In the LGN, does each layer receive input from a single eye?

In the LGN, does each layer receive input from a single eye?

• A. Each layer receives input from one eye
• B. The magnocellular layers receive input from the left eye only
• C. The parvocellular layers receive input from the right eye only
• D. The retina sends to LGN in a binocular fashion across layers

Answer: (A)

In the LGN the inputs from the two eyes stay separate. Each layer is fed by only one eye, preserving eye-of-origin and a precise retinotopic map as information passes on to the visual cortex. The two main LGN pathways, magnocellular and parvocellular, both carry signals from a single eye within their respective layers. Binocular combination doesn’t happen in the LGN; it occurs later in the primary visual cortex, where neurons can integrate input from both eyes. So the best answer is that every layer receives input from a single eye.

In the LGN the inputs from the two eyes stay separate. Each layer is fed by only one eye, preserving eye-of-origin and a precise retinotopic map as information passes on to the visual cortex. The two main LGN pathways, magnocellular and parvocellular, both carry signals from a single eye within their respective layers. Binocular combination doesn’t happen in the LGN; it occurs later in the primary visual cortex, where neurons can integrate input from both eyes. So the best answer is that every layer receives input from a single eye.