Higher Visual Processing Flashcards
From where are the visual information streams segregated?
From retina to visual cortex
Is information from each eye mixed in the thalamus?
No
What type of information do M ganglion cells carry?
Motion
What type of information do P ganglion cells carry?
Colour
What is the input layer from the thalamus into sensory cortices?
Layer IV
In which layer of V1 do M cells terminate?
Layer IVC alpha (superior)
In which layer of V1 do P cells terminate?
Layer IVC beta (inferior)
Which layer of V1 is important for motion detection?
Layer IVB
From layer IVC, where does information go?
Other layers of V1
To what area do layers II, III, and IVB send their information?
Other cortical areas like
- V2, 3, 4, 5
- MT
To what area does layer V send its information?
Superior colliculus
Pons
To what area does layer VI send its information?
Lateral geniculate nucleus
What is the diameter of M ganglion cells?
Large
Are M ganglion cells wavelength sensitive?
No
To what part of the brain do M ganglion cells project?
Magnocellular layer of LGN
Where do M cells from the thalamus project to?
Layer IVC alpha of V1
Where do cells from layer IVC alpha project to?
Layer IVB of V1
Where does mixing of information from the two eyes occur?
In layer IVB of V1
What kind of selectivity do some cells have in layer IVB?
Orientation selectivity
Directional selectivity
How much of the cortex is involved in vision?
40%
What is the Brodmann’s area of the secondary visual cortex (V2)?
Area 18
What are the two streams of visual processing?
Dorsal
Ventral
What does the dorsal pathway process?
Where; eg: movement
What does the ventral pathway process?
What; eg: object recognition
