Conflict Resolution as Near-Threshold Decision-Making: A Spiking Neural Circuit Model with Two-Stage Competition for Antisaccadic Task
Fig 6
The model reproduces the observed diversity in the neuronal responses between prosaccade and antisaccade across brain regions.
In all panels the target stimulus was presented on the left. Each panel displays spike rasters (top) and trial-averaged firing rates (bottom) from sample neurons. In the visual layer of the remapping module, depending on the type of recorded visual neurons we observe A, stronger prosaccade than antisaccade responses (Dir neurons) or B, stronger antisaccade than prosaccade responses (Inv neurons). C & D. Most movement neurons in the remapping module exhibit stronger antisaccade responses than prosaccade responses (C, align to the stimulus onset. D, align to the saccade onset). E, In the action-selection module, saccade neurons exhibit two waves of activity during antisaccade. Neurons receiving the direct visual stimulus develop a fast but weak response which is followed by a strong movement response on the correct side (right). F, if we compare the same neurons (SacR and SacL) between prosaccade and antisaccade, the neuronal responses in the prosaccade trials are stronger than those of the antisaccade trials prior to the saccade onset. All activity shown here were recorded from the simulated Gap task. Activity exhibited in the NoGap or Overlap tasks is qualitatively similar.