Stimulus trial-averages of RNN hidden layer activity projected into UMI and PMI subspaces over the course of a trial (stimulus <i>n</i> to <i>delay 2</i>:<i>2</i>).

Abstract

(A) Results from an example 7-hidden-unit network. Dot color indicates stimulus n’s identity. (B) Time course of scalar transform over the course of a trial, averaged across 10 networks. Blue vertical line indicates the timestep when stimulus n + 1 is presented. Light blue shading shows the timesteps that were used to identify the dPCs. The gray shading around the curve indicates standard error of the mean. The gray dashed lines indicate a scalar transform of 0; the stimulus representational format is reversed after crossing this line. (C, D) Same as (A, B) but for the 60-hidden-unit RNNs. In C, data points of adjacent stimulus orientation angles are connected by a gray line.</p