Robust and brain-like working memory through short-term synaptic plasticity
Fig 6
Dimensionality reduced space plots for the most brain-like models.
Time-averaged RNN activity during the sample-period as well as 500ms before the end of the delay period. Linear Discriminant Analysis (LDA) was used to project the data into three-dimensions. To account for differences in training/test splits, an Orthogonal Procrustes operation was used to rotationally align the sample and delay period activity. Colors denote sample IDs. Fixed synapse models have activity organized around simple attractors in state space. There is one attractor for each sample ID. Plastic synapse models exhibit high sample-separability in synaptic state space, and limited separability in the neural state space during the delay period. Similarly, PFC exhibited higher neural discriminability during the sample than during the delay period.