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Area of Science:

  • Cognitive Neuroscience
  • Psychophysics
  • Human Perception

Background:

  • Numerical and temporal information processing may stem from a shared magnitude system.
  • Previous research indicates duration adaptation affects numerosity perception.

Purpose of the Study:

  • Investigate how duration adaptation influences numerosity perception.
  • Differentiate between channel-based and strength-of-adaptation hypotheses.

Main Methods:

  • Two experiments were conducted manipulating adapter onset/offset duration, presentation time, and trial duration.
  • Tested effects of duration adaptation on numerosity discrimination.
  • Tested effects of numerosity and duration adaptation on numerosity discrimination.

Main Results:

  • Duration adaptation's impact on numerosity perception is mainly driven by duration/numerosity channels (channel-based hypothesis).
  • Numerosity adaptation's effect on numerosity perception is driven by total adaptation duration (strength-of-adaptation hypothesis).

Conclusions:

  • Adaptation of duration/numerosity channels significantly influences numerosity perception.
  • Two distinct temporal mechanisms contribute to numerosity perception.