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Spatial Frequency Tuning of Body Inversion Effects.

Giulia D'Argenio1,2, Alessandra Finisguerra3, Cosimo Urgesi2,3

  • 1PhD Program in Neural and Cognitive Sciences, Department of Life Sciences, University of Trieste, 34128 Trieste, Italy.

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|February 25, 2023
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Summary

Body inversion effects are stronger with high spatial frequencies (HSF), suggesting HSF information supports configural body processing. This effect is reduced in individuals with higher autistic traits, indicating a reliance on local details.

Keywords:
body inversion effectbody perceptionconfigural processingmagnocellularparvocellularspatial frequency

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Area of Science:

  • Cognitive Neuroscience
  • Visual Perception
  • Human Body Processing

Background:

  • Body inversion effects (BIEs) demonstrate configural processing of body stimuli.
  • BIEs involve body-selective areas in dorsal and ventral streams, sensitive to low (LSF) and high spatial frequencies (HSF).
  • The role of different spatial frequencies in configural body processing for gender and posture remains unclear.

Purpose of the Study:

  • To investigate the contribution of LSF and HSF to configural body processing along gender and posture dimensions.
  • To determine how spatial frequency bands influence body inversion effects.
  • To explore the relationship between autistic traits and spatial frequency exploitation in body perception.

Main Methods:

  • Seventy-two participants completed a delayed matching-to-sample task.
  • Stimuli included upright and inverted bodies, filtered for LSF or HSF, or presented intact.
  • Tasks involved gender and posture discrimination.

Main Results:

  • Gender discrimination performance improved with HSF images.
  • Posture discrimination performance was enhanced by both HSF and LSF images.
  • Greater BIEs were observed for HSF compared to LSF images in both tasks.
  • HSF exploitation for posture processing was reduced in individuals with higher autistic traits.

Conclusions:

  • Configural body processing, particularly BIEs, is better supported by HSF information, biasing ventral stream activity.
  • The findings suggest HSF information is crucial for configural processing of bodies, especially for gender.
  • Reduced HSF exploitation in individuals with autistic traits may indicate a preference for local feature processing.