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Action Enhances Predicted Touch.

Emily R Thomas1, Daniel Yon1,2, Floris P de Lange3

  • 1Department of Psychological Sciences, Birkbeck, University of London.

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Summary
This summary is machine-generated.

Predicted tactile sensations are not always attenuated. New research shows that expectations can enhance tactile perception, challenging established motor control theories and suggesting predictions influence touch differently than previously thought.

Keywords:
attenuationmotor processesperceptionprediction

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Sensory Perception

Background:

  • A prevailing view suggests that predicted tactile outcomes of actions are perceptually attenuated.
  • However, it remains unclear if predictive mechanisms inherently cause attenuation or can enhance perception, as seen in other sensory domains.

Purpose of the Study:

  • To investigate whether predictive mechanisms in tactile perception necessarily lead to attenuation or can instead enhance sensory experience.
  • To challenge the notion that sensorimotor predictions have a unique influence on tactile perception.

Main Methods:

  • Adult participants performed actions and then rated the intensity of forces applied to a static finger.
  • Probabilistic expectations were manipulated using a paradigm commonly employed to demonstrate tactile attenuation.
  • Computational modeling was used to analyze the effect of expectations on tactile signal gain.

Main Results:

  • Experiment 1 replicated findings of tactile attenuation but also showed enhanced perception when active stimulation was removed.
  • Experiments 2 and 3 demonstrated that expected touch during action is perceived more intensely than unexpected touch.
  • Computational models indicated that expectations amplify the gain of expected tactile signals.

Conclusions:

  • Sensorimotor predictions do not exclusively result in perceptual attenuation; they can also enhance tactile perception.
  • These findings contradict central tenets of prominent motor control theories regarding predictive processing in action.
  • The influence of sensorimotor predictions on tactile perception is not qualitatively distinct from other cognitive predictions.