Fig. 9.

Neuronal activity in the superior colliculus (SC) fails to distinguish decision confidence. A and B: average spike density functions (SDFs) (σ = 10 ms) plotted over time for 224 single and multineurons while a monkey performed the Stimulus-Matched task in trials with opt-out (OO) unavailable (A) or waived (B). Solid lines show high-positive evidence (HPE) trials and dotted lines indicate low-positive evidence (LPE) trials. The activity in HPE and LP trials is not significantly different. C and D: normalized SDF (σ = 10 ms) of the same neurons shown in A and B. The activity was normalized to a 300-ms time window starting 300 ms after the random moving dots appeared. E: choice probability (CP) as a function of time sorted by each coherence in OO-waived trials. Solid lines indicate HPE trials, and dotted lines indicate LPE trials. Trial alignment is indicated by the vertical dashed lines and the upward arrowheads. F: same as in E for OO-unavailable trials. Gray rectangles indicate the epoch used for quantification; 200 ms timescale is for E and F (P > 0.05).