Chapter 10: Vision 2 & 3 Flashcards
What are 3 essential facts about later 4C?
- M and P pathways remain segregated
- cells are still center-surround, On and Off pathways remain segregated
- cells are monocular- receiving input from either one eye or the other
Where does each layer of the LGN receive inputs from?
From one eye or the other
Outside of layer 4C of the striate cortex, can cells be driven by both eyes?
Yes, cells outside of 4C are binocular
What do many binocular cells code for?
For retinal disparity- differences in images from the left and the right eye that the brain uses as a binocular cue to determine depth or distance of an object
What do you call the binocular cue of disparity tuning?
Stereopsis
What is an important receptive field property emerging in V1?
Orientation tuning
How does orientation tuning work?
Simple cell receptive field: inputs from rows of on and off center cells from 4C converge.
What is important for form perception?
Orientation tuning
What perception does orientation tuning enable?
Form perception
What is another type of selectivity emerging in V1?
Direction seleciticty
Explain what direction selectivity is
Cells respond to movement in one direction (preferred) but not the other
From V1, where does visual information proceed to
To a host of exastriate or association visual cortical areas
What are the two streams of processing?
Dorsal and ventral streams
Dorsal: Magno-Pathway —> “where” “action”
Ventral: parvo/konio-pathway —> “what” “who”
Where is motion represented?
In the middle temporal area MT
What would lésions of MT entail?
Abolish the ability to perceive structure from motion
