[en] OBJECTIVES: This study investigated the efficiency of a multiplexed amplitude-modulated (AM) stimulus in eliciting auditory steady-state responses. The multiplexed AM stimulus was created by simultaneously modulating speech-shaped noise with three frequencies chosen to elicit different neural generators: 3.1, 40.1, and 102.1 Hz. For comparison, a single AM stimulus was created for each of these frequencies, resulting in three single AM conditions and one multiplex AM condition.
DESIGN: Twenty-two bilaterally normal-hearing participants (18 females) listened for 8 minutes to each type of stimuli. The analysis compared the signal to noise ratios (SNRs) and amplitudes of the evoked responses to the single and multiplexed conditions.
RESULTS: The results revealed that the SNRs elicited by single AM conditions were, on average, 1.61 dB higher than those evoked by the multiplexed AM condition ( p < 0.05). The single conditions consistently produced a significantly higher SNR when examining various stimulus durations ranging from 1 to 8 minutes. Despite these SNR differences, the frequency spectrum was very similar across and within subjects. In addition, the sensor space patterns across the scalp demonstrated similar trends between the single and multiplexed stimuli for both SNR and amplitudes. Both the single and multiplexed conditions evoked significant auditory steady-state responses within subjects. On average, the multiplexed AM stimulus took 31 minutes for the lower bound of the 95% prediction interval to cross the significance threshold across all three frequencies. In contrast, the single AM stimuli took 45 minutes and 42 seconds.
CONCLUSIONS: These findings show that the multiplexed AM stimulus is a promising method to reduce the recording time when simultaneously obtaining information from various neural generators.
Disciplines :
Neurosciences & behavior
Author, co-author :
Sonck, Rien ; Université de Liège - ULiège > GIGA > GIGA Neurosciences - Coma Science Group ; Department of Neurosciences, Research Group Experimental Oto-rhino-laryngology, KU Leuven, Leuven, Belgium ; These authors shared first-authorship
Vanthornhout, Jonas; Department of Neurosciences, Research Group Experimental Oto-rhino-laryngology, KU Leuven, Leuven, Belgium ; These authors shared first-authorship
Bonin, Estelle ; Université de Liège - ULiège > GIGA > GIGA Neurosciences - Coma Science Group
Francart, Tom; Department of Neurosciences, Research Group Experimental Oto-rhino-laryngology, KU Leuven, Leuven, Belgium
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