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Trends Cogn Sci. 2016 Oct;20(10):723-735. doi: 10.1016/j.tics.2016.07.006. Epub 2016 Aug 23.

Perceptual Cycles.

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Centre National de la Recherche Scientifique (CNRS), Unité Mixte de Recherche 5549, Faculté de Médecine Purpan, Toulouse, France; Université de Toulouse, Centre de Recherche Cerveau et Cognition, Université Paul Sabatier, Toulouse, France. Electronic address:


Brain function involves oscillations at various frequencies. This could imply that perception and cognition operate periodically, as a succession of cycles mirroring the underlying oscillations. This age-old notion of discrete perception has resurfaced in recent years, fueled by advances in neuroscientific techniques. Contrary to earlier views of discrete perception as a unitary sampling rhythm, contemporary evidence points not to one but several rhythms of perception that may depend on sensory modality, task, stimulus properties, or brain region. In vision, for example, a sensory alpha rhythm (∼10Hz) may coexist with at least one more rhythm performing attentional sampling at around 7Hz. How these multiple periodic functions are orchestrated, and how internal sampling rhythms coordinate with overt sampling behavior, remain open questions.


attention; discrete perception; oscillations; rhythms; sampling

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