Comparison of the reliability of multifocal visual evoked cortical potentials generated by pattern reversal and pattern pulse stimulation
نویسندگان
چکیده
منابع مشابه
Comparison of the reliability of multifocal visual evoked cortical potentials generated by pattern reversal and pattern pulse stimulation
This study compared the effectiveness of the multifocal visual evoked cortical potentials (mfVEP) elicited by pattern pulse stimulation with that of pattern reversal in producing reliable responses (signal-to-noise ratio >1.359). Participants were 14 healthy subjects. Visual stimulation was obtained using a 60-sector dartboard display consisting of 6 concentric rings presented in either pulse o...
متن کاملThe pattern-pulse multifocal visual evoked potential.
PURPOSE To define the pattern-pulse multifocal visual evoked potential (PPMVEP) and determine its characteristics in a sample of normal subjects in terms of amplitude of response attainable, the variation in waveform across visual field, and distribution of potential over the scalp and to compare pattern-pulse with contrast-reversal multifocal stimuli. METHODS VEPs were obtained by concurrent...
متن کاملSimulated nystagmus reduces pattern-reversal more strongly than pattern-onset multifocal visual evoked potentials.
OBJECTIVE In patients with nystagmus conventional pattern-reversal visual evoked potentials are severely degraded, while sizeable pattern-onset VEPs can often still be obtained. We tested whether this differential effect of retinal image motion on pattern-reversal and pattern-onset responses also applies to multifocal VEPs (mfVEPs). METHODS In eight subjects with normal oculomotor behaviour a...
متن کاملImpact of eye-dominance on pattern reversal visual evoked potentials
Background and Objectives: Ocular dominance refers to the tendency to prefer visual input from one eye to the other and is found in majority of the individuals. The role of eye dominance as one of the confounding physiologic variables affecting the PRVEP (pattern reversal visual evoked potential) responses needs to be evaluated. Hence, the present study was planned to assess the influence of ey...
متن کاملValue of hyperventilation in pattern-reversal visual evoked potentials.
The effects of a standard 3 minutes' hyperventilation on the full-field pattern-reversal visual evoked potential (VEP) were studied in 33 normal subjects, 30 definite multiple sclerosis patients and in twenty-five patients with abnormal VEPs due to either tumourous compression of the anterior visual pathways or optic atrophy of other origin. Significantly greater reductions in P100 latency occu...
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ژورنال
عنوان ژورنال: Brazilian Journal of Medical and Biological Research
سال: 2012
ISSN: 0100-879X
DOI: 10.1590/s0100-879x2012007500112