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    Catégorie de document Article paru dans une revue
    Titre From ear to hand: the role of the auditory-motor loop in pointing to an auditory source
    Auteur principal Eric O. Boyer
    Co-auteurs Bénédicte M. Babayan, Frédéric Bevilacqua, Markus Noisternig, Agnes Roby-Brami, Sylvain Hanneton, Isabelle Viaud-Delmon
    Paru dans Frontiers In Computational Nuroscience, Avril 2013, Vol. 26, n° 7
    Comité de lecture Oui
    Année 2013
    Statut éditorial Non publié
    Résumé

    Studies of the nature of the neural mechanisms involved in goal-directed movements tend to concentrate on the role of vision. We present here an attempt to address the mechanisms whereby an auditory input is transformed into a motor command. The spatial and temporal organization of hand movements were studied in normal human subjects as they pointed toward unseen auditory targets located in a horizontal plane in front of them. Positions and movements of the hand were measured by a six infrared camera tracking system. In one condition, we assessed the role of auditory information about target position in correcting the trajectory of the hand. To accomplish this, the duration of the target presentation was varied. In another condition, subjects received continuous auditory feedback of their hand movement while pointing to the auditory targets. Online auditory control of the direction of pointing movements was assessed by evaluating how subjects reacted to shifts in heard hand position. Localization errors were exacerbated by short duration of target presentation but not modified by auditory feedback of hand position. Long duration of target presentation gave rise to a higher level of accuracy and was accompanied by early automatic head orienting movements consistently related to target direction. These results highlight the efficiency of auditory feedback processing in online motor control and suggest that the auditory system takes advantages of dynamic changes of the acoustic cues due to changes in head orientation in order to process online motor control. How to design an informative acoustic feedback needs to be carefully studied to demonstrate that auditory feedback of the hand could assist the monitoring of movements directed at objects in auditory space.

    Mots-clés spatial audition / human / pointing movement kinematics / orienting movements / reaching / auditory-motor mapping / movement sonification
    Equipes Interactions musicales temps-réel, Espaces acoustiques et cognitifs
    Cote Boyer13a
    Adresse de la version en ligne http://architexte.ircam.fr/textes/Boyer13a/index.pdf

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