Physiological coherence during live music performance

187 Pages·2016·4.43 MB·English

by  Gehart Kalmeier

Physiological coherence during live music

performance -

A real-time, exploratory investigation
using wireless systems.

DISSERTATION

Submitted in fulfilment of the requirements for the degree of

Magister Scientiae in Human Physiology

2016

by

Gehart Kalmeier

B. Sc. Hons (Pret.)

28039662

Department of Physiol ogy

Faculty of Health Sciences

University of Pretoria

0002
South Africa

Website: http://www.up.ac.za

© University of Pretoria
Project submitted in fulfilment of the requirements for the degree:

M.Sc. Human Physiology

through the Department of Physiology, at the Faculty of Health Sciences,

University of Pretoria.

Candidate

Name: Gehart Kalmeier
Student number: 28039662
Department: Human Physiology

Faculty of Health Sciences

University of Pretoria

Email:
ACKNOWLEDGEMENTS

I wish to thank and acknowledge the roles of the following people

and institutions in the completion of this research:

Prof Peet du Toit who offered to meet with me under no obligation several years back and

has since given me the opportunities to grow and express myself, both as a researcher and as

a professional.

The National Research Foundation (NRF), and the Department of Physiology (UP) for

their financial and continued support.

The volunteers, who not only made this study possible, but gave me the opportunity to be
an observer – both as an academic and as a musician.
Dr Clorinda Panebianco-Warrens for her candour and the infectious optimism that
nurtured this project into being.

To Dr Ariana van Heerden for her help in planting the seeds and sharing her ambitions;
To Michael Kleynhans (UP), Lynton Hazelhurst (TUT), & Prof Peter Bartel (Steve Biko
Academic Hospital) for their help in laying the top soil.
To Leon Brits for not only helping me understand the physics behind signal processing, but
for raising more questions in my head, for being a friend and for sharing a curiosity for things.

To Dr Nicoleen Coetzee for her preparedness to assist me with the statistics for this study

th
at the 11 hour, but also for her genuine kindness.

To Jessica Farinha for assisting me with testing and for supporting my endeavours.

To Christa van Zyl and Elma Jacobs for their unrelenting faith and support, but also for

giving me a foothold to not only fend for myself, but to teach.

To my body and my own neural substrate for its affinity towards aspirin, caffeine and
nicotine, but moreover, for being a constant reminder of my mortality and the ephemerality
of youth.

I
© University of Pretoria
Dedicated with special thanks

To my mother, for teaching me humility and compassion, and for connecting me to myself
and the Light I wish to harbour.
To my father, for teaching me resourcefulness and autonomy, and for connecting me to
people and a world beyond conventionality.
To my brother, for believing in me always and for teaching me how to grab the bull by its
horns \m/

To Richard Beardsley, Sarah Whigham, Joseph Mulders and Tammy Bean for not only being

in the same boat, but for rocking it more whenever things got tough and for being a living

example that not all who wonder are lost.

To my friends – in particular Anneke, Ashton, Ciska, Deon, Jonathan, Leon, Rikus, Ross,
Sven, Daniel, Wimpie and Drikus – without whom I would have a normal life and no
purpose.

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TABLE OF CONTENT

ACKNOWLEDGEMENTS ........................................................................................................................ I

ETHICS CLEARNACE CERTIFICATE..................................................................................................III

TABLE OF CONTENT ........................................................................................................................ IVV

LIST OF FIGURES .............................................................................................................................VIIII
LIST OF TABLES ...................................................................................................................................X
LIST OF ABBREVIATIONS..................................................................................................................XII
ABSTRACT..........................................................................................................................................XIII
ABSTRAK ............................................................................................................................................ XV
CHAPTER 1

1.1 INTRODUCTION AND RATIONALE .......................................................................................... 2

1.2 AIM .................................................................................................................................................... 5

1.2.1 OBJECTIVES ................................................................................................................................. 5

1.3 MOTIVATION FOR RESEARCH ...................................................................................................... 5

1.4 OVERVIEW OF CHAPTERS ............................................................................................................ 7

1.5 REFERENCES .................................................................................................................................. 9

