Coupled Drift-Di↵usion Model and Collective Decision-Making

Figure 83: (a) The network of [263] contains three populations of excitatory cells; each selective population responds preferentially to one stimulus, the third is nonselective to both stimuli. A fourth population of interneurons provides overall inhibition. Excitatory (NMDAand AMPA-mediated) and inhibitory (GABAA-mediated) synapses are denoted by filled and open ovals respectively. All cells receive noisy AMPA-mediated background excitation; each cell connects to every other and selective populations have relatively stronger local recurrent excitation. (b) Stimuli excite both selective populations, but inhibition typically suppresses one population, producing winner-take-all dynamics. A decision is made when the first population crosses a fixed decision threshold. Figure adapted from [60].