Scotopic pattern-reversal visual evoked-potentials

Benedek, György and Janáky, Márta and Adamkovich, Nóra and Rubicsek, György and Sáry, Gyula (1993) Scotopic pattern-reversal visual evoked-potentials. CLINICAL VISION SCIENCES, 8 (1). pp. 47-54. ISSN 0887-6169

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1. Visual evoked potentials (VEPs) in response to pattern-reversal stimulation are generally recorded under photopic conditions. We have studied the VEPs in 22 healthy volunteers at stimulus intensities of between 4 x 10(-2) and 40 cd/m2 of Stimulus intensities. The scotopic pattern-reversal VEPs (sPVEPs) showed a primary positive component between 200 and 300 ms, depending on the stimulus intensity. The amplitude of the positive component was only slightly smaller than that of the photopic pattern-reversal VEP (pPVBP). 2. Dark adaptation induced a significant, albeit small-increase in the amplitude of the primary positive component. Significant differences were seen between the scalp distributions of the potential fields of VEPs recorded under scotopic and photopic conditions. 3. The topographical differences may be caused by the foveal vs extrafoveal contribution of the pPVEPs and sPVEPs, respectively. 4. Recording sPVEPs may offer a useful method for investigation of the physiological and clinical problems related to scotopic/peripheral vision

Item Type: Article
Subjects: R Medicine / orvostudomány > RC Internal medicine / belgyógyászat > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry / idegkórtan, neurológia, pszichiátria
R Medicine / orvostudomány > RE Ophthalmology / szemészet
Depositing User: MTMT SWORD
Date Deposited: 15 Jul 2013 08:41
Last Modified: 15 Jul 2013 08:41

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