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Selective attention operates on the group level for interactive biological motion.

Huichao Ji1, Jun Yin2, Yushang Huang1

  • 1Department of Psychology, Guangdong Provincial Key Laboratory of Social Cognitive Neuroscience and Mental Health, Sun Yat-Sen University.

Journal of Experimental Psychology. Human Perception and Performance
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Summary

Attention to interactive biological motion (BM) is grouped, not individual. Our study shows that people process interacting BM as a single unit, supporting the distribution-by-group hypothesis for attention distribution.

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Human Perception

Background:

  • Understanding how humans distribute attention to biological motion (BM) is crucial for explaining perceptual organization.
  • Two competing hypotheses exist: distribution-by-individual and distribution-by-group, concerning whether interactive BM is treated as separate entities or a unified whole.

Purpose of the Study:

  • To investigate whether interactive biological motion (BM) is processed as individual elements or integrated units within attentional distribution.
  • To test the distribution-by-group hypothesis against the distribution-by-individual hypothesis.

Main Methods:

  • A modified cueing paradigm was employed with participants observing four upright BM interacting in pairs or individually.
  • Participants performed a letter detection task (T or L) after a cue targeted one agent.
  • Experiment 2 used inverted BM to control for low-level feature confounds.

Main Results:

  • Performance was significantly better for probes on BM within the same interaction compared to those in different interactions.
  • This effect was absent in the unpaired condition, indicating interaction is key.
  • No performance difference was observed for inverted BM, ruling out low-level feature influence.

Conclusions:

  • Interactive biological motion (BM) is treated as an elementary unit for attention distribution.
  • The findings support the distribution-by-group hypothesis, demonstrating that perceived interactions integrate BM into a single attentional focus.