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Visual discomfort and flicker.

Sanae Yoshimoto1, Jesel Garcia2, Fang Jiang2

  • 1School of Psychology, Chukyo University, Showa-ku Yagotohonmachi 101-2, Nagoya, Aichi 466-8666, Japan; Department of Psychology, University of Nevada, Reno, 1664 N. Virginia Street, Reno, NV 89557, USA.

Vision Research
|July 16, 2017
PubMed
Summary
This summary is machine-generated.

Visual discomfort from flickering lights is linked to deviations from natural temporal patterns. Both amplitude and phase spectra significantly influence perceived discomfort, not just regularity.

Keywords:
Amplitude spectrumFlickerNatural image statisticsPhase spectrumTemporal frequencyVisual discomfort

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Area of Science:

  • Visual Perception
  • Neuroscience
  • Image Processing

Background:

  • Flickering lights can cause visual discomfort and seizures in individuals with photosensitive epilepsy.
  • Spatial visual discomfort is associated with deviations from natural scene statistics (e.g., 1/f amplitude spectra).
  • The temporal characteristics influencing flicker discomfort are not fully understood.

Purpose of the Study:

  • To investigate the temporal characteristics of light flicker that contribute to visual discomfort.
  • To explore the analogous effects of temporal Fourier amplitude and phase spectra to spatial visual discomfort.
  • To determine how deviations from natural temporal spectra influence perceived discomfort.

Main Methods:

  • Participants judged the discomfort of temporal luminance variations in uniform visual fields.
  • Temporal modulations were manipulated by altering both amplitude and phase spectra.
  • Judgments of discomfort were compared with ratings of perceived naturalness.

Main Results:

  • Discomfort increased with deviations from natural amplitude spectra, especially with excess energy at medium frequencies.
  • Discomfort ratings correlated with perceived naturalness of the temporal modulations.
  • Phase spectra significantly impacted discomfort judgments, with fixed vs. random spectra yielding different responses.

Conclusions:

  • Visual discomfort from temporal patterns depends on similarity to natural visual environment's amplitude spectra.
  • The phase spectrum of flicker plays a critical role in perceived visual discomfort.
  • Factors beyond perceived regularity influence temporal discomfort.