W21-L11: Higher Visual Processing Flashcards
Where do M cells terminate in the visual cortex?
Layer 4 C a
Where do P cells terminate in the visual cortex?
Layer 4 C b
What are the characteristics of M Cells?
- Large diameter ganglion cells
- wavelength insensitive
Where do M cells in layer 4 C a of the visual cortex project to next?
Layer 4 C B
Where is mixing of P and M cell visual information?
After you enter the primary visual cortex
What is directional sensitivity and where do cells show it?
cells that respond to a moving stimulus, but only in a single direction, some cells in layer 4 b
What percentage of the cortex is involved in vision?
40%
What are the two parallel visual streams and what do they contain?
Dorsal: where is the visual field is an object
Ventral: what is identifying the object in the visual field and colour
What is area MT?
middle temporal lobe is an area specialized for processing object motion
What are characteristics of neurones in area MT?
- large receptive fields.
- Respond to stimulus movement.
- Almost all the cells in area MT are directional selective.
How is colour perceived?
determined by the activity of ganglion cells, P ganglion cells exhibit a colour opponent centre- surround
What is Area V4?
Part of the ventral stream, Neurons in V4 have large receptive fields that are both orientation selective and colour selective, Important for perception of shape and colour.
What is area IT?
A major output of Area V4, Important for visual memory and perception and perception of faces.
What are two ways colour vision deficiencies occur by?
Acquired or inherited
T/F Few people are truly colour blind
True
