Short-Term Visual Restriction in Visual and Auditory Discrimination

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Abstract
This study explored the effect of sensory restriction on perceptual thresholds. The experimental predictions were formulated from Lindsley's model of the reticular activating system (RAS). Attention was focused upon changes in the visual CFF threshold, loudness discrimination and pitch discrimination as related to two levels of visual restriction. Ss were 60 male volunteers. Statistical analysis included analysis of covariance followed by a priori group comparisons. Statistical support ( p < .05) was found for 3 of 4 general hypotheses. It was concluded that the RAS attempts to maintain cortical arousal at an optional level by regulating stimulus input. A reduction in this input apparently lowers perceptual thresholds in the sensory system restricted and other systems as well.

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