Dr Trent Lewis

Trent interacting with his virtual-self

Position/s:	Lecturer School of Computer Science, Engineering and Mathematics
Phone:	work+61 8 82013867
Email:	trent.lewis@flinders.edu.au
Location:	Information, Science & Technology (367)
Postal address:	GPO Box 2100, Adelaide 5001, South Australia

Biography

Trent is a cognitive scientist who has broad interests in human and machine learning. Primarily a computer scientist, Trent completed a PhD in 2005 in the area of audio-visual speech processing. His thesis involved research in dynamic weighting, classifier combination, confidence estimation and combination, and the use of linguistic distinctive features as units for fusion.

Trent is currently employed as a postdoctoral research fellow on the Thinking Head project. A multi-instituional project, Trent is responsible for the development of the audio-visual sensing capacities of the Head. Trent is now also involved in a Flinder's spin out company, CleverMe, to commercialize "virtual pal" technology.

Trent relishes cross disciplinary research, the Thinking Head project a prime example, and works with engineers, neurologists, and biologists as part of an EEG research team investigating the neural correlates of mental diseases and the effect EMG has on EEG using signal processing and data visualisation techniques.

Qualifications

Ph.D., Flinders University (2005)
B.Sc.(Hons) in Computer Science, Flinders University (2001)
B.Sc. in Cognitive Science, Flinders University (2000)

Teaching

Topic Coordinator:

COMP2741 Application Development
COMP2761 Database and Conceptual Modelling
COMP8741 Application Development GE
COMP8761 Database and Conceptual Modelling GE

Topic Lecturer:

COMP2741 Application Development
COMP2761 Database and Conceptual Modelling
COMP7019 Embodied Conversational Agents
COMP8741 Application Development GE
COMP8761 Database and Conceptual Modelling GE

Research and supervision

Research expertise

Artificial intelligence and image processing
Cognitive science
Linguistics
Neurosciences

Research interests

Audio-Visual Speech Processing (Human and Machine)
Machine Learning
Mulit-modal Fusion
Classifier Fusion and Confidence Estimation
Embodied Conversational Agents

Publications

Book chapters

Anderson, T.A.F., Chen, Z.-H., Wen, Y.-F., Milne, M., Atyabi, A., Treharne, K., et al. (2012). Thinking Head MulSeMedia: A Storytelling Environment for Embodied Language Learning. In George Ghinea, Frederic Andres and Stephen Gulliver, ed. Multiple Sensorial Media Advances and Applications: New Developments in MulSeMedia. Hershey, Pennsylvania: IGI Global, pp. 182-203. [online]. Available from: http://dx.doi.org/10.4018/978-1-60960-821-7.ch009.

Milne, M.K., Luerssen, M., Lewis, T., Leibbrandt, R. and Powers, D. (2011). Designing and Evaluating Interactive Agents as Social Skills Tutors for Children with Autism Spectrum Disorder. In Diana Perez-Marin and Ismael Pascual-Nieto, ed. Conversational Agents and Natural Language Interaction: Techniques and Effective Practices. Hershey, USA: IGI Global, pp. 23-48. [online]. Available from: http://dx.doi.org/10.4018/978-1-60960-617-6.ch002.

Milne, M.K., Luerssen, M., Leibbrandt, R., Lewis, T. and Powers, D. (2011). Embodied Conversational Agents for Education in Autism. In Mohammad-Reza Mohammadi, ed. A Comprehensive Book on Autism Spectrum Disorders. Rijeka, Croatia: InTech, pp. 387-412. [online]. Available from: http://dx.doi.org/10.5772/18688.

Refereed journal articles

Fitzgibbon, S.P., Lewis, T., Powers, D., Whitham, E., Willoughby, J. and Pope, K. (2013). Surface Laplacian of Central Scalp Electrical Signals is Insensitive to Muscle Contamination. IEEE Transactions On Biomedical Engineering, 60(1), pp.4-9. [online]. Available from: http://dx.doi.org/10.1109/TBME.2012.2195662.

Whitham, E., Fitzgibbon, S.P., Lewis, T., Pope, K., DeLosAngeles, D., Clark, C., et al. (2011). Visual experiences during paralysis. Frontiers in Human Neuroscience, 5(160). [online]. Available from: http://dx.doi.org/10.3389/fnhum.2011.00160.

Pope, K., Fitzgibbon, S.P., Lewis, T.W., Whitham, E.M. and Willoughby, J.O. (2009). Relation of gamma oscillations in scalp recordings to muscular activity. Brain Topography, 22(1), pp.13-17. [online]. Available from: http://dx.doi.org/10.1007/s10548-009-0081-x.

