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How Untidiness Moves the Motor System.

Francesca Fiori1,2, Andrea Ciricugno3, Maria Luisa Rusconi4

  • 1Department of Psychology, 9305University of Milano-Bicocca, Milano, Italy.

Perceptual and Motor Skills
|April 20, 2022
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Summary

Disorderly environments reduce corticospinal excitability, suggesting a physiological preparation to restore order. This effect is pronounced in individuals with obsessive-compulsive traits, linking sensorimotor responses to environmental order.

Keywords:
Motor evoked potentialsTMSauditory perceptioncorticospinal excitabilityembodied cognitionvisual perception

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Human Behavior

Background:

  • Humans exhibit a preference for order, finding comfort and efficiency in predictable environments.
  • Disorderly environments can trigger a natural tendency to restore order, potentially influencing physiological responses.
  • Corticospinal excitability, linked to motor preparation, is a potential physiological marker for this order restoration tendency.

Purpose of the Study:

  • To investigate if viewing disordered environments modulates corticospinal excitability.
  • To determine if changes in corticospinal excitability reflect a physiological index of order restoration.
  • To explore the relationship between individual differences in obsessive-compulsive traits and responses to environmental disorder.

Main Methods:

  • Participants viewed images of ordered and disordered rooms.
  • Corticospinal excitability was measured using motor-evoked potentials (MEPs) via single-pulse transcranial magnetic stimulation (TMS).
  • MEP amplitudes were analyzed to assess changes in motor cortex excitability.

Main Results:

  • Viewing disordered environments led to suppressed corticospinal excitability.
  • This suppression aligns with known associations between decreased corticospinal excitability and motor preparation.
  • Individuals with subclinical obsessive-compulsive traits showed a more pronounced suppression of corticospinal excitability.

Conclusions:

  • Disorderly environments may physiologically prime the motor system for order restoration.
  • Sensorimotor preparation for re-establishing order can be observed through corticospinal excitability.
  • Obsessive-compulsive traits may influence the sensitivity of the motor system to environmental disorder.