Abstract
The present study utilized a commercially available multiple auditory steady-state response (ASSR) system to test normal hearing adults (n=55). The primary objective was to evaluate the impact of the mixed modulation (MM) and the novel proposed exponential AM2/FM stimuli on the signal-to-noise ratio (SNR) and threshold estimation accuracy, through a within-subject comparison. The second aim was to establish a normative database for both stimulus types. The results demonstrated that the AM2/FM and MM stimulus had a similar effect on the SNR, whereas the ASSR threshold results revealed that the AM2/FM produced better thresholds than the MM stimulus for the 500, 1000, and 4000 Hz carrier frequency. The mean difference scores to tones of 500, 1000, 2000, and 4000 Hz were for the MM stimulus: 20±12, 14±9, 10±8, and 12±8 dB; and for the AM2/FM stimulus: 18±13, 12±8, 11±8, and 10±8 dB, respectively. The current research confirms that the AM2/FM stimulus can be used efficiently to test normal hearing adults.
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