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Cortical Resonance to Visible and Invisible Visual Rhythms

Humans are rather poor in judging the right speed of video scenes. For example, a soccer match may be sped up so as to last only 80 min without observers noticing it. However, both adults and children seem to have a systematic, though often biased, notion of what should be the right speed of a given...

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Autor principal: de’Sperati, Claudio
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7017096/
https://www.ncbi.nlm.nih.gov/pubmed/31936464
http://dx.doi.org/10.3390/brainsci10010037
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author de’Sperati, Claudio
author_facet de’Sperati, Claudio
author_sort de’Sperati, Claudio
collection PubMed
description Humans are rather poor in judging the right speed of video scenes. For example, a soccer match may be sped up so as to last only 80 min without observers noticing it. However, both adults and children seem to have a systematic, though often biased, notion of what should be the right speed of a given video scene. We therefore explored cortical responsiveness to video speed manipulations in search of possible differences between explicit and implicit speed processing. We applied sinusoidal speed modulations to a video clip depicting a naturalistic scene as well as a traditional laboratory visual stimulus (random dot kinematogram, RDK), and measured both perceptual sensitivity and cortical responses (steady-state visual evoked potentials, SSVEPs) to speed modulations. In five observers, we found a clear perceptual sensitivity increase and a moderate SSVEP amplitude increase with increasing speed modulation strength. Cortical responses were also found with weak, undetected speed modulations. These preliminary findings suggest that the cortex responds globally to periodic video speed modulations, even when observers do not notice them. This entrainment mechanism may be the basis of automatic resonance to the rhythms of the external world.
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spelling pubmed-70170962020-02-28 Cortical Resonance to Visible and Invisible Visual Rhythms de’Sperati, Claudio Brain Sci Communication Humans are rather poor in judging the right speed of video scenes. For example, a soccer match may be sped up so as to last only 80 min without observers noticing it. However, both adults and children seem to have a systematic, though often biased, notion of what should be the right speed of a given video scene. We therefore explored cortical responsiveness to video speed manipulations in search of possible differences between explicit and implicit speed processing. We applied sinusoidal speed modulations to a video clip depicting a naturalistic scene as well as a traditional laboratory visual stimulus (random dot kinematogram, RDK), and measured both perceptual sensitivity and cortical responses (steady-state visual evoked potentials, SSVEPs) to speed modulations. In five observers, we found a clear perceptual sensitivity increase and a moderate SSVEP amplitude increase with increasing speed modulation strength. Cortical responses were also found with weak, undetected speed modulations. These preliminary findings suggest that the cortex responds globally to periodic video speed modulations, even when observers do not notice them. This entrainment mechanism may be the basis of automatic resonance to the rhythms of the external world. MDPI 2020-01-09 /pmc/articles/PMC7017096/ /pubmed/31936464 http://dx.doi.org/10.3390/brainsci10010037 Text en © 2020 by the author. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Communication
de’Sperati, Claudio
Cortical Resonance to Visible and Invisible Visual Rhythms
title Cortical Resonance to Visible and Invisible Visual Rhythms
title_full Cortical Resonance to Visible and Invisible Visual Rhythms
title_fullStr Cortical Resonance to Visible and Invisible Visual Rhythms
title_full_unstemmed Cortical Resonance to Visible and Invisible Visual Rhythms
title_short Cortical Resonance to Visible and Invisible Visual Rhythms
title_sort cortical resonance to visible and invisible visual rhythms
topic Communication
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7017096/
https://www.ncbi.nlm.nih.gov/pubmed/31936464
http://dx.doi.org/10.3390/brainsci10010037
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