Perception Flashcards
Is sensation conscious?
No
Perception is conscious
Nociception is sensation, pain in perception
What is the McGurck effect?
What we see overrides what we hear
Hear Va when someone says Ba but we see Va
What are factors determining awareness?
Receptor Functional receptor Receptor mechanisms Selective attention Emotions and experiences Drugs
How is the primary visual cortex organized?
Grid patterns called hyper columns
-cells that respond colors are found within the grid formed by the ocular dominance and orientation columns
Within the visual cortex, what is overepresented relative to the periphery?
The fovea
What is depth perception dependent on?
Binocular vision
Maintenance of occular dominance
When are orientation columns established?
First 6 months - 6 years of postnatal life, allowing the integration of visual field information
Called the critical period
What is the critical period?
Time when orientation columns are developing
If disturbed a correction cannot be made
What does removing one eye do?
Causes the other eye to take over space in the visual cortex
What is strabismus?
A muscle imbalance resulting in the misalignment of the visual axes of the two eyes
At first there is Diplopia, then the image of the weaker eye is suppressed, relieving the Diplopia.
However, with time the suppression becomes permanent causing amblyopia (lower visual acuity in the weaker eye)
What are the three channels of color information?
Luminescence (L+M): red+green= detects black/white contrast
L/M: red/green detects red/green differences
S-(L+M): blue/yellow difference
What is luminescence detected by?
M ganglion cells which have relatively large receptive fields (rods also through M ganglions)
What are L/M channels detected by?
P ganglion cells (smallest receptive field)
What is S-(L+M) channel info detected by?
k ganglion cells
Where does information relating to form and color go?
(From P ganglion cells primarily)
Travel centrally toward the temporal cortex= ventral stream = What pathway
