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• W2918532536 abstract "The aim of this thesis at hand was to investigate the acoustic communication system of the gray mouse lemur focussing on two parts, the receiver and the sender. Since communication is almost always impaired by noise, effects of background noise on gray mouse lemur acoustic communication were analysed in particular. Auditory thresholds and hearing sensitivity are key features characterizing the receiver, thus the first study presents data on the hearing abilities of gray mouse lemurs. Brainstem evoked response audiometry was applied to measure the auditory brainstem response and to establish comparable auditory thresholds of the species. Additionally, the influence of aging on auditory thresholds and hearing sensitivity was analysed, revealing a broadband age-related decrease. The results were discussed concerning the possible type of age-related hearing loss indicating a metabolic or conductive age-related decrease or even a degeneration of the cochlear nerve. In the light of different models of the evolution of hearing sensitivity in primates and mammals, findings support the social drive model which considers social complexity as a driving factor of the evolution of hearing sensitivity. Focussing on the sender of the acoustic communication system, the second study deals with the question how fluctuating background noise influences the vocal behaviour and structure of gray mouse lemurs. Several noise-dependent vocal adaptations were presented revealing that subjects decreased calling activity in increased noise. Additionally, gray mouse lemurs adapted vocal structure showing an increase of call amplitude in noise and increased signal redundancy in the frequency domain. The findings suggest that elements of complex noise-dependent changes in human speech originated from a pre-human basis. Furthermore, the results were discussed concerning potential peripheral and neuronal mechanisms underlying the control of these vocal changes. Finally, possible neuronal substrates were discussed underlying the audio-vocal coupling that leads to the noise-dependent vocal changes. Taking all results together, I conclude that the gray mouse lemur is a valuable non-human primate model species that can help to provide further insight on basic mechanisms and principles of acoustic communication systems and their potential underlying evolution." @default.
• W2918532536 created "2019-03-11" @default.
• W2918532536 creator A5079260023 @default.
• W2918532536 date "2013-01-01" @default.
• W2918532536 modified "2023-09-27" @default.
• W2918532536 title "Acoustic communication in noise: the gray mouse lemur as a primate model" @default.
• W2918532536 hasPublicationYear "2013" @default.
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