The Journal of the Acoustical Society of America, Vol. 121, No. 1, pp. EL23–EL28, January 2007
©2007 Acoustical Society of America. All rights reserved. 
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Why do transposed stimuli enhance binaural processing?: Interaural envelope correlation vs envelope normalized fourth moment
Leslie R. Bernstein and Constantine Trahiotis
Department of Neuroscience and Department of Surgery (Otolaryngology), University of Connecticut Health Center, Farmington, Connecticut 06030
(Received: 18 September 2006; revised: 13 October 2006; accepted: 13 October 2006; published online: 8 December 2006)High-frequency, “transposed” stimuli have been shown to yield enhanced processing of ongoing interaural temporal disparities (ITDs). This paper concerns determining which aspect or aspects of the envelopes of such stimuli mediate enhanced resolution of ITD. Behavioral measures and quantitative analyses utilizing special classes of transposed stimuli show that the “internal” interaural envelope correlation accounts both qualitatively and quantitatively for the enhancement. In contrast, the normalized fourth moment of the envelope (Y), which provides an index of the degree to which the envelopes of high-frequency stimuli fluctuate, does not lead to a successful accounting of the data. ©2007 Acoustical Society of America
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