A shared numerical representation for action and perception

Author:

Anobile Giovanni12ORCID,Arrighi Roberto1ORCID,Togoli Irene1,Burr David Charles134ORCID

Affiliation:

1. Department of Neuroscience, Psychology, Pharmacology and Child Health, University of Florence, Florence, Italy

2. Department of Developmental Neuroscience, Stella Maris Scientific Institute, Pisa, Italy

3. Institute of Neuroscience, National Research Council, Pisa, Italy

4. School of Psychology, University of Western Australia, Perth, Australia

Abstract

Humans and other species have perceptual mechanisms dedicated to estimating approximate quantity: a sense of number. Here we show a clear interaction between self-produced actions and the perceived numerosity of subsequent visual stimuli. A short period of rapid finger-tapping (without sensory feedback) caused subjects to underestimate the number of visual stimuli presented near the tapping region; and a period of slow tapping caused overestimation. The distortions occurred both for stimuli presented sequentially (series of flashes) and simultaneously (clouds of dots); both for magnitude estimation and forced-choice comparison. The adaptation was spatially selective, primarily in external, real-world coordinates. Our results sit well with studies reporting links between perception and action, showing that vision and action share mechanisms that encode numbers: a generalized number sense, which estimates the number of self-generated as well as external events.

Funder

Ministero dell’Istruzione, dell’Università e della Ricerca

European Research Council

Ministero della Salute

Publisher

eLife Sciences Publications, Ltd

Subject

General Immunology and Microbiology,General Biochemistry, Genetics and Molecular Biology,General Medicine,General Neuroscience

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