The pupil responds spontaneously to perceived numerosity

Elisa Castaldi, Antonella Pomè, Guido Marco Cicchini, David Burr () and Paola Binda
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Elisa Castaldi: University of Pisa
Antonella Pomè: University of Florence
Guido Marco Cicchini: Institute of Neuroscience, National Research Council
David Burr: University of Florence
Paola Binda: University of Pisa

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract Although luminance is the main determinant of pupil size, the amplitude of the pupillary light response is also modulated by stimulus appearance and attention. Here we ask whether perceived numerosity modulates the pupillary light response. Participants passively observed arrays of black or white dots of matched physical luminance but different physical or illusory numerosity. In half the patterns, pairs of dots were connected by lines to create dumbbell-like shapes, inducing an illusory underestimation of perceived numerosity; in the other half, connectors were either displaced or removed. Constriction to white arrays and dilation to black were stronger for patterns with higher perceived numerosity, either physical or illusory, with the strength of the pupillary light response scaling with the perceived numerosity of the arrays. Our results show that even without an explicit task, numerosity modulates a simple automatic reflex, suggesting that numerosity is a spontaneously encoded visual feature.

Date: 2021
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DOI: 10.1038/s41467-021-26261-4

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