CHAPTER 2

2.1 HEART RATE VARIABILITY: FROM ATRIUM TO ANALYSIS ...................................................... 2

2.1.1 DEFINING HEART RATE VARIABILITY ................................................................................................ 2

2.1.2 THE PHYSIOLOGY OF HR MODULATION AND VARIABILITY ................................................................. 2
2.1.2.1 Autonomic control of th e heart ............................................................................................ 3
2.1.2.2 Parasympathetic nervous system (PNS) ............................................................................ 4
2.1.2.3 Sympathetic nervous system (SNS) ................................................................................... 5

2.1.2.4 Higher modulation of heart rate .......................................................................................... 5

2.1.3 FACTORS AFFECTING HRV ............................................................................................................ 6
2.1.3.1 Baroreceptor reflex .............................................................................................................. 7
2.1.3.2 Endocrine influences ........................................................................................................... 7

2.1.3.3 Thermoregulation ................................................................................................................ 7

2.1.3.4 Respiratory sinus arrhythmia .............................................................................................. 8
2.1.4 ANALYSIS OF HRV ........................................................................................................................ 9
2.1.4.1 Time domain analyses ...................................................................................................... 10

2.1.4.2 Frequency domain analyses ............................................................................................. 10

2.1.4.3 Filtering of HRV data ......................................................................................................... 13

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2.2 ELECTROENCEPHALOGRAPHY: FROM CORTEX TO CONDITIONING .................................. 13
2.2.1. DEFINING ELECTROENCEPHALOGRAPHY ...................................................................................... 13
2.2.2 SIGNAL GENERATION AND ELECTROPHYSIOLOGY OF THE BRAIN ..................................................... 14

2.2.2.1 The neuronal makeup and membrane .............................................................................. 14

2.2.2.2 Fast depolarization of neuronal membranes..................................................................... 16

2.2.2.3 Slower membrane potential changes ................................................................................ 18
2.2.3 EEG SIGNAL CAPTURE ................................................................................................................ 20

2.2.3.1 Data montage and recording ............................................................................................ 22

2.2.4 EEG SIGNAL CONDITIONING AND MECHANICS ............................................................................... 25

2.2.4.1 Frequency and amplitude.................................................................................................. 27
2.2.4.2 Morphology ....................................................................................................................... 31
2.2.4.3 Symmetry .......................................................................................................................... 32

2.3 LINKING THE BRAIN AND THE HEART ...................................................................................... 32

2.3.1 PHYSIOLOGICAL COHERENCE ...................................................................................................... 32

2.3.2 ATTENTIONAL CONTROL .............................................................................................................. 35

2.4 CREATIVITY, FLOW AND IMPROVISATION ............................................................................... 36

2.4.1 CONTEXT AND OVERVIEW ............................................................................................................ 36

2.4.1.1 Defining creativity in performance ..................................................................................... 38

2.4.2 THE CREATIVE BRAIN .................................................................................................................. 40
2.4.2.1 Creative versus goal-directed thought .............................................................................. 44
2.4.2.2 Implicit versus explicit information processing .................................................................. 46

2.4.3 FLOW ......................................................................................................................................... 48

2.4.4 IMPROVISATION .......................................................................................................................... 49

2.5 SUMMARY ...................................................................................................................................... 52

2.6 REFERENCES ................................................................................................................................ 54

CHAPTER 3

3.1 RESEARCH APPROACH ................................................................................................................ 2

3.1.1 ETHICAL CONSIDERATIONS ........................................................................................................... 3

3.2 SAMPLE ........................................................................................................................................... 4

3.3 MEASURING HEART RATE VARIABILITY .................................................................................... 5

3.4 MEASURING ELECTROENCEPHALOGRAPHY ............................................................................ 6

3.5 QUESTIONNAIRE ............................................................................................................................ 9

3.6 PERIPHERAL RECORDING AND DATA SYNCHING .................................................................... 9

3.7 OUTLINE OF PROCESS ................................................................................................................ 10

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3.7.1 PREPARATION ............................................................................................................................ 10
3.7.2 TESTING PROCEDURE ................................................................................................................. 11

3.7.2.1 E1 (baseline) ..................................................................................................................... 11

3.7.2.2 OF (open frame) ................................................................................................................ 11
3.7.2.3 E2 (comparative baseline) ................................................................................................ 12

