The lateral geniculate nucleus processes which sensory modality?

• A. Auditory
• B. Vision
• C. Somatosensory
• D. Olfactory

Answer: (B)

The lateral geniculate nucleus is the visual relay in the thalamus. It receives input from retinal ganglion cells and passes it on to the primary visual cortex, preserving a retinotopic map and supporting different visual pathways (such as motion versus detail/color) through its layered structure. Because of this role, it processes visual information rather than auditory, somatosensory, or olfactory signals. Auditory information goes through the medial geniculate nucleus, somatosensory through the ventral posterior nucleus, and olfactory processing involves primary olfactory cortex with only indirect thalamic involvement. So, the lateral geniculate nucleus processes vision.