Identify the brain pathways involved
in color perception and also in motion perception.
Brain pathways involved in motion
pathways:
- visual motion perception is
associated with both the parietal pathway as well as the temporal
visual pathway.
- there is an extension of the
magnocellular as well as parvocellular subdivision which is present
in the retinotropic cortex would be representing the parvo
pathway.
- this helps in direction of
attention present in the objects in the visual environment where
the motion sensitive areas are the dorsal magnocellular areas.
- also, there occurs involvement of
the ventral pathway which would be located in the intersection in
the lateral temporal cortex and the dorsal ventral streams will
also be involved in motion perception.
pathways in color perception:
- it begins from the primary visual
cortex, and would be processed through the ventral visual
pathway.
- there would be comparison of the
signals that come from the different photoreceptos.
- the cone receptors would be
sensiitive to the middle, short and long wavelengths and these
would be compared in the retinal circuit.
- there will be a relay in the
lateral geniculate nucleus
- colour processing will take place
in the cerebral cortex where there would be lineat summation of
cone signals.
- there will also be involvement of
the inferior temporal cortex that would result in colour
discrimination and is the final stage of the pathway.