Discrimination and Recognition of Weak Stimuli

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Abstract
Introduction The idea of mental function without conscious recognition or awareness has and continues to stimulate a great deal of thought and experimentation in many diverse quarters. Unfortunately, the phenomena in question are by their very nature elusive and have so far defied attempts to apprehend them firmly enough for really rigorous experimental manipulation. Because of this and because of the variety of disciplines interested, a literature which would in any event be complex and scattered has, under the added burden of doctrinaire convictions and semantic difficulties, become extremely heavy and confusing. In recent years, considerable interest has developed around several questions regarding responses to sensory stimuli which are too weak to evoke full or direct conscious recognition in the subject even with deliberate effort and concentration. There is considerable evidence to support the contention that sensory inputs too feeble to

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