Abstract

<p>Data were obtained on the difference threshold function for intermittent photic stimuli with the method of single stimuli. Combinations of rate of presentation (<i>F</i>), number of flashes in a train (<i>N</i>), and duration of a train (<i>T</i>) were selected to permit plotting difference thresholds as a function of all possible combinations of <i>F</i>, <i>N</i>, and <i>T</i>.</p><p>The major findings of this study were as follows:</p><p>(1) The number of flashes in a train has a negligible effect upon the difference threshold either in terms of Δ<i>P</i> or Δ<i>F</i>. Values of N ranged from 5 to 40 flashes.</p><p>(2) The duration of a train has a negligible effect upon the difference threshold either in terms of ΔP or ΔF. Values of T ranged from ½ to 4 sec.</p><p>(3) The difference threshold function for intermittent photic stimuli obtained with the method of single stimuli is comparable in form to the function obtained with the method of adjustment.</p><p>(4) Expressing difference thresholds in terms of a period measure points up the similarity between the difference threshold functions obtained with intermittent photic and electric stimuli.</p>

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