Classification of Amplitude-Modulated Noise Patterns with Extended Practice.
CATHOLIC UNIV OF AMERICA WASHINGTON D C HUMAN PERFORMANCE LAB
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Four listeners were given extended practice in an eight-category classification task 3072 trials. The stimuli were sixteen amplitude-modulated noise patterns that varied in modulation frequency Tempo and attack Quality. Two listeners learned an eight-category partition that was based primarily on stimulus Quality, and two learned a partition that was based primarily on stimulus Tempo. The resulting confusion data were analyzed in terms of the aural classification model proposed by Howard, Ballas, and Burgy 1978. The theoretical analysis enabled us to specify the relative emphasis placed on the two stimulus features by each listener on each of the sixteen trial blocks. The results indicated that although large individual differences occurred, all listeners had more difficulty making use of the subtle stimulus differences along the Quality dimension than they did of differences along the Tempo dimension.
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