An experiment is described which compared visual evoked potential (VEP) amplitudes and latencies in normal subjects and migraine patients. Several VEP abnormalities were found: at vertex and to a lesser extent at temporal sites, P100-N120 amplitudes were larger in patients; at vertex and temporal sites N120 amplitudes were larger in patients; at temporal sites patents had larger N120-P200 ampli...

Field sensitivities were measured under conditions of M- and L-cone isolation for seven infants (8-12 weeks-old) and two adults, using silent-substitution and the visually evoked potential (VEP). The efficacy of the receptor-isolation conditions were first verified by measuring psychophysical and VEP-derived action spectra from two color-normal adults under conditions of M- and L-cone isolation...

Visual evoked potentials is an important visual electrophysiological tool which has been used for the evaluation of visual field defects in primary open-angle glaucoma and is an appropriate objective measure of optic nerve function. Significant correlations between the magnitude of the VEP parameters and MD of Humphrey static perimetry suggest that the impaired visual cortical responses observe...

Field sensitivities were measured under conditions of Mand L-cone isolation for seven infants (8–12 weeks-old) and two adults, using silent-substitution and the visually evoked potential (VEP). The efficacy of the receptor-isolation conditions were first verified by measuring psychophysical and VEP-derived action spectra from two color-normal adults under conditions of Mand L-cone isolation. Ma...

A revised ISCEV standard for clinical electro-retinography has been published (1995). It is our concern that similar standards should be adopted for visual evoked potentials (VEP). The VEP is an electrophysiological signal that is recorded at the scalp, using standard EEG techniques. When used with other visual electrophysiological techniques the VEP can provide important diagnostic information...

The purpose of this study was to investigate the effects of sevoflurane concentration on canine visual evoked potentials with pattern stimulation (P-VEPs). Six clinically normal laboratory-beagle dogs were used. The minimum alveolar concentration (MAC) of sevoflurane was detected from all subjects by tail clamp method. The refractive power of the right eyes of all subjects was corrected to -2 d...

The joint realm of quantum mechanics and the general-relativistic description of gravitation is becoming increasingly accessible to terrestrial experiments and observations. In this essay we study the emerging indications of the violation of equivalence principle (VEP). While the solar neutrino anomaly may find its natural explanation in a VEP, the statistically significant discrepancy observed...

Introduction: Systemic hypertension or Essential hypertension is a major public health problem, though usually asymptomatic, hyperten-sion may leads to a number of complications involving almost all organ systems but its effects on brain contribute to the major part of morbidity and mortality.VEP and BERA have also been used to study changes in hypertensive patients. Method: In the present stud...

We made an electroretinographic (ERG) and visual evoked potential (VEP) study of 12 patients with Friedreich's ataxia whose diagnosis was established using the Quebec diagnostic criteria. ERGs and VEPs were elicited to the same stimulating conditions. Flash evoked luminance changes and pattern-specific evoked potentials to check and diamond stimuli were used. Statistical analysis of the data wa...

Email Hans Strasburger, et al. We decidedly agree with the conclusion of Souza et al.1 about the operation of two separate mechanisms in the VEP. We came in fact to a very similar conclusion in a paper in 1993 in Clinical Vision Sciences2 (available from our Web site). We there ascribed the non-linear, dichotomous characteristics of the VEP to putative sustained and transient mechanisms. The mo...