Laminar differences in the representation of visual images within the cortical area TE

Tamura, H., Murayama, Y., Miyata, K., Fujita, I.

Responses to a set of visual stimuli were compared among neurons in layers 2/3, 4, 5/6 of area TE, and in all layers of area TEO of Japanese monkeys. For each layer structure we plotted the visual stimuli in a multidimensional neuron-space according to the visually-evoked activity patterns across neurons. The Euclidean distances between the stimuli in the space were tabulated as a distance matrix. If two populations of neurons represent visual stimuli in a similar way, their distance matrices will be similar. We used cluster analysis to evaluate the similarity among matrices and found that the matrix derived from neurons in layer 4 of the TE was similar to that from area TEO and differed from layers 2/3 and 5/6 of the TE, while the matrix derived from layers 2/3 was similar to that of layer 5/6. The results suggest that representation of visual stimuli was transformed across layers within area TE. Supported by MEXT and CREST.