Fig. 2

Example cells with a preference for the non-animal (a–d) and the animal (e–h) categories. (a) Raster plot of the cellular response. First 1500 trails correspond to animal objects, the last 1500 trials correspond to non-animal. In the experiment, the trials were randomized, here they are sorted for presentation purposes. (b) Firing rate in response to the objects from two categories: average firing rate from the appearance of the stimuli until 100 milliseconds after its removal, in bins of 25 milliseconds, and firing rate for the whole period (inset). c Average firing rate of a neuron in response to each of the 100 stimulus images, sorted in descending order by firing rate. The x-axis (‘image rank’) represents the position of each image after sorting. The images are the six stimuli with the highest and the lowest response rate. (d) Firing rate in response to three schematic features with five levels each: shape compactness, shape eccentricity and texture standard deviation, and average image energy. The firing rate is higher for the more circular objects with smooth contours. (e–h) Response of the example cell with a preference for the animal category, elliptical objects, and objects with jagged contour.