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Rate after-effects fail to transfer cross-modally: Evidence for distributed sensory timing mechanismsMotala, A., Heron, James, McGraw, Paul V., Roach, N.W., Whitaker, David J. 17 January 2018 (has links)
Yes / Accurate time perception is critical for a number of human behaviours, such as understanding speech
and the appreciation of music. However, it remains unresolved whether sensory time perception is
mediated by a central timing component regulating all senses, or by a set of distributed mechanisms,
each dedicated to a single sensory modality and operating in a largely independent manner. To address
this issue, we conducted a range of unimodal and cross-modal rate adaptation experiments, in order
to establish the degree of specificity of classical after-effects of sensory adaptation. Adapting to a fast
rate of sensory stimulation typically makes a moderate rate appear slower (repulsive after-effect), and
vice versa. A central timing hypothesis predicts general transfer of adaptation effects across modalities,
whilst distributed mechanisms predict a high degree of sensory selectivity. Rate perception was
quantified by a method of temporal reproduction across all combinations of visual, auditory and tactile
senses. Robust repulsive after-effects were observed in all unimodal rate conditions, but were not
observed for any cross-modal pairings. Our results show that sensory timing abilities are adaptable but,
crucially, that this change is modality-specific - an outcome that is consistent with a distributed sensory
timing hypothesis.
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