Modeling the precedence effect: Mechanisms of onset enhancement in binaural lateralization models
Roberto M. Dizon, H. Steven Colburn · The Journal of the Acoustical Society of America · 1999
The general behaviors of several cross-correlation-based lateralization models in response to dynamic impulsive stimuli, specifically those that elicit the precedence effect, are presented as a means of gaining insight into the contribution of individual stages of the models to precedencelike performance. In general, an enhancement of activity at onset relative to later activity in the model outputs (or equivalently, a temporary post-onset suppression in activity) is associated with the relative perceptual emphasis of early portions of stimuli as described by the precedence effect. Onset enhancement in cross-correlation models has thus far only been exhibited using dynamic mechanisms such as that used in a model by Lindemann [J. Acoust. Soc. Am. (1986)]. This work evaluates the dynamic properties of several cross-correlation models that include mechanisms of onset enhancement. These mechanisms include that of Lindemann’s model, peripheral mechanisms such as adaptation, and a physiologically based inhibition mechanism adapted from the IC model of Cai, Carney, and Colburn [J. Acoust. Soc. Am. (1998)]. In this work, binaural models are created from various permutations of the mechanisms described above, and the final and intermediate model outputs in response to a few sample stimuli are shown and compared. [Work supported by ONR and NIH (NIDCD R01 DC00100).]