Fig. 6: LIP neurons encoded both SW_in and SW_out.

a Population averaged kernels for \(S{W}_{{{{{{\rm{in}}}}}}}\)(blue) and \(S{W}_{{{{{{\rm{out}}}}}}}\) (orange) for monkey H (upper panel) and monkey M (lower panel). The curve width denotes S.E. across units. The grey vertical lines indicate the onset of the next stimulus. b The neurons’ selectivities for \(S{W}_{{{{{{\rm{in}}}}}}}\) and \(S{W}_{{{{{{\rm{out}}}}}}}\), quantified as the average kernel weights within the time window, indicated by the black lines on the x axis in (a). Each marker is a neuron, whose color indicates the significance of the neuron’s \(S{W}_{{{{{{\rm{in}}}}}}}\) and \(S{W}_{{{{{{\rm{out}}}}}}}\) selectivity, and the shapes indicate the monkeys (circles: monkey M, triangles: monkey H). Empty markers (monkey M: 9, monkey H:9) indicate the neurons without any significant selectivity. Filled black markers (monkey M: 41, monkey H:35) indicate the neurons that are selective to both, and the selectivities for \({S}{W}_{{{{{{\rm{in}}}}}}}\) and \(S{W}_{{{{{{\rm{out}}}}}}}\) are not significantly different other than the sign. Blue markers (monkey M: 42, monkey H: 19) indicate the neurons that are selective to both, but the selectivity is significantly different. Red markers (monkey M: 13, monkey H:18) indicate the neurons only selective to \(S{W}_{{{{{{\rm{in}}}}}}}\). Green markers (monkey M: 10, monkey H: 9) indicate the neurons only selective to \(S{W}_{{{{{{\rm{out}}}}}}}\). The dashed line is the anti-diagonal, and the histogram shows the distribution of the difference between the neurons’ selectivities for \(S{W}_{{{{{{\rm{in}}}}}}}\) and \(S{W}_{{{{{{\rm{out}}}}}}}\) in monkey M (blue) and H (yellow), whose means are not significantly different from 0 (monkey M: p = 0.65, monkey H: p = 0.83, two-tailed t test). The mean and the p value for the combined monkeys’ data are indicated in the histogram.