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Related Experiment Video

Updated: Jul 28, 2025

Author Spotlight: An Accurate and Quantitative Approach to Study Visual Feature Selectivity of the Optokinetic Reflex in Mice
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Eye pupil signals life motion perception.

Yuhui Cheng1,2,3, Xiangyong Yuan4,5,6, Yi Jiang7,8,9

  • 1State Key Laboratory of Brain and Cognitive Science, CAS Center for Excellence in Brain Science and Intelligence Technology, Institute of Psychology, Chinese Academy of Sciences, Beijing, 100101, China.

Attention, Perception & Psychophysics
|May 31, 2023
PubMed
Summary

Pupil size increases when viewing upright biological motion (BM), indicating gravity influences perception. This pupillometry method could detect social cognition deficits related to BM perception.

Keywords:
Biological motionGravityLife motion detectorLocal motionPupil dilation

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Human Perception

Background:

  • Biological motion (BM) perception is crucial for survival and social interaction.
  • BM perception is significantly impaired when stimuli are inverted, a phenomenon known as the inversion effect.
  • The inversion effect is hypothesized to stem from a motion detection system attuned to gravity-compatible cues.

Purpose of the Study:

  • To investigate the inversion effect in biological motion (BM) perception using pupillometry.
  • To determine if pupillary responses can objectively reflect gravity-dependent perception of BM.
  • To explore the potential of pupillometry for identifying deficits in social cognition.

Main Methods:

  • Utilized a no-report pupillometry technique to measure pupil size changes.
  • Presented observers with both upright (gravity-compatible) and inverted (gravity-incompatible) biological motion stimuli.
  • Analyzed pupil size variations in response to different BM orientations and motion characteristics.

Main Results:

  • Significantly larger pupil sizes were observed when viewing upright BM compared to inverted BM.
  • The observed pupillary response to BM orientation was dependent on dynamic biological characteristics.
  • The inversion effect on pupil size extended to localized motion signals, such as foot movements.

Conclusions:

  • Pupil size objectively signals gravity-dependent perception of biological motion (BM).
  • Pupillometry offers a convenient, objective, and non-invasive method for assessing BM perception.
  • This approach holds potential for detecting deficiencies in life motion perception in individuals with socio-cognitive disorders.