Which of the following is an explanation for the higher acuity of the visual system at the fovea, relative to the periphery of the retina?
A) A foveal ganglion cell may receive information from a single photoreceptor, whereas a peripheral ganglion cell may receive information from multiple photoreceptors.
B) The fovea contains only rods which are directly connected to the ganglion cells.
C) The foveal photoreceptor cells contain more photopigment per cell.
D) Peripheral photoreceptors are more likely to be damaged by prolonged light exposure.
E) Peripheral photoreceptors require greater activation in order to provoke a visual response.
Answer: A
Rationale: An explanation for the higher acuity of the visual system at the fovea, relative to the periphery of the retina is that a foveal ganglion cell may receive information from a single photoreceptor, whereas a peripheral ganglion cell may receive information from multiple photoreceptors.
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