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STIMULUS ALTERNATION AND FAST RETINAL POTENTIALS: PHOTOPIC AND SCOTOPIC CONTRIBUTIONS *
Author(s) -
KORTH MATTHIAS,
REIMAN VIKTOR
Publication year - 1979
Publication title -
acta ophthalmologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.534
H-Index - 87
eISSN - 1755-3768
pISSN - 1755-375X
DOI - 10.1111/j.1755-3768.1979.tb01820.x
Subject(s) - scotopic vision , photopic vision , stimulus (psychology) , amplitude , retinal , physics , optics , luminance , audiology , mathematics , retina , psychology , medicine , ophthalmology , psychotherapist
Human retinal oscillatory potentials in response to an alternating checkerboard pattern stimulus were studied in two subjects over an intensity range of 7.5 log units. Under scotopic conditions, two wavelets (S 1 and S 2 ) could be recorded. At an intensity of 1.9 photopic log Td four high frequency oscillations (0 1 –0 4 ) were noticed and a discontinuity was observed in the corresponding luminance curve of the b‐wave together with a sudden decrease in the magnitude of the standard deviation of the amplitude measures. The oscillations were noticed only on the ascending slope of the b‐wave. With increasing stimulus intensity, their latency decreased at a slower rate than that of the b‐wave and their number decreased. Each wavelet had an amplitude maximum at a certain stimulus intensity level. It was suggested that 0 1 –0 4 were generated by the activation of the photopic system and that S 1 and S 2 were of scotopic origin.