Broberg, I.M., Pope, K., Lewis, T.W., Olsson, T., Nilsson, M. and Willoughby, J.O. (2008). Cell swelling precedes seizures induced by inhibition of astrocytic metabolism. Epilepsy Research, 80(2-3), pp.132-141. [online]. Available from: http://dx.doi.org/10.1016/j.eplepsyres.2008.03.012.

Whitham, E.M., Lewis, T.W., Pope, K., Fitzgibbon, S.P., Clark, C.R., Loveless, S.J., et al. (2008). Thinking activates EMG in scalp electrical recordings. Clinical Neurophysiology, 119, pp.1166-1175. [online]. Available from: http://linkinghub.elsevier.com/retrieve/pii/S138824570800045X.

Whitham, E.M., Pope, K., Fitzgibbon, S.P., Lewis, T.W., Clark, C.R., Loveless, S.J., et al. (2007). Scalp electrical recording during paralysis: Quantitative evidence that EEG frequencies above 20 Hz are contaminated by EMG. Clinical Neurophysiology, 118(8), pp.1877-1888. [online]. Available from: http://dx.doi.org/10.1016/j.clinph.2007.04.027.

Lewis, T.W. and Powers, D.M. (2003). Audio-Visual Speech Recognition using Red Exclusion an Neural Networks. Journal of Research and Practice in Information Technology, 35(1), pp.41-64. [online]. Available from: http://www.jrpit.acs.org.au/jrpit/JRPIT35.1.41.pdf.

Show all publications

Book chapters

Refereed journal articles

Refereed conference papers

Lewis, T.W., Luerssen, M., Fitzgibbon, S. and Powers, D. (2012). Audio Visual Speaker Association for Embodied Conversational Agents. In F Cox, K Demuth, S Lin, K Miles, S Palethrope, J Shaw & I Yuen, ed. Proceedings of the 14th Australasian International Conference on Speech Science and Technology. 14th Australasian International Conference on Speech Science and Technology. pp. 121-124. [online]. Available from: http://assta.org/sst/SST-12/WELCOME.PDF.

Cottrell, J.M., Fitzgibbon, S., Lewis, T. and Powers, D.M. (2012). Investigating a Gaze-Tracking Brain Computer Interface Concept Using Steady State Visually Evoked Potentials. In Spring World Congress on Engineering and Technology: Proceedings. SCET2012. [online]. Available from: http://dx.doi.org/10.1109/SCET.2012.6341890.

Ali, H., Powers, D., Leibbrandt, R. and Lewis, T.W. (2011). Comparison of Region Based and Weighted Principal Component Analysis and Locally Salient ICA in Terms of Facial Expression Recognition. In Lee, Roger, ed. Software Engineering, Artificial Intelligence, Networking and Parallel/Distributed Computing 2011. Twelfth International Conference on Software Engineering, Artificial Intelligence, Networking and Parallel/Distributed Computing 2011. pp. 81-89. [online]. Available from: http://dx.doi.org/10.1007/978-3-642-22288-7_7.

Burnham, D., Estival, D., Fazio, S., Viethen, J., Cox, F., Dale, R., et al. (2011). Building an audio-visual corpus of Australian English: large corpus collection with an economical portable and replicable Black Box. In Piero Cosi, Renato De Mori, Giuseppe Di Fabbrizio, and Roberto Pieraccini, ed. Interspeech 2011, Proceedings of the 12th Annual Conference of the International Speech Communication Association. 12th Annual Conference of the International Speech Communication Association. pp. 841-844. [online]. Available from: http://www.isca-speech.org/archive/interspeech_2011/i11_0841.html.

Wagner, M., Tran, D., Togneri, R., Rose, P., Powers, D.M., Onslow, M., et al. (2010). The Big Australian Speech Corpus (The Big ASC). In Marija Tabain, Janet Fletcher, David Grayden, John Hajek and Andy Butcher, ed. Proceedings of the 13th Australasian International Conference on Speech Science and Technology. 13th Australasian International Conference on Speech Science and Technology. pp. 166-170. [online]. Available from: http://assta.org/sst/SST-10/SST2010/PDF/AUTHOR/ST100044.PDF.

Powers, D.M., Luerssen, M.H., Lewis, T.W., Leibbrandt, R.E., Milne, M.K., Pashalis, J., et al. (2010). MANA for the Ageing. In Proceedings of the 2010 Workshop on Companionable Dialogue Systems, ACL 2010. Workshop on Companionable Dialogue Systems. pp. 7-12. [online]. Available from: http://www.aclweb.org/anthology/W10-2702.

Newman, W., Franzel, D., Matsumoto, T., Leibbrandt, R.E., Lewis, T.W., Luerssen, M.H., et al. (2010). Hybrid World Object Tracking For A Virtual Teaching Agent. In Proceedings of the International Joint Conference on Neural Networks 2010. WCCI 2010 IEEE World Congress on Computational Intelligence. pp. 2244-2252.

