title: Characterizing the dynamics of auditory perception.
abstract: After listening to a sound that is presented repeatedly, subjects report hearing different transforms of the original sound. The frequency of reported transforms is a sensitive index of some speech disorders as well as cognitive flexibility in aging. In this paper, we propose and investigate quantitative measures that characterize the dynamics of this phenomenon, known as the verbal transformation effect. In particular, we show that the distribution of the dwell time, the time spent perceiving a string of a given phonemic form before switching to another form, obeys a power law for normal subjects with an exponent valued between 1 and 2. This result suggests that within this paradigm there is no characteristic time scale for the perceptual process. Additionally, we analyze the correlation properties of the transforms. We suggest that the complexity measures and techniques introduced here might be useful diagnostic tools for a number of speech and cognitive disorders. (c) 1995 American Institute of Physics.
authors.affiliation: Program in Complex Systems and Brain Sciences, Center for Complex Systems and Department of Mathematics, Florida Atlantic University, Boca Raton, Florida 33431Program in Complex Systems and Brain Sciences, Center for Complex Systems, Florida Atlantic University, Boca Raton, Florida 33431.
authors.forename: Mingzhou
authors.initials: M
authors.lastname: Ding
authors.forename: Betty
authors.initials: B
authors.lastname: Tuller
authors.forename: J. A. Scott
authors.initials: JA
authors.lastname: Kelso