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Significance Previously, the neuronal correlates of perceptual confidence have been identified in neural circuits responsible for deciding what an animal sees. However, behaviorally, confidence and perceptual decision accuracy are confounded; we are usually more confident about perceptual decisions when they are accurate. To tease them apart, we introduced a task with stimulus conditions that produced similar decision accuracy but different reports of subjective confidence. We decoded decision performance from neuronal signals in nonhuman primates in a subcortical region involved in decision-making, the superior colliculus (SC), and found that SC ensemble activity tracks decision accuracy, but not subjective confidence. These results challenge current ideas about how to measure subjective confidence in experiments and inspire ways to study its neuronal mechanisms.

Superior colliculus neuronal ensemble activity signals optimal rather than subjective confidence