The concept of the threshold and Heyman's law of inhibition. III.

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Abstract
Estimates of general and visual "freshness' and record of the number of hours sleep during the night preceding visual threshold determination by a single observer (Cohen) were correlated with visual liminal measurements. Observations were made daily except Sundays for fifty days. "Freshness" ratings and hours of sleep were found to correlate +.55 to +.80 with the values of the visual threshold. "Partial and multiple correlations indicate that the relationship between either 'freshness' or sleep-measures and the visual threshold is negligible except for the factor of susceptibility to inhibition implicated in both." For the last 25 days the values of the r's are distinctly higher than for the first 25 days. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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