Scientific reports

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2045-23221012020May26Scientific reportsSci RepTemporal rate is not a distinct perceptual metric.86548654865410.1038/s41598-020-64984-4Sensory adaptation experiments have revealed the existence of 'rate after-effects' - adapting to a relatively fast rate makes an intermediate test rate feel slow, and adapting to a slow rate makes the same moderate test rate feel fast. The present work aims to deconstruct the concept of rate and clarify how exactly the brain processes a regular sequence of sensory signals. We ask whether rate forms a distinct perceptual metric, or whether it is simply the perceptual aggregate of the intervals between its component signals. Subjects were exposed to auditory or visual temporal rates (a 'slow' rate of 1.5 Hz and a 'fast' rate of 6 Hz), before being tested with single unfilled intervals of varying durations. Results show adapting to a given rate strongly influences the perceived duration of a single empty interval. This effect is robust across both interval reproduction and duration discrimination judgments. These findings challenge our understanding of rate perception. Specifically, they suggest that contrary to some previous assertions, the perception of sequence rate is strongly influenced by the perception of the sequence's component duration intervals.MotalaAyshaA0000-0003-0279-4628School of Optometry and Vision Sciences, Cardiff University, Cardiff, CF24 4HQ, UK. amotala2@uwo.ca.Brain and Mind Institute, Western University, London, ON, N6A 5B7, Canada. amotala2@uwo.ca.HeronJamesJ0000-0003-3857-5056Bradford School of Optometry and Vision Science, University of Bradford, Bradford, BD7 1DP, UK.McGrawPaul VPVVisual Neuroscience Group, School of Psychology, University of Nottingham, Nottingham, NG7 2RD, UK.RoachNeil WNW0000-0002-4155-745XVisual Neuroscience Group, School of Psychology, University of Nottingham, Nottingham, NG7 2RD, UK.WhitakerDavidDSchool of Optometry and Vision Sciences, Cardiff University, Cardiff, CF24 4HQ, UK. whitakerd@cardiff.ac.uk.engWT097387WT_Wellcome TrustUnited KingdomJournal ArticleResearch Support, Non-U.S. Gov't20200526

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