Abstract
The modulation detection threshold for a sinusoidally amplitude modulated target tone was measured in the presence of another amplitude modulated interference tone. The interferer had a carrier frequency of 700 Hz and a modulation rate of 40 Hz. The target carrier frequency was 1300 Hz, and its modulation rate was 23, 33, 43, 63, and 80 Hz in separate conditions. During the psychophysical experiment, the auditory frequency following response (FFR) phase-locked to the 700-Hz carrier and the auditory steady-state response (ASSR) phase locked to the 40-Hz modulator were recorded. It was hypothesized that when greater interference occurs (when the interferer and target had closer modulation rates), the neural representation to the interferer might be enhanced or suppressed to a lesser degree. Neither the FFR nor ASSR demonstrated dependency on the target modulation rate, and no significant correlation was found between the behavioral and these two types of physiological measures. Results suggest the possibility that the modulation detection interference might originate from a location that is more central to the neural structures that give rise to FFR and the 40-Hz ASSR.
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