Database selection for forensic voice comparison.
Morrison, G. S., Ochoa, F., & Thiruvaran, T. (2012 in press). Proceedings of Odyssey 2012: The Language and Speaker Recognition Workshop, Singapore.

• 
  

What did Bain really say? A preliminary forensic analysis of the disputed utterance based on data, acoustic analysis, statistical models, calculation of likelihood ratios, and testing of validity.
Morrison, G. S., & Hoy, M. C. (2012 in press). Proceedings of the 46th Audio Engineering Society (AES) Conference on Audio Forensics: Recording, Recovery, Analysis, and Interpretation, Denver, CO.

• 
  

Protocol for the collection of databases of recordings for forensic-voice-comparison research and practice.
Morrison, G. S., Rose, P., & Zhang, C. (2012). Australian Journal of Forensic Sciences, XX, xxx–xxx.
doi:10.1080/00450618.2011.630412

• 
  

The likelihood-ratio framework and forensic evidence in court: A response to R v T.
Morrison, G. S. (2012). International Journal of Evidence and Proof, 16, 1–29.
doi:10.1350/ijep.2012.16.1.390

• 
  
  
• Erratum: Table 1, fourth line of numbers should read: “1000–10 000”, not “100–10 000”
  

Forensic voice comparison using Chinese /iau/.
Zhang, C., Morrison, G.S., & Thiruvaran, T. (2011). Proceedings of the17th International Congress of Phonetic Sciences, Hong Kong, China, 2280–2283.

Humans versus machine: Forensic voice comparison on a small database of Swedish voice recordings.
Lindh, J., & Morrison, G.S. (2011). Proceedings of the17th International Congress of Phonetic Sciences, Hong Kong, China, 1254–1257.

Measuring the validity and reliability of forensic likelihood-ratio systems.
Morrison, G.S. (2011). Science & Justice, 51, 91–98.
doi:10.1016/j.scijus.2011.03.002

• 
  
  
• Matlab Code: CI_calcs 2011-03-30.

A comparison of procedures for the calculation of forensic likelihood ratios from acoustic-phonetic data: Multivariate kernel density (MVKD) versus Gaussian mixture model - universal background model (GMM-UBM).
Morrison, G.S. (2011). Speech Communication, 53, 242–256.
doi:10.1016/j.specom.2010.09.005

• 
  
  
• Matlab Code: MVKD_v_GMM-UBM 2010-02-19

An issue in the calculation of logistic-regression calibration and fusion weights for forensic voice comparison.
Morrison, G.S., Thiruvaran, T., & Epps, J. (2010). Proceedings of the 13th Australasian International Conference on Speech Science and Technology, Melbourne, 74–77.

Forensic voice comparison.
Morrison, G.S. (2010). In I. Freckelton, & H. Selby (Eds.), Expert Evidence (Ch. 99). Sydney, Australia: Thomson Reuters.

Estimating the precision of the likelihood-ratio output of a forensic-voice-comparison system.
Morrison, G.S., Thiruvaran, T., & Epps, J. (2010). Proceedings of Odyssey 2010: The Speaker and Language Recognition Workshop, Brno, 63–70.

• Matlab Code: CI_calcs 2011-03-30.

An empirical estimate of the precision of likelihood ratios from a forensic-voice-comparison system.
Morrison, G.S., Zhang, C., & Rose, P. (2011). Forensic Science International, 208, 59–65.
doi:10.1016/j.forsciint.2010.11.001

Comparación forense de la voz y el cambio de paradigma.
Morrison, G.S. (2011). CSIC/UIMP Posgrado Oficial en Estudios Fónicos Cuadernos de Trabajo, 1, 1–38. [Translation by Curiá C. of: Morrison, G.S. (2009). Forensic voice comparison and the paradigm shift. Science & Justice, 49, 298–308.]

