Fig. 7: Representation of multiple images in a population.
a Schematic of the analysis. Responsive neurons (open and closed circles) were plotted for each image. Closed circles: responsive cells plotted for the first time for image N. Open circles: responsive cells that had already been plotted for image 1 – (N − 1). N, image number. b Raster plots of responsive cells for each image in the representative plane shown in a (n = 655/726 responsive cells). The image #s are sorted by the reconstruction performance (right panel). For each line, cells that did not respond to the previously plotted images are added to the right side. As the image # increases, the number of newly added cells decreases, and the cell # quickly reaches a plateau, indicating that many images are represented by a combination of cells that responded to other images. c, d The number of responsive cells (black line) and of newly added responsive cells (red line) are plotted against the image # for the case shown in b, c and averaged across planes d. The number of newly added cells quickly decreases as the image # increases. Three lines in each color indicate the mean and the mean ± S.E.M. e Schematic of the analysis. The feature set of each natural image was linearly regressed by the weights of the reconstruction model (the cell-selection model) from all the responsive cells in each plane. The weights of the reconstruction model were obtained based on a training dataset, and the target image was selected from a test dataset. The fitting error (%) was computed for each image. If the features encoded in all responsive cells were sufficient to represent natural images, the weights of the responsive cells should work as basis functions to represent the visual features of the natural images. f Distributions of the errors for all images in the example plane (shown in other figures). g The median error (%) across planes. Each dot indicates the median of each plane. d, g N = 24 planes. The stimulus image in e is adapted from the database in ref. 57 with permission. Source data are provided as a Source Data file.