3.8 OUTLINE OF DATA ANALYSIS .................................................................................................... 12

3.8.1 A MEANS PERSPECTIVE .............................................................................................................. 14
3.8.2 A DYNAMIC PERSPECTIVE ........................................................................................................... 14
3.8.3 A BIASING PERSPECTIVE............................................................................................................. 14

3.8.4 CORRELATING HEART AND BRAIN ................................................................................................. 15

3.8.5 STATISTICAL IMPLEMENTATION .................................................................................................... 16

3.9 REFERENCES ................................................................................................................................ 17

CHAPTER 4

4.1 INTRODUCTION TO RESULTS ....................................................................................................... 2

4.2 TECHNICAL SPECIFICATIONS ...................................................................................................... 3

4.2.1 EEG SPECIFICATIONS AND OUTLINE ............................................................................................... 3

4.2.2 HRV SPECIFICATIONS AND OUTLINE ............................................................................................... 5
4.2.3 STATISTICAL SPECIFICATIONS AND OUTLINE ................................................................................... 6
4.3 SAMPLE DEMOGRAPHICS AND DESCRIPTORS ........................................................................ 8
4.3.1 DEMOGRAPHIC DESCRIPTORS ....................................................................................................... 8
4.3.2 PERFORMANCE DESCRIPTORS ....................................................................................................... 9

4.4 A MEANS PERSPECTIVE ............................................................................................................... 9
4.4.1 GLOBAL EEG MEANS ................................................................................................................. 10
4.4.2 HEMISPHERIC EEG MEANS ......................................................................................................... 14

4.4.3 REGIONAL EEG MEANS .............................................................................................................. 16

4.5 A DYNAMIC PERSPECTIVE ......................................................................................................... 19

4.5.1 GLOBAL EEG DYNAMICS ............................................................................................................ 19

4.5.2 HEMISPHERIC EEG DYNAMICS .................................................................................................... 22
4.5.3 REGIONAL EEG DYNAMICS ......................................................................................................... 24
4.5.4 HRV DYNAMICS .......................................................................................................................... 27

4.6 A BIASING PERSPECTIVE ........................................................................................................... 30

4.6.1 GLOBAL TRENDS ......................................................................................................................... 35
4.6.1.1 Friedman analysis ............................................................................................................. 41

4.6.2 REGIONAL TRENDS ..................................................................................................................... 43

4.7 OVERALL FINDINGS ..................................................................................................................... 45

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4.8 REFERENCES ................................................................................................................................ 47
CHAPTER 5

5.1 RESEARCH CONTEXT AND RELATIVITY ..................................................................................... 2

5.2 INVESTIGATIVE UNDERTAKING ................................................................................................... 4

5.3 PALLIATIVE ASSOCIATIONS AND CONTEXTUAL IMPACT OF THE STUDY ............................ 5

5.3.1 REGARDING SYMMETRY AND LATERALIZATION ................................................................................ 6
5.3.2 REGARDING SPECTRAL DENSITY AND STATE OF MIND ...................................................................... 8
5.3.3 REGARDING ECONOMISATION AND LOBULAR FUNCTIONING ............................................................ 13

5.4 LIMITATIONS AND RECOMMENDATIONS FOR FURTHER RESEARCH ................................. 19

5.5 CONCLUSION ................................................................................................................................ 20
5.6 REFERENCES ................................................................................................................................ 21
APPENDICES

PARTICIPANT INFORMATION LEAFLET AND INFORMED CONSENT ........................................... A

QUESTIONAIRE AND INDEMNITY FORM .......................................................................................... B

FIGURE 32 ............................................................................................................................................. C

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LIST OF FIGURES

CHAPTER 2
FIGURE 1: AUTONOMIC INNERVATIONS TO THE HEART 118 SHOWING SYMPATHETIC AND PARASYMPATHETIC INNERVATIONS TO THE
DIFFERENT NODES (SA AND AV) OF THE HEART. ....................................................................................................... 4
FIGURE 2: VARIATION OF BEAT-TO-BEAT INTERVALS (R-R INTERVALS) IN THE QRS-COMPLEX ..................................................... 9

2
FIGURE 3: PSD GRAPH SHOWING THE DIFFERENT POWER BANDS AND THEIR RELATIVE POWER. ................................................ 11

