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A visual sense of number
1Dipartimento di Psicologia, Università Degli Studi di Firenze, Via S. Nicolò 89, Florence 50125, Italy. dave@in.cnr.it
Current Biology : CB
|March 18, 2008
Summary
The human brain can perceive number without language. This study shows that our perception of how many objects we see (numerosity) adapts like other visual traits, suggesting it
Area of Science:
- Cognitive Neuroscience
- Visual Perception
- Comparative Psychology
Background:
- Nonverbal number apprehension is documented in humans, including infants, and other primates.
- Primary visual properties like color and contrast are known to adapt within the visual system.
Purpose of the Study:
- To investigate if perceived numerosity is subject to adaptation, similar to other visual properties.
- To determine if numerosity is an independent visual property.
Main Methods:
- Participants were exposed to adapting stimuli with varying numbers of dots.
- Perceived numerosity of test stimuli was assessed after adaptation.
- Adaptation effects were analyzed concerning dot numerosity, contrast, size, orientation, and pixel density.
Main Results:
- Perceived numerosity adapted to the numerosity of the adaptor stimuli.
- Adaptation to numerous dots decreased apparent numerosity; adaptation to few dots increased it.
- The effect was independent of non-numerosity visual features like contrast and size, occurring even at low adaptor contrasts.
Conclusions:
- The visual system possesses an independent capacity for estimating numerosity.
- Numerosity is a primary visual property, not reducible to other visual attributes like texture density or spatial frequency.
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