Milne, M.K., Luerssen, M.H., Lewis, T.W., Leibbrandt, R.E. and Powers, D.M. (2010). Development of a Virtual Agent Based Social Tutor for Children with Autism Spectrum Disorders. In Proceedings of the International Joint Conference on Neural Networks 2010. WCCI 2010 IEEE World Congress on Computational Intelligence. pp. 1555-1563.

Luerssen, M.H., Lewis, T.W. and Powers, D.M. (2010). Head X: Customizable Audiovisual Synthesis for a Multi-purpose Virtual Head. In R. Goebel, J. Siekmann, W. Wahlstar, ed. AI 2010: Advances in Artificial Intelligence. 23rd Australasian Joint Conference on Artificial Intelligence. pp. 486-495.

Burnham, D.K., Ambikairajah, E., Arciuli, J., Bennamoun, M., Best, C.T., Bird, S., et al. (2009). A blueprint for a comprehensive Australian English auditory-visual speech corpus. In Michael Haugh, Kate Burridge, Jean Mulder, and Pam Peters, ed. Selected proceedings of the 2008 HCSNet workshop on designing the Australian national corpus?: mustering languages. Workshop on Designing the Australian National Corpus. pp. 96-107. [online]. Available from: http://www.lingref.com/cpp/ausnc/2008/index.html.

Lewis, T.W. and Powers, D.M. (2008). Distinctive Feature Fusion for Recognition of Australian English Consonants. In Interspeech 2008. Interspeech 2008. pp. 2671-2674.

Powers, D.M., Leibbrandt, R.E., Luerssen, M.H., Lewis, T.W. and Lawson, M.J. (2008). PETA: a pedagogical embodied teaching agent. In Fillia Makedon, Lynne Baillie, Ilias Maglogiannis, Grammati Pantziou, Vangelis Karkaletsis, Richard Billo, ed. 1st International Conference on Pervasive Technologies Related to Assistive Environments, PETRA 2008. 1st International Conference on Pervasive Technologies Related to Assistive Environments, PETRA 2008.

Powers, D.M., Leibbrandt, R.E., Pfitzner, D.M., Luerssen, M.H., Lewis, T.W., Stevens, K., et al. (2008). Language Teaching in a Mixed Reality Games Environment. In Fillia Makedon, Lynne Baillie, Grammati Pantziou, Ilias Maglogiannis, ed. 1st International Conference on Pervasive Technologies Related to Assistive Environments, PETRA 2008. 1st International Conference on Pervasive Technologies Related to Assistive Environments, PETRA 2008.

Leibbrandt, R.E., Luerssen, M.H., Matsumoto, T., Treharne, K., Lewis, T.W., Santi, M.L., et al. (2008). An immersive game-like teaching environment with simulated teacher and hybrid world. In Edmond Prakash, ed. Animation, multimedia, IPTV and edutainment: proceedings of CGAT '08. Animation, multimedia, IPTV and edutainment: Computer Games and Allied Technology (CGAT) Conference. pp. 215-222.

Lewis, T.W. and Powers, D.M. (2005). Distinctive feature fusion for improved audio-visual phoneme recognition. In A. Bouzerdoum and A. Beghdadi, ed. Proceedings of the 8th International Symposium on Signal Processing and Its Applications. The Eighth International Symposium on Signal Processing and Its Applications. pp. 62-65.

Lewis, T.W. and Powers, D.M. (2004). Sensor Fusion Weighting Measures in Audio-Visual Speech Recognition. In Vladimir Estivill-Castro, ed. Proceedings of the Twenty-Seventh Australasian Computer Science Conference (ACSC2004), Dunedin, New Zealand. CRPIT, 26 (1). Twenty-Seventh Australiasian Computer Science Conference (ACSC2004). CRPIT. [online]. Available from: http://crpit.com/confpapers/CRPITV26Lewis.pdf.

Lewis, T.W. and Powers, D.M. (2002). Audio-Visual Speech Recognition Using Red Exclusions and Neural Networks. In Proceedings of the twenty-fifth Australasian conference on Computer science 2002. Conferences in Research and Practice in Information Technology 25th Australasian Computer Science Conference. pp. 149-156.

Lewis, T.W. and Powers, D.M. (2002). A Multifaceted Investigation into Speech Reading. In Advances in Soft Computing: Hybrid Information Systems. 1st International Workshop on Hybrid Intelligent Systems.

Lewis, T.W. and Powers, D.M. (2001). Lip Feature Extraction Using Red Exclusion. In Eades, P; Jin, J, ed. Conferences in Research and Practice in Information Technology: Visualisation 2000 - Selected Papers from the Pan-Sydney Workshop on Visual Information Processing. Pan-Sydney Workshop on Visual Information Processing 2000.

