Neuroscience Match the visual deficits from the bank on the right (if any) that
ID: 91662 • Letter: N
Question
Neuroscience
Match the visual deficits from the bank on the right (if any) that would result from the scenarios listed below. List one letter per scenario. Letters can be used more than once, but not all letters will be used. Loss of left primary visual cortex (V1) No cone photoreceptors No rod photoreceptors Loss of region MT in both hemispheres No retinal ganglion cells Loss of region V4 in both hemispheres A. Cannot recognize objects B. Complete blindness C. Loss of night vision D. Loss of right side of visual field E. Loss of left side of visual field F. Red/Green colorblindness G. Cannot see color H. Loss of upper half of visual field I. Loss of lower half of visual field J. Cannot see continuous motion K. No perceivable defectExplanation / Answer
1.D. Both hemispheres of the brain contain a visual cortex; the visual cortex in the left hemisphere receives signals from the right visual field, and the visual cortex in the right hemisphere receives signals from the left visual field.Loss of left visual cortex wiil result in the loss of right side of visual field.
2.G.Loss of cone photoreceptors causes loss of colored visison.
3.C. Loss of rods will cause night blindness.
4.J. The middle temporal visual area (MT or V5) is a region of extrastriate visual cortex.The MT in primates is thought to play a major role in the perception of motion, the integration of local motion signals into global percepts, and the guidance of some eye movements.thus its loss causes lack of continuous motion to be seen.
5. A.retinal ganglion cell (RGC) is a type of neuron located near the inner surface of the retina of the eye. It receives visual information from photoreceptors via two intermediate neuron types: bipolar cells and retina amacrine cells..Its loss will cause no recognition of objects as image will not be formed properly.
6.Visual area V4 is one of the visual areas in the extrastriate visual cortex.