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Related Experiment Video

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Measuring the Behavioral Effects of Intraocular Scatter
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How to test blindsight without light scatter artefacts?

Doris Schmid1, Sebastian Schneider1, Thomas Schenk1

  • 1Department of Psychology, Ludwig-Maximilians-Universität München, Leopoldstr. 13, 80802, Munich, Germany.

Neuropsychologia
|June 18, 2022
PubMed
Summary
This summary is machine-generated.

Light scatter artefacts can confound testing of residual visual capacities (RVCs) in patients with visual field defects. New stimulus and illumination conditions, specifically black targets on a grey background, avoid these artefacts in common RVC paradigms.

Keywords:
Blind spotBlindsightHemianopiaLight scatterMotion perceptionRedundant target effect

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Area of Science:

  • Visual neuroscience
  • Ophthalmology
  • Psychophysics

Background:

  • Light scatter artefacts pose a methodological challenge in assessing residual visual capacities (RVCs), such as blindsight, in individuals with homonymous visual field defects (HVFDs).
  • These artefacts occur when light from targets in the defective visual field strays into the intact visual field, potentially leading to accurate responses without true visual processing in the blind area.
  • Previous research on light scatter artefacts often involved small sample sizes and outdated equipment, limiting the generalizability of findings and necessitating repetitive testing for new studies.

Purpose of the Study:

  • To review the significance of light scatter in visual neuroscience.
  • To discuss factors influencing light scatter and evaluate methods for its detection.
  • To present empirical findings from a study developing RVC tests free from light scatter artefacts, establishing a pool of reliable stimuli and paradigms.

Main Methods:

  • Investigated 21 healthy participants across three common RVC paradigms: temporal 2AFC, movement direction discrimination, and redundant target paradigm.
  • Utilized the blind-spot method to detect light scatter artefacts.
  • Established sensitivity to light scatter by using conditions known to produce strong scatter (white targets on black background in a dark room) and a sensitive detection task (temporal 2AFC).

Main Results:

  • Confirmed light scatter artefacts under specific conditions: participants showed above-chance detection of white targets on a black background presented to the blind spot in a dark room.
  • Found no light scatter artefacts under other tested conditions: white targets on a grey background at the blind-spot position in an illuminated room yielded chance-level accuracy.
  • Determined that black targets on a grey background effectively eliminated light scatter artefacts across all three tested RVC paradigms.

Conclusions:

  • Identified specific stimulus (black targets) and illumination (grey background) conditions that prevent light scatter artefacts in frequently used RVC paradigms.
  • Provides researchers with a validated set of conditions to avoid light scatter artefacts without needing to conduct their own laborious blind-spot tests.
  • Enables more accurate and reliable assessment of residual visual capacities in patients with visual field defects.