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  The shape of things to come: temporal recalibration changes responses to unisensory stimuli

Horr, N., Di Luca, M., Barnett-Cowan, M., & Ernst, M. (2014). The shape of things to come: temporal recalibration changes responses to unisensory stimuli. Poster presented at 15th International Multisensory Research Forum (IMRF 2014), Amsterdam, The Netherlands.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-329E-5 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-C77D-E
Genre: Poster

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Horr, NK, Author
Di Luca, M1, 2, Author              
Barnett-Cowan, M1, 2, Author              
Ernst, MO1, 2, Author              
Affiliations:
1Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497794              
2Department Human Perception, Cognition and Action, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497797              

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 Abstract: If the audio and visual stream in a movie are poorly aligned the discrepancy between the actors’ speech and lip movements are very disturbing in the beginning. However, after a short time the constant delay in one modality becomes barely noticeable. This phenomenon is termed temporal recalibration, that is, the adaptation of synchrony perception to multisensory asynchronies in the environment. Here, we investigate whether and how temporal recalibration may be achieved via adaptation of the response towards unisensory stimuli. To this aim, we exposed participants to three minutes of either -150, 0 or +150ms audiovisual asynchrony. Subsequently, we tested participants’ unisensory detection threshold, reaction time, and gap detection. We observe remarkable changes with auditory-only trials following visual-leading audiovisual exposure: increases in detection threshold (i.e., sensitivity is lower), faster reactions, and improved gap detection performance. We do not find effects of adaptation using visual stimuli. These findings indicate that asynchronous exposure leads to changes in the neural response to unisensory stimuli. We suggest that such changes are the precursors of temporal recalibration: For the delayed stimulus during exposure accumulation of sensory evidence becomes higher early after stimulus onset, which, in accordance with a negative feedback mechanism, has the cost of an overall lowering of activation compared to the stimulus leading during exposure.

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 Dates: 2014-06
 Publication Status: Published in print
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 Identifiers: BibTex Citekey: HorrDBE2014
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Title: 15th International Multisensory Research Forum (IMRF 2014)
Place of Event: Amsterdam, The Netherlands
Start-/End Date: 2014-06-11 - 2014-06-14

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Title: 15th International Multisensory Research Forum (IMRF 2014)
Source Genre: Proceedings
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Pages: - Volume / Issue: - Sequence Number: - Start / End Page: 120 Identifier: -