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The timecourse of expression aftereffects.

Nichola Burton1, Linda Jeffery2, Jack Bonner3

  • 1ARC Centre of Excellence in Cognition and its Disorders, School of Psychology, University of Western Australia, WA, Australianichola.burton@uwa.edu.auhttp://www.psychology.uwa.edu.au/research.

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Facial expression aftereffects adapt quickly and decay slowly, similar to basic visual stimuli. These aftereffects, influencing perception, can persist for over 30 seconds, impacting daily experiences.

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Area of Science:

  • Psychology
  • Neuroscience
  • Visual Perception

Background:

  • Adaptation to facial expressions causes aftereffects, biasing perception away from the adaptor.
  • Understanding the temporal dynamics of these aftereffects is crucial for comprehending neural processes in perception and experience-dependent changes.

Purpose of the Study:

  • To investigate the temporal dynamics and timecourse of the facial expression aftereffect.
  • To determine how adaptation duration and stimulus presentation influence the aftereffect's magnitude and longevity.

Main Methods:

  • Two experiments were conducted to measure the timecourse of the expression aftereffect.
  • Experiment 1 varied adaptor and test stimulus durations.
  • Experiment 2 introduced stimulus-free gaps to assess aftereffect persistence.

Main Results:

  • The expression aftereffect exhibited a classic logarithmic build-up and exponential decay pattern.
  • Aftereffects were induced by as little as 1 second of adaptation and lasted up to 3200 ms.
  • Significant aftereffects persisted for over 32 seconds even after a stimulus-free gap.

Conclusions:

  • The temporal dynamics of facial expression aftereffects mirror those of lower-level visual stimuli, suggesting similar adaptive calibration mechanisms.
  • These findings support a perceptual locus for the adaptation aftereffect.
  • The long-lasting nature of expression aftereffects indicates a substantial influence on everyday facial expression perception.