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Related Experiment Video

Updated: May 2, 2026

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Hysteresis as an implicit prior in tactile spatial decision making.

Sabrina D Thiel1, Sebastian Bitzer2, Till Nierhaus3

  • 1Department of Neurology, Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig, Germany ; Department of Psychology, Faculty of Mathematics and Natural Sciences II, Humboldt-University, Berlin, Germany.

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Summary

Decision hysteresis, a form of implicit prior, influences tactile spatial perception. This effect becomes more significant when explicit stimulus evidence is weak, impacting decisions in tasks like the two-point discrimination test.

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Area of Science:

  • Neuroscience
  • Psychology
  • Sensory Perception

Background:

  • Perceptual decisions integrate sensory evidence with internal information from past experiences.
  • Prior knowledge plays a crucial role in decision-making, but its quantification and interplay with stimulus properties are less understood.
  • Hysteresis, the persistence of a percept despite stimulus changes, is known at perceptual thresholds.

Purpose of the Study:

  • To investigate if hysteresis acts as an implicit prior in tactile spatial decision-making.
  • To quantify the influence of decision hysteresis and its interaction with stimulus properties.
  • To examine the role of hysteresis in maintaining decision stability across successive stimuli.

Main Methods:

  • A modified classical two-point discrimination task was employed.
  • Participants made 'same' or 'different' judgments on successive pin distances.
  • The variance explained by stimulus properties versus hysteresis was compared.

Main Results:

  • Hysteresis was found to influence tactile spatial decisions, increasing 'same' responses.
  • Explicit stimulus properties, on average, explained more decision variance than hysteresis.
  • At stimulus thresholds, hysteresis showed a trend towards explaining more variance.
  • An inverse relationship was observed: less stimulus variance explained meant more hysteresis variance explained, and vice versa.

Conclusions:

  • Hysteresis functions as an implicit prior in tactile spatial decision-making.
  • The influence of hysteresis increases as explicit stimulus evidence diminishes.
  • This finding highlights the dynamic interplay between sensory evidence and internal priors in perception.