Referential Aspects in the Vocal Repertoire of Bonobos (<I>Pan
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Iowa State University Capstones, Theses and Graduate Theses and Dissertations Dissertations 2009 Referential aspects in the vocal repertoire of bonobos (Pan paniscus) Kathleen Marie Klag Iowa State University Follow this and additional works at: https://lib.dr.iastate.edu/etd Part of the Anthropology Commons Recommended Citation Klag, Kathleen Marie, "Referential aspects in the vocal repertoire of bonobos (Pan paniscus)" (2009). Graduate Theses and Dissertations. 10549. https://lib.dr.iastate.edu/etd/10549 This Thesis is brought to you for free and open access by the Iowa State University Capstones, Theses and Dissertations at Iowa State University Digital Repository. It has been accepted for inclusion in Graduate Theses and Dissertations by an authorized administrator of Iowa State University Digital Repository. For more information, please contact [email protected]. Referential aspects in the vocal repertoire of bonobos ( Pan paniscus ) by Kathleen Marie Klag A thesis submitted to the graduate faculty in partial fulfillment of the requirements for the degree of MASTER OF ARTS Major: Anthropology Program of Study Committee: Jill Pruetz, Major Professor Sue Savage-Rumbaugh Mack Shelley Rob Shumaker Serge Wich Iowa State University Ames, Iowa 2009 Copyright © Kathleen Marie Klag, 2009. All rights reserved. ii Table of Contents List of Figures ................................................................................................................ iv List of Tables....................................................................................................................v Acknowledgements ...................................................................................................... viii Abstract ........................................................................................................................... x Chapter One: Introduction 1.1 Background & Significance...............................................................................1 1.2 Objectives & Hypotheses...................................................................................3 1.3 Human Language & Animal Vocal Communication Systems ..........................4 1.4 Evolutionary Process .......................................................................................10 1.4.1 Gestural Origin of Language............................................................................... 10 1.4.2 Speech Origin of Language................................................................................. 13 1.4.3 When Did Language Evolve? ............................................................................. 15 References..............................................................................................................17 Chapter Two: Functional Referential & Referential Communication 2.1 Development of the Functional Referent Concept...........................................25 2.2 Functional Referents in Birds ..........................................................................27 2.3 Functional Referent in Non-Primate Mammals...............................................28 2.4 Functional Referents in Nonhuman Primates ..................................................30 2.4.1 Prosimians........................................................................................................... 30 2.4.2 New World Monkeys.......................................................................................... 30 2.4.3 Old World Monkeys ........................................................................................... 31 2.4.4 Great Apes .......................................................................................................... 34 2.5 Critiques of Functional Referents ....................................................................37 2.6 Development of Referential Communication Studies with Great Apes ..........39 2.7 Referential Communication with Kanzi ..........................................................42 References..............................................................................................................45 Chapter Three: Methods 3.1 Hypotheses.......................................................................................................54 3.2 Study Site.........................................................................................................54 3.3 Study Subject and Materials ............................................................................55 3.4 Data Collection ................................................................................................56 3.5 Raven Program ................................................................................................56 3.6 Data Analysis...................................................................................................58 References..............................................................................................................62 Chapter Four: Results 4.1 Data Collected..................................................................................................64 iii 4.2 Full Data Set Models .......................................................................................68 4.2.1 Model 1............................................................................................................... 68 4.2.2 Model 2............................................................................................................... 72 4.2.3 Model 3............................................................................................................... 77 4.2.4 Model 4............................................................................................................... 79 4.2.5 Model 5............................................................................................................... 81 4.2.6 Model 6............................................................................................................... 85 4.3 Limited Data Set Models .................................................................................89 4.3.1 Model 1............................................................................................................... 89 4.3.2 Model 2............................................................................................................... 91 4.3.3 Model 3............................................................................................................... 93 4.3.4 Model 4............................................................................................................... 94 4.3.5 Model 5............................................................................................................... 97 4.3.6 Model 6............................................................................................................. 100 4.4 Model Summary.............................................................................................103 Chapter Five: Discussion 5.1 Introduction....................................................................................................106 5.2 Statistical Significance – When is it Referential?..........................................107 5.3 Initial Assumptions & Impact on Referential Studies ...................................111 5.4 Methodology of Referential Studies ..............................................................120 5.5 Terminology...................................................................................................130 5.6 Evolutionary Implications..............................................................................132 5.7 Conclusion .....................................................................................................134 5.7.1 Findings of this Study ....................................................................................... 134 5.7.2 Future Directions of Study................................................................................ 137 5.7.3 Theoretical Implications ................................................................................... 139 References............................................................................................................140 iv List of Figures Figure 3.1 Spectrogram of a recording session magnified to show the measurement used 58 for one particular vocalization Figure 4.1 Graph of factors based on eigenvalues for the various factors created for full 72 data Model 1 Figure 4.2 Plot of variable pattern for Factor 1 versus Factor 2 in full data Model 1 72 Figure 4.3 Graph of factors based on eigenvalues for full data Model 2 75 Figure 4.4 Plot of factor pattern for Factor 1 versus Factor with full data Model 2 76 Figure 4.5 Plot of factor pattern for Factor 2 versus Factor 3 with full data Model 2 76 Figure 4.6 Graph of factors based on eigenvalues for full data Model 5 84 Figure 4.7 Plot of factor pattern for Factor 1 versus Factor 2 with full data Model 5 85 Figure 4.8 Plot of factor pattern for Factor 2 versus Factor 3 with full data Model 5 85 Figure 4.9 Graph of factors based on eigenvalues created for full data Model 6 87 Figure 4.10 Plot of factor pattern for Factor 1 versus Factor 2 with full data Model 6 89 Figure 4.11 Graph of factors based on eigenvalues created for limited Model 4 96 Figure 4.12 Graph of factors based on eigenvalues created for limited data Model 5 99 Figure 4.13 Plot of factor pattern for Factor 1 versus Factor 2 for limited data Model 5 100 Figure 4.14 Graph of factors