Forensic voice comparison and the paradigm shift.
Morrison, G.S. (2009). Science & Justice, 49, 298–308.
doi:10.1016/j.scijus.2009.09.002

Comments on Coulthard & Johnson’s (2007) portrayal of the likelihood-ratio framework.
Morrison, G.S. (2009). Australian Journal of Forensic Sciences, 41, 155–161.
doi:10.1080/00450610903147701

A reponse to the UK position statement on forensic speaker comparison.
Rose, P., & Morrison, G.S. (2009). International Journal of Speech, Language and the Law, 16, 139–163.
doi:10.1558/ijsll.v16i1.139

Likelihood-ratio-based forensic speaker comparison using parametric representations of vowel formant trajectories.
Morrison, G.S. (2009). Journal of the Acoustical Society of America, 125, 2387–2397.
doi:10.1121/1.3081384

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Automatic-type calibration of traditionally derived likelihood ratios: Forensic analysis of Australian English /o/ formant trajectories.
Morrison, G.S., & Kinoshita, Y. (2008). Proceedings of Interspeech 2008 (pp. 1501–1504). International Speech Communication Association.

Forensic speaker recognition of Chinese /i/ and /y/ using likelihood ratios.
Zhang, C., Morrison, G.S., & Rose, P. (2008). Proceedings of Interspeech 2008 (pp. 1937–1940). International Speech Communication Association.

Forensic voice comparison using likelihood ratios based on polynomial curves fitted to the formant trajectories of Australian English /aI/.
Morrison, G.S. (2008). International Journal of Speech, Language and the Law, 15, 249–266.
doi:10.1558/ijsll.v15i2.249

Incorrect versions of Figures 3 and 4 were printed in the paper version. These have been corrected in the online vesion.

Forensic database of audio recordings of 68 female speakers of Standard Chinese.
Zhang, C., & Morrison, G.S. (2011).

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

If you use my software for research please let me know and give me credit in published papers.

Credible interval calculation

• Matlab Code: CI_calcs 2011-03-30.
  

Sound file cutter upper.
Morrison, G.S. (2010). [Software release 2010-12-02].

• Matlab Code: cut_up_soundfiles 2010-12-02.
  
  
• Compiled: cut_up_soundfiles 2010-03-14 .
  

train_llr_fusion_robust.m
Morrion, G.S. [Software release 2009-07-02]

Robust version of train_llr_fusion.m from Niko Brümmer’s FoCal Toolbox. This version can handle cases of complete separation.

• Matlab function
  

Analysis of categorical response data: Use logistic regression rather than endpoint-difference scores or discriminant analysis (L).
Morrison, G.S., & Kondaurova, M.V. (2009). Journal of the Acoustical Society of America, 126, 2159–2162.
doi:10.1121/1.3216917

Logistic regression software for speech percepton data.
Morrison, G.S. (2009). [Software release 2009-03-13].

Includes data to run analyses from Morrison & Kondaurova (2009).

• Matlab Code: Logistic Regression Software 2009-03-13
  
  
• Compiled: Logistic Regression Software 2009-03-13
  

FormantMeasurer: Software for efficient human-supervised measurement of formant trajectories.
Morrison, G.S., & Nearey, T.M. (2011). [Software release 2011-05-26].

• Matlab Code: FormantMeasurer 2011-05-26
  
  
• Compiled: FormantMeasurer 2008-05-23
  
  
• Sample sound and marker files: SoundFiles

SoundLabeller: Ergonomically designed software for marking and labelling portions of sound files.
Morrison, G.S. (2010). [Software release 2011-04-03].

• Matlab Code: SoundLabeller 2011-04-03
  
  
• Compiled: SoundLabeller 2010-01-15

Acoustic recording software for speech production experiments.
Morrison, G.S. (2008). [Software release 2008-12-23].

• Matlab Code: AcousticRecording 2008-12-23
  
  
• Compiled: AcousticRecording 2008-12-23
  
  
• Chinese language files (Chinese version of Windows required)
  
  
• An alternative you may also want to try: BAS SpeechRecorder

Matlab function which draws Tippett plots.
Morrison, G.S. (2008, 2009). [Software release 2009-11-18].

• Matlab function
  

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

• Matlab function
  
  
• prepublication version of Aitken, C. G. G, & Lucy, D. (2004) Evaluation of trace evidence in the form of multivariate data. Applied Statistics, 54, 109–122.

