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Effect of Stimulus Duration on Electrical Responses of the Human Retina

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Abstract

The size and form of the b-wave of the human electroretinogram are shown to be dependent on the duration as well as on the intensity (the term stimulus intensity as used in this paper refers to luminance specified in ft-L.) of the stimulating light. In determining the amplitude of submaximal b-waves, intensity and duration share equally until a certain critical duration is reached. Above this critical duration of about 100 msec in the dark-adapted eye, less under conditions of light-adaptation, amplitude is determined by intensity alone. The latency of the response, however, is determined without reference to the stimulus duration. It is interesting to note that a critical duration of just over 100 msec has also been reported from psychophysical studies of the dark-adapted eye in which visual threshold rather than electrical response criteria were used.

© 1956 Optical Society of America

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