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A decision weight analysis of transition bandwidths
1Department of Cognitive Sciences, University of California, Irvine, 2201 SBSG, Irvine, California 92697-5100, USA. bgberg@uci.edu
Abstract:
A decision weight analysis is used to investigate transition bandwidths [Berg (2007). J. Acoust. Soc. Am. 121, 3639-2645]. The psychophysical task is similar to a standard profile analysis experiment except that the spacing of the tones comprising the stimuli is linear and very narrow (e.g., 20 Hz). An increment in the level of the central tone constitutes the signal. Pitch cues and single channel energy cues are degraded with randomization procedures. Thresholds increase as the number of tones comprising the stimulus (n) increases up to a transition bandwidth and then decrease or stay constant with further increases in n. It is proposed that the transition bandwidth reflects a discrete change in the underlying process, with a temporal process (e.g., envelope processor) dominating for stimulus bandwidths less than the transition bandwidth and a process of spectral profile analysis at wider bandwidths. Estimates of decision weights support the proposal.
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