Subjective flicker rate with relation to critical flicker frequency.

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Abstract
By use of 2 virtually adjacent equal-sized test objects which flickered at different rates (fixed ratios), the brightness of one field being adjustable, it was demonstrated that subjective flicker and objective flash rate do not always correspond. The subjective flicker rate near the critical flicker frequency (C. F. F.) is about the same over a wide if not the total range of intensities. The subjective flicker rate is altered when intensity is varied from dim to bright flashes. This discrepancy between subjective and objective flicker rate is another bit of evidence in favor of the neural rather than the photochemical basis of critical flicker frequency.

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