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Cortical Resonance to Visible and Invisible Visual Rhythms

1
Laboratory of Action, Perception and Cognition, Vita-Salute San Raffaele University, 20132-Milan, Italy
2
Experimental Psychology Unit, Division of Neuroscience, IRCCS San Raffaele, 20132-Milan, Italy
Brain Sci. 2020, 10(1), 37; https://doi.org/10.3390/brainsci10010037
Received: 19 December 2019 / Revised: 2 January 2020 / Accepted: 5 January 2020 / Published: 9 January 2020
(This article belongs to the Special Issue ERP and EEG Markers of Brain Visual Attentional Processing)
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. View Full-Text
Keywords: perception; video; visual motion; speed; cortex; rhythm; entrainment perception; video; visual motion; speed; cortex; rhythm; entrainment
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de’Sperati, C. Cortical Resonance to Visible and Invisible Visual Rhythms. Brain Sci. 2020, 10, 37.

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