Conference publications

Luerssen, M.H., Leibbrandt, R.E., Lewis, T.W., Pashalis, J., Treharne, K., Pfitzner, D.M., et al. (2009). MANA - An Embodied Calendar for the Aged. In Thinking Systems Joint Symposium. Thinking Systems Joint Symposium. pp. 127-127.

Luerssen, M.H. and Lewis, T.W. (2009). Head X: Tailorable Audiovisual Synthesis for ECAs. In Proc. HCSNet SummerFest 2009. HCSNet Workshop on Interacting with Intelligent Virtual Characters. [online]. Available from: http://sf09.hcsnet.edu.au/summerfest09/iivc09.

Luerssen, M.H., Lewis, T.W. and Powers, D.M. (2009). Head X and the Thinking Media Framework. In Thinking Systems Joint Symposium. Thinking Systems Joint Symposium. pp. 122-122.

Luerssen, M.H., Lewis, T.W. and Powers, D.M. (2009). Working with the Prosthetic Head. In Thinking Systems Joint Symposium. Thinking Systems Joint Symposium. pp. 123-124.

Whitham, E.M., Fitzgibbon, S.P., DeLosAngeles, D., Lewis, T.W., Pope, K., Clark, C.R., et al. (2009). Experiences during paralysis?: vision and humour. In Australian Neuroscience Society Inc. 29th Annual Meeting. Australian Neuroscience Society Inc. 29th Annual Meeting.

Luerssen, M.H., Lewis, T.W. and Powers, D.M. (2009). Enabling the Evolution of the Thinking Head. In Thinking Systems Joint Symposium. Thinking Systems Joint Symposium. pp. 126-126.

Abrahamyan, A., Davis, C., Fordyce, A., Gibert, G., Howell, C., Kim, J., et al. (2009). Evaluation methods. In Thinking Systems Joint Symposium. Thinking Systems Joint Symposium. pp. 81-83.

Lewis, T.W., Luerssen, M.H. and Powers, D.M. (2009). Which one of you said that? In Thinking Systems Joint Symposium. Thinking Systems Joint Symposium. pp. 121-121.

Luerssen, M.H., Lewis, T.W., Leibbrandt, R.E. and Powers, D.M. (2008). Adaptive multimodal perception for a virtual museum guide. In 3rd Workshop on Artificial Intelligence Techniques for Ambient Intelligence. 3rd Workshop on Artificial Intelligence Techniques for Ambient Intelligence. [online]. Available from: http://www.infj.ulst.ac.uk/~jcaug/program.pdf.

Willoughby, J.O., Broberg, I.M., Pope, K., Wallace, A.K., Witham, E.M., Fitzgibbon, S.P., et al. (2007). EEG Gamma and other rhythms and astrocyte swelling: pathways to seizures. In Proceedings of the 6th Asian & Oceanian Epilepsy Congress. 6th Asian & Oceanian Epilepsy Congress.

Witham, E.M., Pope, K., Fitzgibbon, S.P., Lewis, T.W., Clark, C.R., Loveless, S.J., et al. (2007). Scalp EEG during paralysis: augmented gamma activity can be detected during cognitive processing. In Proceedings of the Scientific Meeting of the International Brain Research Organisation. Scientific Meeting of the International Brain Research Organisation, Melbourne.

Smith, D., Williams, G., Burston, J.M., Pope, K., Clark, C.R., Loveless, S.J., et al. (2007). Electroencephalographic changes during states of Buddhist concentrative meditation. In Proceedings of the Scientific Meeting of the Internationall Brain Research Organisation. Scientific Meeting of the Internal Brain Research Organisation.

Broberg, I.M., Van De Riet, S., Pope, K., Lewis, T.W., Olsson, T., Nilsson, M., et al. (2007). Preictal cell-swelling: the first sign of seizure onset [abstract]. In 7th IBRO World Congress of Neuroscience. 7th IBRO World Congress of Neuroscience. pp. 187-187.

Whitham, E.M., Broberg, I.M., Pope, K., Fitzgibbon, S.P., Lewis, T.W., Loveless, S.J., et al. (2006). Migraine and epilepsy: support for a pathophysiological link. In 21st Annual Scientific Meeting of the Epilepsy Society of Australia. 21st Annual Scientific Meeting of the Epilepsy Society of Australia.

Willoughby, J.O., Broberg, I.M., Pope, K., Wallace, A.K., Whitham, E.M., Loveless, S.J., et al. (2006). Gamma band involvement in animal models and humans with generalized epilepsies. In Clinical EEG and Neuroscience?: proceedings abstracts. ECNS and ISNIP Joint Meeting 2006. pp. 266-266.

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