Humans can optimally integrate sensory cues across different perceptual modalities in order to form a coherent percept (Ernst/Banks 2002). Here, we propose that optimal integration also occurs within a single perceptual modality. More specifically, we hypothesize that the perceived retinal speed of a translating intensity pattern results from a Bayesian integration of sensory signals across independent spatiotemporal frequency channels, combined with a prior expectation for slow speeds (Stocker/Simoncelli 2006).
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