of perception
study on altering speeds of different colored stimuli suggest perception is related to processing in secondary visual regions(v4, v8, MT)
more on V1 and optical illusions
size of activation in V1 related to perceived size of images and that projection onto retina-> bigger images, more activation
ebbinghaus illusion:
people who see less of an illusion have larger visual cortexes (dots further apart), & vice versa w smaller visual cortexes
view dependent approach to object recognition
information used in recognizing an object is derived from a specific viewpoint/orientation of that object
this would require an endless number of cortical representations of an object
view invariant approach to object recognition
basic stimulus properties are derived from sensory input regardless of the viewpoint/orientation
neural representation same
