A Model for Integrating Elementary Neural Functions into Delayed-Response Behavior
Figure 13
Comparison of the Activity of Simulated Units of Layers WM and P with that of Cortical Neurons
Comparison between simulated (A) and experimental (B) units is restricted to the cue and delay periods (left of the dashed line on theoretical data), although the model makes predictions for the choice and response epochs as well. Notation: x → y + z = trial with sample x, target y, and distractor z. Other notations are as in Figures 1 and 2.
(A) Average firing patterns of cells of layer WM (neurons α and β) and layer P (neuron γ). For clarity, each graph represents the response of cells for only two trials (their firing for the other two trials being at background level). Task parameters and notations are as in Figures 1 and 2. Task parameters: cue, 0.5 s; d1, 0.3 s; d2, 0.4 s; d3, 1 s; choice, 0.5 s; response, 0.5 s.
(B) Recordings performed in monkey dorsolateral PF cortex (modified from Figure 5 of [12]). Activity was recorded in animals trained with six stimuli (Si and Ci [i = 1, 2, 3]) to perform a task of randomly mixed DMS and DPA trials. Images Si are only used as samples for DPA (and associated with images Ci), while stimuli Ci serve as targets in DPA trials and samples/targets in DMS trials. Here, for clarity, we reproduce only the response of each cell for two different trials (The response of cells for the other trials presented in Figure 5 of [12] is much smaller and mainly confined to the cue period). Task parameters: cue, 0.5 s; delay, 1 s.