The significant features of Japanese macaque coo sounds: a psychophysical study |
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| Institution: | 1. The Kresge Hearing Research, The Institute Ann Arbor, MI 48109, U.S.A.;2. Department of Psychology, The University of Michigan, Ann Arbor, MI 48109, U.S.A.;1. Laboratory Vision Action Cognition – EA 7326, Institute of Psychology, Paris Descartes University – Sorbonne Paris Cité, France;2. University Paris Nanterre – Paris Lumières, CNRS, UMR 7114 Models, Dynamics, Corpora, France;1. Department of Zoology and Evolutionary Biology, Universität Regensburg, Regensburg, Germany;2. Allgemeine und Biologische Psychologie, Philipps-Universität Marburg, Marburg, Germany;1. Translational Neuroscience Division, Center for Biomedical Imaging and Neuromodulation, Nathan Kline Institute for Psychiatric Research, Orangeburg, NY 10962, USA;2. Departments of Neurological Surgery and Psychiatry, Columbia University College of Physicians and Surgeons, New York, NY 10032, USA;3. Donders Institute for Brain, Cognition, and Behaviour, Radboud University, Nijmegen 6500HB, the Netherlands;4. Department of Psychiatry, New York University School of Medicine, New York, NY 10016, USA;1. Institute of Neuroscience, Newcastle University Medical School, Newcastle upon Tyne, UK;2. Centre for Behaviour and Evolution, Newcastle University, Newcastle upon Tyne, UK;3. Wellcome Trust Centre for Neuroimaging, University College London, UK;4. Department of Psychology and Neuroscience, Duke University, Durham, NC, USA;5. Department of Neurosurgery, University of Iowa, Iowa City, USA;6. Department of Physiology, Development and Neuroscience, University of Cambridge, Cambridge, UK |
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| Abstract: | Japanese macaques, Macaca fuscata, were trained with a positive reinforcement operant procedure to discriminate smooth early high and smooth late high coo sounds recorded during Green's (1975) field study of the speices' vocal repertoire. Subjects labelled the various tokens by maintaining contact with a response device for calls from one category and by breaking contact for those of the second call type. After the completion of discrimination training, the generalization of the operant behaviour to novel natural and synthetic vocalizations was measured. Initial generalization tests established that macaques would respond appropriately both to natural vocalizations and to computer-synthesized prototypes representing the smooth early high-smooth late high contrast. In subsequent tests, individual acoustic features were removed from the synthetic prototypes to determine the minimal elements of functional coo sounds. These tests suggested that those sounds are distinguished by the predominant direction of their frequency change which, in turn, is determined by the temporal position of their highest frequency. |
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