32
FIGURE 4: THE STRUCTURE OF A NEURON. ................................................................................................................... 15

FIGURE 5: THE STAGES AND ASSOCIATED MEMBRANE POTENTIAL FLUCTUATIONS OF AN ACTION POTENTIAL AS MEASURED IN A GIANT
SQUID NEURON [ADOPTED FROM (34)]. ............................................................................................................... 17
FIGURE 6: THE SYNAPTIC JUNCTION SHOWING NEUROTRANSMITTER RELEASE INTO THE CLEFT IN PROPAGATION OF THE ACTION

120
POTENTIAL ARRIVING AT THE PRESYNAPTIC TERMINAL TO THE POSTSYNAPTIC NEURON. ............................................... 19

FIGURE 7: AN OUTLINE OF A CORTICAL PYRAMIDAL CELL DISPLAYING THE PATTERN OF CURRENT FLOW CAUSED BY EXCITATORY AND

INHIBITORY SYNAPTIC ACTIVATION. ..................................................................................................................... 20
FIGURE 8: APPROXIMATE RESISTIVITY AND THICKNESS OF THE THREE MAIN LAYERS OF THE HEAD (Ω = OHM). 40 ........................... 23
FIGURE 9: THE STANDARDIZED ELECTRODE PLACEMENT ACCORDING TO THE INTERNATIONAL 10-20 SYSTEM (BLACK DOTS) AND THE
35
MODIFIED COMBINATORIAL 10-10 SYSTEM (BLACK + WHITE DOTS) .......................................................................... 24

FIGURE 10: PHASE REVERSAL AS DEMONSTRATED IN A BIPOLAR MONTAGE (A); ABSOLUTE VOLTAGE AS DEMONSTRATED IN A

REFERENTIAL MONTAGE (B). .............................................................................................................................. 25

FIGURE 11: THE FOUR MOST DOMINANT, NORMAL BRAIN RHYTHMS IN DESCENDING ORDER OF FREQUENCIES, AND AT THEIR USUAL
AMPLITUDE RANGES. ......................................................................................................................................... 28
FIGURE 12: DYNAMIC INTERACTION BETWEEN NORMALISED DELTA EEG POWER (PANEL B) AND THE HIGH FREQUENCY COMPONENT

1
OF HRV (PANEL C) ACROSS SLEEP STAGES (PANEL A). ............................................................................................ 34

CHAPTER 3

4
FIGURE 13: THE ZEPHYR BIOHARNESS ........................................................................................................................... 6
FIGURE 14: THE EMOTIV EPOC EEG HEADSET. 15 ............................................................................................................. 7
FIGURE 15: ELECTRODE PLACEMENT OF THE EM OTIV HEADSET ........................................................................................... 8
FIGURE 16: THE DIFFERENT PHASES OF THE TESTING PROCEDURE. ....................................................................................... 11

CHAPTER 4

FIGURE 17: THE PASS BAND MAGNITUDE OF THE MANUALLY ALTERED FIR OFFSET (A) SET AT 39 HZ, SHOWING A FLAT PASSBAND

FROM 0.5-35 HZ; VERSUS DEFAULT OFFSETS SET AT 0.5-35 HZ (B). ........................................................................... 4
FIGURE 18: (I) ALPHA, (II) THETA AND (III) BETA BAND POWER BASELINE MEANS PER SUBJECT. COMPARISONS BETWEEN EO1 AND
EC2 FORM THE MAIN POINTS OF INTEREST. NORMALISED UNITS (N.U.). ...................................................................... 11
FIGURE 19: (IV) DELTA AND (V) SMR BAND POWER BASELINE MEANS PER SUBJECT. NORMALISED UNITS (N.U). ......................... 12

FIGURE 20: COMPOSITE POWER DISTRIBUTIONS FOR EACH FREQUENCY BAND AND STAGE OF BASELINE MEASUREMENTS. ............... 12

FIGURE 21: (I) ALPHA AND (II) THETA AVERAGED BASELINE POWERS FOR EACH HEMISPHERE ACROSS SUBJECTS. IN NORMALISED
UNITS(N.U). .................................................................................................................................................... 15

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