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    Intra-auditory integration between pitch and loudness in humans: Evidence of super-optimal integration at moderate uncertainty in auditory signals

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    Author
    Koh, K.
    Kwon, H.J.
    Kiemel, T.
    Date
    2018
    Journal
    Scientific Reports
    Publisher
    Nature Publishing Group
    Type
    Article
    
    Metadata
    Show full item record
    See at
    https://dx.doi.org/10.1038/s41598-018-31792-w
    Abstract
    When a person plays a musical instrument, sound is produced and the integrated frequency and intensity produced are perceived aurally. The central nervous system (CNS) receives defective afferent signals from auditory systems and delivers imperfect efferent signals to the motor system due to the noise in both systems. However, it is still little known about auditory-motor interactions for successful performance. Here, we investigated auditory-motor interactions as multi-sensory input and multi-motor output system. Subjects performed a constant force production task using four fingers in three different auditory feedback conditions, where either the frequency (F), intensity (I), or both frequency and intensity (FI) of an auditory tone changed with sum of finger forces. Four levels of uncertainty (high, moderate-high, moderate-low, and low) were conditioned by manipulating the feedback gain of the produced force. We observed performance enhancement under the FI condition compared to either F or I alone at moderate-high uncertainty. Interestingly, the performance enhancement was greater than the prediction of the Bayesian model, suggesting super-optimality. We also observed deteriorated synergistic multi-finger interactions as the level of uncertainty increased, suggesting that the CNS responded to increased uncertainty by changing control strategy of multi-finger actions. Copyright 2018, The Author(s).
    Keyword
    auditory-motor interactions
    Central Nervous System
    Loudness Perception
    Pitch Perception
    Identifier to cite or link to this item
    https://www.scopus.com/inward/record.uri?eid=2-s2.0-85053270064&doi=10.1038%2fs41598-018-31792-w&partnerID=40&md5=45a4becc6b8b641372217149cd5550a0; http://hdl.handle.net/10713/9399
    ae974a485f413a2113503eed53cd6c53
    10.1038/s41598-018-31792-w
    Scopus Count
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