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Uncovering the Locus of Object-Context-Based Modulations in Depth Processing Using Repetitive Transcranial Magnetic

Nicole H L Wong1, Dorita H F Chang2,3

  • 1Department of Psychology, The University of Hong Kong, Hong Kong.

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|August 18, 2022
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Summary

Investigating depth perception, this study found that the dorsal visual area V7 is crucial for how object context influences stereosensitivity. Disrupting V7 with transcranial magnetic stimulation (TMS) eliminated context effects on depth discrimination.

Keywords:
depth processingobject processingtranscranial magnetic stimulation

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Computational Neuroscience

Background:

  • Neural responses in dorsal visual area V7 and the lateral occipital complex (LOC) correlate with depth sensitivity changes based on object context.
  • It remains unclear if context effects on behavior stem from early V7 depth responses or later LOC object representations influencing V7.

Purpose of the Study:

  • To investigate the roles of V7 and LOC in context-disparity interactions using online transcranial magnetic stimulation (TMS).
  • To determine whether V7 or LOC is critical for modulating depth sensitivity by object context.

Main Methods:

  • Used repetitive TMS over V7, LOC, or a control site (Cz) while participants performed depth and plausibility discrimination tasks.
  • Stimuli included disparity-defined geometric objects in random-dot stereograms, presented in plausible and implausible configurations.

Main Results:

  • TMS over LOC did not alter depth sensitivity compared to the control site.
  • Depth sensitivity was higher for implausible objects than plausible objects, consistent with prior findings.
  • TMS over V7 abolished the difference in depth sensitivity between plausible and implausible objects.

Conclusions:

  • V7 plays a key role in mediating changes in stereosensitivity due to object context.
  • V7 may reweigh stereoscopic information to influence object-motoric interactions, explaining context-dependent depth perception.