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Related Experiment Video

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Visualizing Visual Adaptation
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Adaptation to number operates on perceived rather than physical numerosity.

M Fornaciai1, G M Cicchini2, D C Burr3

  • 1Department of Neuroscience, Psychology, Pharmacology and Child Health (NEUROFARBA), University of Florence, Via di San Salvi 12, 50139 Firenze, Italy.

Cognition
|March 18, 2016
PubMed
Summary

This study shows that our brain's number sense adapts to visual stimuli. Adaptation specifically impacts the perception of numerosity, not just general visual elements.

Keywords:
AdaptationNumberNumerosity discriminationSegmentationVision

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Area of Science:

  • Cognitive Neuroscience
  • Visual Perception
  • Psychophysics

Background:

  • Humans possess an innate number sense, enabling rapid estimation of quantities.
  • Numerosity perception, like other sensory attributes, is known to undergo adaptation.
  • It remains unclear if numerosity adaptation targets specific neural mechanisms or related processes like texture density.

Purpose of the Study:

  • To investigate whether adaptation affects neural mechanisms selective for numerosity.
  • To differentiate numerosity adaptation from adaptation in related visual processing pathways.

Main Methods:

  • Adaptation experiments were conducted using patterns of connected and unconnected dots.
  • Participants adapted to a 20-dot pattern before judging the numerosity of test patterns.
  • The effect of adaptation was measured on both connected and unconnected dot displays.

Main Results:

  • Adaptation to a 20-dot pattern significantly reduced the perceived numerosity of connected-dot patterns.
  • No significant reduction in perceived numerosity was observed for unconnected dot patterns after adaptation.
  • This suggests a specific adaptation mechanism for perceived numerosity.

Conclusions:

  • Numerosity adaptation operates on neural levels that encode perceived quantity, not just basic element detection.
  • Findings support the existence of dedicated neural mechanisms for processing numerosity.
  • This research clarifies the locus of adaptation within the visual processing hierarchy for number sense.