Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Signal to noise ratio considerations in the analysis of sweep visual-evoked potentials

Not Accessible

Your library or personal account may give you access

Abstract

More investigators are recommending rapid sweep displays to estimate visual-evoked potential (VEP) sensory thresholds. Theoretically, phase-sensitive analysis offers a higher signal to noise ratio (SNR) than phase-insensitive techniques and, therefore, a more reliable and equally valid threshold estimate. Phase-sensitive analysis assumes that the VEP phase does not change over the period of one sweep. This study tests the assertion that the VEP phase is sufficiently stable for valid and reliable phase-sensitive detection. Mathematical analysis shows that phase-sensitive detection yields a lower SNR than phase-insensitive analysis if the phase error is <45°. We recorded the VEP to contrast reversing sinusoidal gratings of sweeping spatial frequency (12.5–0.2 cpd) from 26 subjects. In most, phase varied >180° over one sweep. Moreover, these large phase shifts could not be diminished by modifying contrast reversal rate, direction of spatial frequency sweep, or sweep time. We conclude that when using spatial frequency sweeps, phase-insensitive detection is superior to phase-sensitive. The filter’s bandwidth and the effect of SNR on sensory threshold estimations also are discussed.

© 1988 Optical Society of America

Full Article  |  PDF Article
More Like This
Amplitude and phase characteristics of the steady-state visual evoked potential

Hans Strasburger, Wolfgang Scheidler, and Ingo Rentschler
Appl. Opt. 27(6) 1069-1088 (1988)

Evoked potential assessment of cortical adaptation

William Seiple, Mark Kupersmith, Jeremiah Nelson, and Ronald Carr
Appl. Opt. 27(6) 1089-1093 (1988)

Fractal analysis of steady-state-flicker visual evoked potentials: feasibility

Elmar T. Schmeisser
J. Opt. Soc. Am. A 10(7) 1637-1641 (1993)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (4)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (7)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved