Fig. 3: LIP neurons encoded shape weights.
From: Evidence accumulation occurs locally in the parietal cortex
a The PSTH (left: monkey M, right: monkey H) aligned to the onset of the shapes, averaged across the epochs and the trials. The traces are sorted by shape weight. b Response kernels for shape weight based on the Poisson GLM. Each row is a neuron, and the colors denote the gain. Red and blue indicate positive and negative kernel weights, respectively. Most neurons show negative kernel weights (blue, monkey M: 76 out of 115, monkey H: 53 out of 92), indicating that the shapes with a positive weight suppress LIP responses. Neurons are sorted by average kernel weights across time, separately for each monkey. The black bar on the time axis indicates the period when the stimulus is on the screen. c Population kernels for shape weight. The bars along the abscissa indicate the periods when the kernel weights are significantly different from 0 (two-tailed t tests, p < 0.01). The curve width in a and c denotes S.E. across units. Shaded areas indicate the period when the stimulus is on the screen. The grey vertical lines indicate the onset of the next stimulus.
