Probability Surface Plot
Geoffrey Stewart Morrison
BSc     MTS     MA     PhD

Research Associate in Forensic Speaker Recognition
School of Language Studies
Australian National Univeristy


| top |
| Research Interests |
| Research Projects |
| Selected Publications and Presentations |
| Forensic Speaker Recognition | Methodology & Software | Vowel Inherent Spectral Change | Speech Perception & Acoustics of Speech Production (First-Language, Second-Language, Cross-Language, Cross-Dialect) | Reviews | Other |
| Invited Talks |
| Workshops |
| Professional |
| Teaching |
| Paragliding |

Research
Interests

• Forensic phonetics
• Acoustic phonetics
• Statistical modelling
• Speech perception
• Cross-language and cross-dialect speech perception
• Second-language speech perception, production, and acquisition


Research
Projects

Catching Criminals by Their Voice: Combining Automatic and Traditional Methods for Optimum Performance in Forensic Speaker Recognition
Principal Investigator: Philip Rose, School of Language Studies, Australian National University


Cross-dialect and cross-language vowel production and perception
Collabotator: Paola Escudero, Insitute of Phonetic Sciences, University of Amsterdam



Selected Publications, Presentations, & Software:

Forensic Speaker Recognition


Likelihood-ratio-based forensic speaker comparison using parametric representations of vowel formant trajectories.
Morrison, G. S. (2008). Manuscript in preparation (coming soon).


Automatic-type calibration of traditionally derived likelihood ratios: Forensic analysis of Australian English /o/ formant trajectories.
Morrison, G. S., & Kinoshita, Y. (2008). Manuscript submitted for publication.


Forensic speaker recognition of Chinese /i/ and /y/ using likelihood ratios.
Zhang, C., Morrison, G. S., & Rose, P. (2008). Manuscript submitted for publication.


Forensic speaker recognition using likelihood ratios based on polynomial curves fitted to the formant trajectories of Australian English /aI/.
Morrison, G. S. (2008). Manuscript submitted for publication.


Methodology
&
Software


I also deal with methodological issues in other papers, but the papers listed in this section have methodology as their primary focus.


Matlab function which draws Tippett plots.
Morrison, G. S. (2008). [Software].


Matlab implementation of Aitken & Lucy's (2004) forensic likelihood-ratio software using multivariate-kernel-density estimation.
Morrison, G. S. (2007). [Software].


Comment on “A geometric representation of spectral and temporal vowel features: Quantification of vowel overlap in three linguistic varieties” [J. Acoust Soc. Am. 119, 2334–2350 (2006)] (L).
Morrison, G. S. (2008). Journal of the Acoustical Society of America. 123, 37–40.


Acoustic recording software for speech production experiments.
Morrison, G. S. (2007). [Software version 7.1].
(This is stand-alone software, you do not need to install Matlab or have a Matlab licence.)


Logistic regression modelling for first- and second- language perception data.
Morrison, G. S. (2007). In M. J. Solé, P. Prieto, & J. Mascaró (Eds.), Segmental and prosodic issues in Romance phonology (pp. 219–236). Amsterdam: John Benjamins.

A multinomial logistic regression function is now avaialble in the Matlab Statistics Toolbox. I have provided versions of some of the sample software making use this function. T. M. Nearey's software allows for more control over the specification of the logistic regression model, in particular it allows one to specify diphone-biassed models. Matlab is required to run software. Zipped files which include Nearey's software are password protected. Contact me to get the password.


A cross-language vowel normalisation procedure.
Morrison, G. S., & Nearey, T. M. (2006). Canadian Acoustics 34(3), 94–95.
[Proceedings of the Canadian Acoustical Association Conference 2006, Halifax, Nova Scotia, Canada]


An adaptive sampling procedure for speech perception experiments.
Morrison, G. S. (2006). In Proceedings of the Ninth International Conference on Spoken Language Processing: Interspeech 2006 — ICSLP, Pittsburgh, Pennsylvania, USA (pp. 857-860). Bonn, Germany: ISCA.


