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Spontaneous perception of numerosity in humans
Guido Marco Cicchini1, Giovanni Anobile2,3, David C Burr1,2,4
1Institute of Neuroscience, National Research Council, 56124 Pisa, Italy.
Nature Communications
|August 25, 2016
Summary
Humans possess an innate ability to perceive number, or numerosity, directly and spontaneously. This number perception system is distinct from those processing visual density or area, indicating dedicated neural mechanisms.
Area of Science:
- Cognitive psychology
- Neuroscience
- Perception science
Background:
- Humans and other species can estimate numerosity nonverbally.
- The underlying mechanisms of number perception remain debated, with theories involving density estimation versus dedicated systems.
Purpose of the Study:
- To investigate whether number perception relies on dedicated mechanisms or density/area estimations.
- To determine human sensitivity to numerosity versus density and area.
Main Methods:
- Participants performed tasks involving visual stimuli varying in numerosity, density, and area.
- Judgments were analyzed for sensitivity to each of these parameters, even when participants were instructed otherwise.
Main Results:
- Human subjects showed significantly higher sensitivity to numerosity than to density or area.
- Participants spontaneously responded to numerosity, even when instructed to judge density or area.
Conclusions:
- Number information is extracted directly and spontaneously by dedicated mechanisms in the human brain.
- This finding supports the existence of specialized neural systems for number perception, separate from visual texture processing.
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