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Integrating Visual Psychophysical Assays within a Y-Maze to Isolate the Role that Visual Features Play in Navigational Decisions
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Collinear facilitation over space and depth.

Pi-Chun Huang1, Chien-Chung Chen, Christopher W Tyler

  • 1Department of Psychology, National Taiwan University, Taipei, Taiwan. pi-chun.huang@mcgill.ca

Journal of Vision
|February 23, 2012
PubMed
Summary
This summary is machine-generated.

Collinear flanking Gabors aid target detection, but disparity differences disrupt this. Surface differences, not disparity alone, abolish this collinear facilitation effect.

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Area of Science:

  • Vision science
  • Perceptual psychology
  • Computational neuroscience

Background:

  • Collinear flanking stimuli can enhance Gabor target detection.
  • This facilitation is disrupted by differences in disparity between target and flankers.

Purpose of the Study:

  • To investigate whether depth or surface differences disrupt collinear facilitation.
  • To determine if disparity or surface assignment is key to collinear facilitation disruption.

Main Methods:

  • Used Gabor patches (1.6 cycle/degree vertical) with varying disparities and spatial arrangements.
  • Employed a temporal 2-alternative forced choice (2AFC) paradigm with a Ψ staircase method.
  • Measured target contrast detection thresholds under six viewing conditions.

Main Results:

  • Strong collinear facilitation occurred when target and flankers were in the same frontoparallel plane.
  • Facilitation persisted when target and flankers were on the same slanted surface, despite disparity differences.
  • Disruption of facilitation was linked to differing surface assignments.

Conclusions:

  • Surface assignment, not disparity itself, is the critical factor disrupting collinear facilitation.
  • Visual system likely uses surface information to group elements and modulate facilitation.