Topic: Bayesian ideal observer model

Perceptual decision making is fraught with uncertainty that comes (at least) in two distinct forms: there can be uncertainty about how a stimulus is perceived, and even for a known stimulus there can be uncertainty about the decision that it licenses. Although putative neural correlates of uncertainty have been described in early sensory areas, these two forms of uncertainty have not been distinguished. Thus, it remains unknown whether and how perceptual uncertainty (presumably computed locally), as opposed to decision uncertainty (presumably computed downstream and conveyed by feedback connec

Saccades enable primates to sample their visual environments at high resolution. Yet, even before the saccade occurs, visual discrimination sensitivity increases at the saccade target location. Does this benefit occur in all scenarios? To address this question, we designed a dual-task paradigm involving visual change detection. On each trial, participants (n=10) prepared and executed a saccade to one (cued) of four grating locations while concurrently localizing a change in grating orientation that immediately preceded the saccade. Surprisingly, we found no improvement in orientation change de