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Biomedical subjects

J Peregrin

Publications and source records attributed to J Peregrin.

At least 109 records · Page 6Linked to original sources
PubMed1984

Visual evoked responses to pattern-reversal: the signal-to-noise ratio.

Visual evoked responses (VERs) to checkboard-reversal photic stimuli were recorded in 30 healthy experimental subjects with a mean age of 32 years. In 20 cases the stimuli were presented monocularly and in 10 cases binocularly. The estimated mean signal-to-noise ratio (SNR) of the individual VERs was found to be 0.245 +/- 0.092 for monocular stimulation and 0.444 +/- 0.23 for binocular stimulation. The power-based SNR of the averaged VERs was 24.5 and 44.4 respectively. The SNR was raised the most effectively by a new selective averaging variant applied after latency correction of the individual VERs; in the case of monocular stimulation the SNR rose to a mean 58.94 and in binocular stimulation to a mean 87.42. The mean proportion of discarded single VERs was 24%.

Adolescent↗
PubMed1983

Pattern-reversal visual evoked potentials in patients with chronic renal insufficiency.

Visual evoked potentials (VEPs) were recorded from 88 patients with chronic renal insufficiency twice at a 6 month interval. In dialysed patients statistically significant decreases in amplitudes and prolongations of VEP peak latencies were found. Azotaemic non-dialysed patients showed related, but smaller, changes in their VEPs. In patients after kidney transplantation the VEP amplitudes were normal but peak latencies were prolonged. No systematic significant relationship between the VEPs and creatinine and urea levels in the blood could be shown.

Brain↗
PubMed1982

Visual evoked responses to reversal stimulation in the upper and lower half of the central part of the visual field in man.

Differences in visual evoked responses (VER) to three types of stimuli were studied in 70 volunteers, using checkerboard pattern reversal stimulation--a circular target in the central part of the visual field (VF) and stimuli composed of either the upper or the lower half of the circle. The responses to semicircular stimulation displayed great variability (latency shifts, reverse polarity, absence of a response), particularly to the upper half of the circle, where the amplitude of the responses was significantly smaller and their latency longer than in lower semicircle and whole circle stimulation.

Adult↗