An appropriate metric for cue weighting in L2 speech perception: Response to Escudero & Boersma (2004).
Morrison, G. S. (2005). Studies in Second Language Acquisition, 27, 597–606.


Vowel
Inherent
Spectral
Change


I also deal with VISC in other papers, but the papers in this section have VISC as a primary focus.


Theories of vowel inherent spectral change: A review.
Morrison, G. S. (2007). Submitted for publication.


Testing theories of vowel inherent spectral change.
Morrison, G. S., & Nearey, T. M. (2007). Journal of the Acoustical Society of America, 122, EL15–EL22.


L1-Spanish speakers’ acquisition of the English /i/–/I/ contrast II: Perception of vowel inherent spectral change.
Morrison, G. S. (In Press). Language & Speech.



Speech
Perception
&
Acoustics
of
Speech
Production


First-Language


Second-Language


Cross-Language


Cross-Dialect


Complexity of acoustic-production-based models of speech perception.
Morrison, G. S. (In Press). Proceedings of Acoustics’08.


Perception of synthetic vowels by monolingual Canadian-English, Mexican-Spanish, and Peninsular-Spanish listeners.
Morrison, G. S. (2008). Submitted for publication.


L1-Spanish speakers’ acquisition of the English /i/–/I/ contrast II: Perception of vowel inherent spectral change.
Morrison, G. S. (In Press). Language & Speech.


L1-Spanish speakers’ acquisition of the English /i/–/
I/ contrast: Duration-based perception is not the initial developmental stage.
Morrison, G. S. (In Press). Language & Speech, 51(4).


A comparison of some North-Central-Peninsular-Spanish and Western-Canadian-English vowels.
Morrison, G. S. (2007). Draft manuscript.


A cross-dialect comparison of Peninsula- and Peruvian-Spanish vowels.
Morrison, G. S., & Escudero, P. (In Press - 2007). Proceedings of the 16th International Congress of Phonetic Sciences: Saarbrücken 2007.


L1 & L2 production and perception of English and Spanish vowels: A statistical modelling approach.
Morrison, G. S. (2006). Doctoral dissertation, University of Alberta, Edmonton, Alberta, Canada.


Methodological issues in L2 perception research, and vowel spectral cues in Spanish listeners’ perception of word-final /t/ and /d/ in Spanish.
Morrison, G. S. (2006). In M. Diaz-Campos (Ed.), Selected Proceedings of the 2nd Conference on Laboratory Approaches to Spanish Phonetics and Phonology (pp. 35–47). Somerville, MA: Cascadilla Proceedings Project.


Dat is what the PM said: A quantitative analysis of Prime Minister Chrétien’s pronunciation of English voiced dental fricatives.
Morrison, G. S. (2005). Cahiers linguistiques d’Ottawa, 33, 1–21. Ottawa, Ontario: University of Ottawa, Department of Linguistics.


Principles for a quantitative speech learning model.
Morrison, G. S. (2005, November). Poster presented at the Workshop on Models of L1 and L2 Phonetics/Phonology, Utrecht, The Netherlands.


Towards a Quantitative Speech Learning Model.
Morrison, G. S. (2005, May). Poster presented at the 1st ASA Workshop on Second Language Speech Learning, Vancouver, British Columbia, Canada.


Aprendizaje de las vocales inglesas /i/ e /I/ por hispanohablantes.
Morrison, G. S. (2005, June). Talk given at the University of the Basque Country, Vitoria-Gasteiz, Autonomous Region of the Basque Country, Spain. 


Spanish listeners’ perceptual patterns for English /i/ and /I/.
Morrison, G. S. (2005, May). Poster presented at the 149th Meeting of the Acoustical Society of America, Vancouver, British Columbia, Canada. 


An acoustic and statistical analysis of Spanish mid-vowel allophones.
Morrison, G. S. (2004). Estudios de Fonética Experimental, 13, 11–37.


