Abstract
Duplex perception (DP) occurs when one stimulus or stimulus component contributes simultaneously to two distinct percepts. Most DP research has been used to loosely address the postulation of a phonetic module. The present musical DP experiments focus instead on the utility of DP in evaluating perceptual organization. The present investigation evaluated one variable which, according to Gestalt notions, could be critical to DP, base complexity (the number of frequency components in the base). In a modified AX task, two experiments used chord stimuli, dichotically presenting a fixed base and variable (major/minor chord) distinguishing tone on each trial. Fusion of contralateral distinguishing tones was frequent, but contrary to modularity conjectures, little evidence was found for triplex perception. Other unexpected results will be presented. Findings are discussed as they apply to (a) speech stimuli (stimulus dominance) and (b) attentional constructs (as an example of feature integration). [Work supported by NSF.]
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