Multisensory decisions provide support for probabilistic number representations

Journal of Neurophysiology
Ingmar KanitscheiderAnne K Churchland

Abstract

A large body of evidence suggests that an approximate number sense allows humans to estimate numerosity in sensory scenes. This ability is widely observed in humans, including those without formal mathematical training. Despite this, many outstanding questions remain about the nature of the numerosity representation in the brain. Specifically, it is not known whether approximate numbers are represented as scalar estimates of numerosity or, alternatively, as probability distributions over numerosity. In the present study, we used a multisensory decision task to distinguish these possibilities. We trained human subjects to decide whether a test stimulus had a larger or smaller numerosity compared with a fixed reference. Depending on the trial, the numerosity was presented as either a sequence of visual flashes or a sequence of auditory tones, or both. To test for a probabilistic representation, we varied the reliability of the stimulus by adding noise to the visual stimuli. In accordance with a probabilistic representation, we observed a significant improvement in multisensory compared with unisensory trials. Furthermore, a trial-by-trial analysis revealed that although individual subjects showed strategic differences in how they...Continue Reading

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Jul 13, 2016·Current Opinion in Behavioral Sciences·A K Churchland, R Kiani
Apr 14, 2016·PLoS Computational Biology·Adam N Sanborn, Ulrik R Beierholm
Nov 8, 2018·Scientific Reports·Saba GharaeiSamuel G Solomon

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