Amplitude Variability of the Steady-State Visual Evoked Response (VER)

Abstract

The reliability of steady-state visual evoked responses (VER's) was determined for nine normal subjects using Fourier analyses with 1.0 and 0.25 Hz bin resolutions. No correlations were found between VER amplitudes and subjects' reports of attention, accommodation, fixation, or perceived organization of the stimulus. Across subjects, there was also no sustained amplitude modulation of the VER by any frequency (including alpha), and frequency drift of the VER did not contribute significantly to tis amplitude variability. Modeling, using mixed sine waves to simulate different signal/noise (S/N) ratios, established that a significant portion of VER amplitude variability can be accounted for by noise which occurs at the same frequency as the VER and which is not removed by ensemble averaging.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1983
Accession Number
ADA135496

Entities

People

  • D. L. Schafer
  • R. A. Goodson
  • R. G. Allen
  • R. L. Yolton
  • W. D. Decker

Organizations

  • University of the Pacific

Tags

Communities of Interest

  • Materials and Manufacturing Processes
  • Space

DTIC Thesaurus Topics

  • Air Force
  • Amplitude Modulation
  • Artifacts
  • Computers
  • Electroencephalography
  • Electrophysiological Phenomena
  • Eye
  • Fourier Analysis
  • Mental Processes
  • Nervous System
  • Optics
  • Perception
  • Processing Equipment
  • Reliability
  • Simulations
  • Sine Waves
  • Steady State

Fields of Study

  • Psychology

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Vision Science/Vision Psychology/Cognitive Neuroscience.