ELLERMEIER, W and EMMERICH, DS (1993) REACTION-TIMES TO UNIDIRECTIONAL FREQUENCY CHANGES - A TEST OF ZWICKER EXCITATION-PATTERN MODEL. JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, 94 (6). pp. 3144-3152. ISSN 0001-4966,
Full text not available from this repository.Abstract
A reaction-time methodology was used to evaluate excitation-pattern models of frequency discrimination. These models assume that in order to detect frequency changes, the auditory system actually monitors intensity changes in the filter array along which the excitation pattern is shifted. According to Zwicker's model, it is along the steep low-frequency slope of the excitation pattern that small frequency changes will be detected. Consequently, small downward shifts in frequency should produce an increment in excitation in the filter monitored, while upward shifts should be associated with a decrement in activity in that filter. Since simple auditory reaction time (RT) is differentially sensitive to increments and decrements in intensity, it seems particularly suitable to studying this conceptualization. In experiment 1, it was demonstrated that increments in intensity elicit faster responses than decrements of equal magnitude. Experiment 2 found that when subjects had to respond to small changes in frequency on the order of 4-20 Hz, reaction time to upward shifts in frequency was faster than reaction time to downward shifts by about 20 ms. This asymmetry, however, rapidly reduced to zero when the magnitude of the frequency shift was made larger, as demonstrated in experiment 3. While these results are inconsistent with the idea that increments and decrements in excitation level in a single channel tuned to the low-frequency slope of the excitation pattern determine frequency-discrimination performance, they can be accounted for when it is assumed that listeners monitor more than one channel to detect a frequency change. Further support for this notion was found in experiment 4 in which parts of the excitation pattern were selectively
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | LOW MODULATION FREQUENCIES; AMPLITUDE-MODULATION; TONE-GLIDES; SWEEP TONES; DISCRIMINATION; IDENTIFICATION; DURATION; CHANNELS; MASKING; BURSTS; |
| Depositing User: | Dr. Gernot Deinzer |
| Last Modified: | 19 Oct 2022 08:42 |
| URI: | https://pred.uni-regensburg.de/id/eprint/53655 |
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