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The role of vocal-tract characteristics and pitch patterns in identifying individuality in Coo calls of Japanese macaques

2012; Frontiers Media; Volume: 6; Linguagem: Inglês

10.3389/conf.fnbeh.2012.27.00246

1662-5153

Riquimaroux Hiroshi,

Hearing Loss and Rehabilitation

Event Abstract Back to Event The role of vocal-tract characteristics and pitch patterns in identifying individuality in Coo calls of Japanese macaques Takafumi Furuyama1, Kohta I. Kobayasi2 and Hiroshi Riquimaroux1, 2* 1 Doshisha University, Department of Biomedical Engineering and Biomedical Information, Graduate school of Life and Medical Sciences, Japan 2 Doshisha University, Department of Biomedical Information, Japan Japanese macaques have a species-specific communication sound called “Coo call”. The animals could identify individuality only by listening to the voices. Japanese macaques utter the Smooth Early High (SEH), one type of Coo calls, for greeting and locating other individuals. The purpose of this study was to investigate the acoustical key for the monkey to identify the caller of SEH. Two male animals were trained to discriminate between SEHs of macaque A (SEHa) and those of B (SEHb) (those calls were generated by unfamiliar monkeys for subjects). Six SEHs from each individual were used as training stimuli. The subject had to press a lever to begin a trial. Either SEHa (NOGO stimulus) or SEHb (GO stimulus) was presented after repetitive presentation of SEHa 3-5 times. If SEHb was presented (GO) as discriminative stimulus, the monkey had to release the lever. If SEHa continued (NOGO), the animal had to keep holding the lever. Inter onset interval between adjacent SEHs was 1s. If the subject failed to release the lever within 1s after offset of GO stimulus, a “miss” was scored. If the animal correctly released within 1s, a “hit” was scored. If the lever was not released within 1s after offset of NOGO stimulus, a “correct rejection” was scored. If the monkey released the lever during SEHa trials, a “false alarm” was scored. When the animal responded correctly to trials, the subject was given about 1ml juice about as a reward. An arbitrary threshold of 90% correct responses (the total percentage of hit and correct rejection) was chosen. After verifying that the percentage of correct response was higher than the threshold value for 2 consecutive days, the subjects were proceeded to test trials. Test stimuli were SEH of macaque A (SEHa) and those of B (SEHb) (which were not used for training sessions) and chimera sounds synthesized by combining the fundamental frequency and vocal-tract characteristics from the other individuals (Chimera X was synthesized from the fundamental frequency of macaque A’s SEH and the vocal-tract characteristics of macaque B’s SEH, Chimera Y was created from the fundamental frequency of macaque B’s SEH and the vocal-tract characteristics of macaque A’s SEH) by using Speech Transformation and Representation based on Adaptive Interpolation of weiGHTed spectrogram (STRAIGHT). Those test stimuli were presented after SEHs of macaque A repeated 4 times. As results, the reaction times of untrained SEH of macaque A were significantly longer than the reaction times of unfamiliar SEH of macaque B even though GO response rates to test stimuli were higher than 75% in each monkey. However, each reaction time of both chimera sounds was not significantly different. Those results suggested that the generalization was occurred within SEH of same individual, and that neither the fundamental frequency nor the vocal-tract characteristics alone was dominant acoustic characteristics to identify individuality. Keywords: Communication, GO/NOGO operant conditioning, Reaction Time, STRAIGHT Conference: Tenth International Congress of Neuroethology, College Park. Maryland USA, United States, 5 Aug - 10 Aug, 2012. Presentation Type: Poster (but consider for student poster award) Topic: Sensory: Audition Citation: Furuyama T, Kobayasi KI and Riquimaroux H (2012). The role of vocal-tract characteristics and pitch patterns in identifying individuality in Coo calls of Japanese macaques. Conference Abstract: Tenth International Congress of Neuroethology. doi: 10.3389/conf.fnbeh.2012.27.00246 Copyright: The abstracts in this collection have not been subject to any Frontiers peer review or checks, and are not endorsed by Frontiers. They are made available through the Frontiers publishing platform as a service to conference organizers and presenters. The copyright in the individual abstracts is owned by the author of each abstract or his/her employer unless otherwise stated. Each abstract, as well as the collection of abstracts, are published under a Creative Commons CC-BY 4.0 (attribution) licence (https://creativecommons.org/licenses/by/4.0/) and may thus be reproduced, translated, adapted and be the subject of derivative works provided the authors and Frontiers are attributed. For Frontiers’ terms and conditions please see https://www.frontiersin.org/legal/terms-and-conditions. Received: 30 Apr 2012; Published Online: 07 Jul 2012. * Correspondence: Prof. Hiroshi Riquimaroux, Doshisha University, Department of Biomedical Information, Kyotanabe, Kyoto, 610-0321, Japan, hrikimar@mail.doshisha.ac.jp Login Required This action requires you to be registered with Frontiers and logged in. To register or login click here. Abstract Info Abstract The Authors in Frontiers Takafumi Furuyama Kohta I Kobayasi Hiroshi Riquimaroux Google Takafumi Furuyama Kohta I Kobayasi Hiroshi Riquimaroux Google Scholar Takafumi Furuyama Kohta I Kobayasi Hiroshi Riquimaroux PubMed Takafumi Furuyama Kohta I Kobayasi Hiroshi Riquimaroux Related Article in Frontiers Google Scholar PubMed Abstract Close Back to top Javascript is disabled. Please enable Javascript in your browser settings in order to see all the content on this page.