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A probabilistic, distributed, recursive mechanism for decision-making in the brain

Fig 1

Random dot motion task and statistics of neural responses in sensory cortex (MT).

(a) Fixed duration task for MT recordings [24]. (b, c) Reaction time task for sensorimotor cortex and striatum recordings, N = 2, 4 alternatives [3, 6]. (d, e) Smoothed population moving mean and variance of the firing rate of MT during the fixed duration dot motion task (189–213 neurons), aligned at onset of the dot stimulus (Stim), for a variety of coherence percentages (colour-coded as in the legend in panel f). Solid lines are statistics when dots were moving in the preferred direction of the MT neuron. Dashed lines are statistics when dots were moving in the opposite, null direction. Data from [24], re-analysed. (f) Lognormal density functions for the inter-spike intervals (ISI) specified by the statistics over the approximately stationary segment of (d, e) before smoothing (parameter set Ω in Table 1). Preferred and null motion directions by line type as in (d, e).

Fig 1