Which of the following statements about retinal signals from the right visual field is CORRECT?

Question

BlackTom AI · Accepted Answer

To analyze these statements, recall the organization of the visual pathway: each eye receives information from both visual fields, but signals representing the right visual field project to the left hemisphere, and signals representing the left visual field project to the right hemisphere. At the level of the thalamus, the retina signals from the contralateral visual field are routed to the opposite (contralateral) LGN, and then preserved to the corresponding primary visual cortex (V1) in the same hemisphere.

Option a) 'They go to the left LGN and then the left primary visual cortex.' This aligns with the standard anatomy: the right visual field is processed by the left hemisphere, first reaching the left LGN and then the left V1. This statement is correct.

Option b) 'They go to the right LGN and then the right primary visual cortex.' This would imply processing occurs in the right hemisphere for the right visual field, which contradicts the contralateral organization of the visual pathways. It is incorrect because the right visual field is not processed by the right LGN or right V1.

Option c) 'They go to the left LGN and then the right primary visual cortex.' While the left LGN is involved, the signal does not cross to the right V1 after LGN in this context; the left LGN projects to the left V1. This statement is incorrect due to incorrect cortical destination.

Option d) 'They go to the right LGN and then the left primary visual cortex.' This mixes contralateral routing in a way that does not match the actual pathway: right LGN processes left visual field, not right, and it would project to the right V1, not the left. This is incorrect because both the LGN and V1 stay in the same hemisphere as the initial contralateral input.

In summary, option a correctly captures the contralateral routing: right visual field → left LGN → left V1; all other options propose incorrect hemispheric assignments at either the LGN or V1 level.

Which of the following statements about retinal signals from the right visual field is CORRECT?Single choice

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