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Detection of Modulated Tones in Modulated Noise by Non-human Primates

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Abstract

In natural environments, many sounds are amplitude-modulated. Amplitude modulation is thought to be a signal that aids auditory object formation. A previous study of the detection of signals in noise found that when tones or noise were amplitude-modulated, the noise was a less effective masker, and detection thresholds for tones in noise were lowered. These results suggest that the detection of modulated signals in modulated noise would be enhanced. This paper describes the results of experiments investigating how detection is modified when both signal and noise were amplitude-modulated. Two monkeys (Macaca mulatta) were trained to detect amplitude-modulated tones in continuous, amplitude-modulated broadband noise. When the phase difference of otherwise similarly amplitude-modulated tones and noise were varied, detection thresholds were highest when the modulations were in phase and lowest when the modulations were anti-phase. When the depth of the modulation of tones or noise was varied, detection thresholds decreased if the modulations were anti-phase. When the modulations were in phase, increasing the depth of tone modulation caused an increase in tone detection thresholds, but increasing depth of noise modulations did not affect tone detection thresholds. Changing the modulation frequency of tone or noise caused changes in threshold that saturated at modulation frequencies higher than 20 Hz; thresholds decreased when the tone and noise modulations were in phase and decreased when they were anti-phase. The relationship between reaction times and tone level were not modified by manipulations to the nature of temporal variations in the signal or noise. The changes in behavioral threshold were consistent with a model where the brain subtracted noise from signal. These results suggest that the parameters of the modulation of signals and maskers heavily influence detection in very predictable ways. These results are consistent with some results in humans and avians and form the baseline for neurophysiological studies of mechanisms of detection in noise.

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Acknowledgments

This research was funded by a grant from the National Institutes of Health, R01 DC 11092. The authors would like to thank Mary Feurtado for the help during surgery, Bruce and Roger Williams for the hardware. Meagan Quinlan and Dr. Jason Grigsby collected some preliminary data and performed some preliminary data analysis.

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Authors and Affiliations

  1. Department of Hearing and Speech Sciences, Vanderbilt University School of Medicine, Nashville, TN, 37232, USA

    Peter Bohlen, Margit Dylla, Courtney Timms & Ramnarayan Ramachandran

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  1. Peter Bohlen
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  2. Margit Dylla
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  3. Courtney Timms
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  4. Ramnarayan Ramachandran
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Correspondence to Ramnarayan Ramachandran.

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Bohlen, P., Dylla, M., Timms, C. et al. Detection of Modulated Tones in Modulated Noise by Non-human Primates. JARO 15, 801–821 (2014). https://doi.org/10.1007/s10162-014-0467-7

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