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Depth Perception and Spatial Vision01:15

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Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.
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Using Functional Near Infrared Spectroscopy (fNIRS) to Study Dynamic Stereoscopic Depth Perception.

Laura M Ward1, Gordon Morison2, William A Simpson3

  • 1Department of Vision Sciences, Glasgow Caledonian University, 70 Cowcaddens Road, Glasgow, G4 0BA, UK.

Brain Topography
|February 23, 2016
PubMed
Summary
This summary is machine-generated.

Functional near-infrared spectroscopy (fNIRS) revealed that the right parieto-occipital cortex shows increased oxygenated hemoglobin ([HbO]) during depth perception. This study validates fNIRS for investigating visual processing of complex stimuli.

Keywords:
Binocular disparityDepth perceptionHaemodynamic responseRandom dot stereogramfNIRS

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Visual Perception

Background:

  • The parietal cortex is crucial for depth perception, but functional near-infrared spectroscopy (fNIRS) is underutilized for studying its role.
  • Hemodynamic responses (HDR), specifically changes in oxy- ([HbO]) and de-oxyhaemoglobin ([HbR]), are key indicators of neural activity.

Purpose of the Study:

  • To investigate the hemodynamic response (HDR) associated with depth perception using fNIRS.
  • To examine the role of the parieto-occipital and occipital cortices in processing induced depth using dynamic random-dot-stereograms (RDS).

Main Methods:

  • Utilized fNIRS to measure [HbO] and [HbR] in 13 healthy young adults.
  • Employed a blocked design with dynamic RDS, contrasting stimuli with and without binocular disparity to induce depth perception.
  • Recorded HDR across parieto-occipital and occipital cortices.

Main Results:

  • A significant effect of depth stimulation was observed in the right parieto-occipital cortex (p < 0.01).
  • Depth perception significantly increased [HbO] in the right parieto-occipital cortex compared to the control stimulus (p < 0.001).
  • No significant HDR changes were detected in the occipital cortex, possibly due to stimulus similarity.

Conclusions:

  • Cerebral oxygenation measures ([HbO]) confirm the strong association of the right parieto-occipital cortex with depth perception processing.
  • fNIRS is a valid tool for investigating hemodynamic responses during high-level visual processing of complex stimuli like RDS.