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• W2189244016 abstract "In this study, the pattern-reversal visual evoked potentials (PRVEP's) collected from normal and demented sub- jects are investigated by applying the quadratic spline wavelet analysis. The data are decomposed into six octave frequency bands. For quantitative purposes, the wavelet coefficients in the residual waveform representing the delta-theta band activity (0-8 Hz) are explored to characterize the (N70-P100-N130) complex. Specifically, the coefficients corresponding to the location of N70, P100, and N130 peaks are investigated for their sign in order to test whether they represent a consistent (N70-P100-N130) complex in the averaged waveform. Waveforms with normal latency (N70-P100-N130) complex are observed to have positive second, negative third, and positive fourth coefficients in ampli- tude in their residual scale standing for the delta-theta (0-8 Hz) band activity. The method allows for the analysis of oscillatory- phase behavior of the normal and pathological PRVEP's in their delta-theta band based on a few quantitative measures consistent with the time-frequency occurrence of the major components of the evoked potential. (47) have used an adaptive approach to spectral analysis of pattern-reversal visual evoked potentials (PRVEP's). This was achieved with the use of tunable spectral windows prior to transformation. The Ia-sinh (Kaiser) window was found to be most effective when compared with the Gaussian and the cosine-taper windows. Studies on EEG and visual evoked potential (VEP) analysis are also important in the clinical diagnosis of dementia since these tests are noninvasive and inexpensive. Alzheimer's dis- ease, the most common cause of dementia, is a degenerative disease of the cerebral cortex and subcortical structures. The relative severity of the pathological changes in the associative cortex accounts for the clinical finding of diminished visual interpretation skills with normal visual acuity. Impairment of visuo-cognitive skills is commonly found in this disease, i.e., the patients may have difficulties with a variety of complex visual tasks, such as tracing a target figure embedded in a more complex figure, or identifying single letters that are presented briefly and followed by a patterned masking stimulus. EEG abnormalities are very common in Alzheimer's disease and take the form of a decrease in alpha activity with replacement by theta, and eventually delta activity (10)-(14). A more specific indicator of dementia may be the VEP. Several different studies have found that flash VEP's are abnormal while pattern VEP's are normal in patients with Alzheimer's disease. The most consistent abnormality in the flash VEP" @default.
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• W2189244016 date "1997-01-01" @default.
• W2189244016 modified "2023-09-26" @default.
• W2189244016 title "Analysis of Pattern Reversal Visual Evoked" @default.
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