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Related Experiment Videos

Steady-state visual evoked potentials to asymmetrical contrast.

P Bobak1, D Yates, J Goodwin

  • 1Eye and Ear Infirmary, Chicago, IL 60612.

Current Eye Research
|March 1, 1988
PubMed
Summary

The steady-state visual evoked response (VEP) shows that the first harmonic amplitude depends on mean contrast. The second harmonic

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Ophthalmology

Background:

  • Steady-state visual evoked response (VEP) temporal frequency components are influenced by stimulus presentation methods.
  • First harmonic VEP is generated by 'on-off' patterns, while second harmonic VEP occurs with both 'on-off' and counterphase patterns.

Purpose of the Study:

  • To investigate human VEP responses to visual patterns intermediate to 'on-off' and counterphase stimuli.
  • To determine the influence of mean contrast on VEP harmonic components when luminance and total contrast are controlled.

Main Methods:

  • Experimentally presented a 1 c/d sinusoidal grating phase-reversed sinusoidally at 8 Hz in human subjects.
  • Manipulated DC offset to create varying levels of peak contrast, altering mean contrast while keeping integrated luminance, local luminance, and total contrast constant.
  • Recorded VEPs and analyzed the amplitude and phase of the first and second harmonics.

Main Results:

  • The amplitude of the first harmonic in the VEP showed a strong dependence on mean contrast.
  • The amplitude and phase of the second harmonic remained relatively constant across different mean contrast conditions.
  • Supplementary experiments confirmed the phase constancy of the second harmonic at various temporal frequencies.

Conclusions:

  • Mean contrast is a critical factor influencing the first harmonic of the VEP.
  • The second harmonic's VEP response appears to be independent of mean contrast, suggesting a reliance on other constant stimulus attributes like luminance or total contrast.
  • These findings provide insights into the specific mechanisms underlying VEP generation for different visual stimuli.

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