Perception of complex sounds: ’’Hidden auditory figures’’

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Abstract
Hidden auditory figures were generated by ORing the output of a bank of counters, driven by a high-frequency periodic pulse train. The absolute detection, the relative discrimination, and the identification of hidden auditory figures of up to ten prime counts was examined. The crucial factor in detection and discrimination is the context in which the to-be-examined component is embedded. A given count may be nearly perfectly detectable if it is the smallest of the series of prime counts; that same count may be nearly undetectable if it is the largest of the series of prime counts. Within hidden auditory figures, the spread of interference is opposite in direction to most masking situations: High frequencies (represented by small counts) are more effective than low frequencies (represented by large counts). Many of the crucial details are to be found in the spectrum of these signals. Subject Classification: 65.22, 65.56, 65.75.

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