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.
doi:10.1121/1.2804633

• prepublication version including footnotes which were removed from the final version because of space constraints
  
  
• Matlab function
  
  
• Matlab function also available at American Institute of Physics Electronic Physics Auxiliary Publication Service (EPAPS): E-JASMAN-123-001801
  
  
• The following article may also be of interest:
  Gorshi, S., Vaseghi, S., & Yan, Q. (2008) Cross-entropic comparison of formants of British, Australian and American English accents. Speech Communication, 50, 564–579. [DOI:10.1016/j.specom.2008.03.013]

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 the software. Zipped files which include Nearey's software are password protected. Contact me to get the password. See also Logistic regression Software above.

• Logistic regression software to run analysis of hypothetical VOT data: download StatisticsToolbox version
  
  
• Logistic regression software to run analyses of Álvarez González (1980) data: download StatisticsTooblox version
  
  
• Logistic regression software programmed by T. M. Nearey: download
  
  
• Logistic regression software to run analyses of hypothetical VOT data and Álvarez González (1980) data: download Nearey version
  
  
• Logistic regression software to run analyses of Escudero & Boersma (2004) data: download Nearey version
  
  
• Logistic regression software to run analyses of Bion, Escudero, & Morrison (2008) data [not part of the tutorial paper, but provides examples of different (simpler?) drivers for the logistic regression function]: download Nearey version
  

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]

• presentation slides
  
  
• Matlab function Release 2008-12-29

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.

• poster
  

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.

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

Vowel inherent spectral change.
Morrison, G.S., & Assmann, P.F. (Eds.) (In Prep). Book in preparation for publication by Springer-Verlag, Heidelberg.

chapter outlines

Likelihood-ratio-based forensic speaker comparison using parametric representations of vowel formant trajectories.
Morrison, G.S. (2009). Journal of the Acoustical Society of America, 125, 2387–2397.
doi:10.1121/1.3081384

• 
  
  
• supplementary material

Theories of vowel inherent spectral change: A review.
Morrison, G.S. (2007). Unpublished manuscript.

Testing theories of vowel inherent spectral change.
Morrison, G.S., & Nearey, T.M. (2007). Journal of the Acoustical Society of America, 122, EL15–EL22.
doi:10.1121/1.2739111

• prepublication version with embedded soundfiles and high-quality graphics

L1-Spanish speakers’ acquisition of the English /i/–/I/ contrast II: Perception of vowel inherent spectral change.
Morrison, G.S. (2009). Language & Speech, 52, 437–462.
doi:10.1177/0023830909336583

• 
  
  
• supplementary material

Perception of synthetic vowels by monolingual Canadian-English, Mexican-Spanish, and Peninsular-Spanish listeners.
Morrison, G.S. (2008). Canadian Acoustics, 36(4), 17–23.

L1-Spanish speakers’ acquisition of the English /i/–/I/ contrast: Duration-based perception is not the initial developmental stage.
Morrison, G.S. (2008). Language & Speech, 51, 285–315.
doi:10.1177/0023830908099067

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• supplementary material

Complexity of acoustic-production-based models of speech perception.
Morrison, G.S. (2008). Proceedings of Acoustics’08, (pp. 2369–2374). Paris: Société Française d’Acoustique.

A cross-dialect comparison of Peninsula- and Peruvian-Spanish vowels.
Morrison, G.S., & Escudero, P. (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.

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. 

[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.

A revolution in forensic voice comparison / Una revolución en la comparación forense del habla.
Morrison, G.S. (2010, November). 2nd Pan-American/Iberian Meeting on Acoustics Lay Language Papers, Acoustical Society of America World Wide Press Room.

Sounds & Signals: Improving forensic voice comparison. (Poscast report based on an interview with Dr. Geoffrey Stewart Morrison).
Bard, S. (2009, June 19). Science Update. Washington, DC: American Association for the Advancement of Science.

Report begins at time stamp 9:17

Forensic voice comparison – Reality not TV.
Morrison, G.S. (2009, May). 157th Meeting Lay Language Papers, Acoustical Society of America World Wide Press Room.

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

Abridged Curriculum Vitae

CSIC/UIMP, La evaluación de las evidencias y la comparación forense del habla, mayo 2012

UNSW, ELEC9781 Forensic Voice Comparison and Evaluation of Evidence, August–October 2011

University of Alberta, LING 205 Practical Phonetics, Spring 2006