Perception and production of Spanish vowels by English speakers.
Morrison, G. S. (2003). In M. J. Solé, D. Recansens, & J Romero (Eds.), Proceedings of the 15th International Congress of Phonetic Sciences: Barcelona 2003 (pp. 1533–1536). Adelaide, South Australia: Causal Productions.


Spanish listeners’ use of vowel spectral properties as cues to post-vocalic consonant voicing in English.
Morrison, G. S. (2002). In Collected Papers of the First Pan-American/Iberian Meeting on Acoustics [CD-ROM]. Mexico, DF: Mexican Institute of Acoustics.


Effects of L1 duration experience on Japanese and Spanish listeners’ perception of English high front vowels.
Morrison, G. S. (2002). Master’s thesis, Simon Fraser University, Burnaby, British Columbia, Canada.


Perception of English /i/ and /I/ by Japanese & Spanish listeners: Longitudinal results.
Morrison, G. S. (2002). In G. S. Morrison, & L. Zsoldos (Eds.), Proceedings of the North West Linguistics Conference 2002 (pp. 29–48). Burnaby, BC: Simon Fraser University Linguistics Graduate Student Association.


Japanese listeners’use of duration cues in the identification of English high front vowels.
Morrison, G. S. (2002). In J. Larson, & M. Paster (Eds.), Proceedings of the 28th Annual Meeting of the Berkeley Linguistics Society (pp. 189–200). Berkeley, CA: Berkeley Linguistics Society.

  • The thesis and two papers above use discriminant analysis to model perception data, a more appropriate technique would be logistic regression.


Perception of English /i/ and /I/ by Japanese listeners.
Morrison, G. S. (2002). In S. Oh, N. Sawai, K. Shiobara, & R. Wojak (Eds.), University of British Columbia Working Papers in Linguistics Volume 8: Proceedings of NWLC 2001: Northwest Linguistics Conference (pp. 113-131). Vancouver, BC: University of British Columbia, Department of Linguistics.
 


Reviews


[Review of Phonetically based phonology by B. Hayes, R. Kirchner, & D. Steriade (Eds.)].
Morrison, G. S. (2005). Linguist List, 16, 1400.


[Review of The sounds of language: An introduction to phonetics by H. Rogers].
Morrison, G. S. (2001, June). TEAL News, 23-25, 28.


Other


Phonetic naturalness and phonological learnability.
Morrison, G. S., & Kirchner, R. (2006). Manuscript submitted for publication.


Teaching the classical Hebrew stem system: The binyanim
Morrison, G. S. (1995). Master’s thesis, Vancouver School of Theology, Vancouver, BC, Canada.




Invited
Talks

I currently have two presentations prepared for invited talks, one on forensic speaker recognition, and the other on L2 speech perception. Each can fill a time slot of one to one-and-a-half hours depending on the number of questions. I encourage audience members to ask questions as we go along.

Likelihood-ratio-based Forensic Speaker Comparison

Spanish speakers’ perception and pronunciation of the English /i/–/I/ contrast


Workshops

I can present workshops on research methodology. Workshops may be divided into several sessions with each session focussing on a different research technique. Workshops will be based on research tecnhiques which I have used in my own research, and participants will be asked to read some of the relevant papers prior to the workshop.


Professional

Curriculum Vitae


Teaching

University of Alberta, LING 205 Practical Phonetics, Spring 2006



Sydney, NSW, Australia

Please contact me if you are an academic researcher and would like to make use of my data or software.

I welcome opportunities to collaborate on research. For example, if you have data I may be able to help with analysis.





Paragliding



Page last updated 28 April 2008

| top |
| Research Interests |
| Research Projects |
| Selected Publications and Presentations |
| Forensic Speaker Recognition | Methodology & Software | Vowel Inherent Spectral Change | Speech Perception & Acoustics of Speech Production (First-Language, Second-Language, Cross-Language, Cross-Dialect) | Reviews | Other |
| Invited Talks |
| Workshops |
| Professional |
| Teaching |
| Paragliding |