Center for Perceptual Systems

Randy L Diehl

ProfessorPh.D., University of Minnesota

Professor, Dean of Liberal Arts
Randy L Diehl



Diehl's research focuses on the perception and production of speech sounds and on auditory category learning. Various methods are used including: acoustic analysis of natural speech, perceptual identification and discrimination of synthetic speech stimuli and of analogous non-speech stimuli, computational modeling of the representation of speech sounds in the auditory nerve and estimation of auditory distances among sounds, simulations of preferred speech sound inventories using a criterion of maximal auditory distance. We are currently applying Bayesian statistical decision theory in the analysis of tasks that involve learning of novel auditory categories (including both non-speech categories and second language sound categories) as well as tasks that involve recognition of sounds from one's first language.


Kingston J., Diehl R.L., Kirk C. & Castleman W. (2008, September) On the internal perceptual structure of distinctive features: The [voice] contrast. Journal of Phonetics, 36, 28-54.

Diehl R., Lott A. & Holt L. (2004, September) Speech Perception. Annual Review of Psychology, 55, 149-179.

Diehl, R. & Lindblom, B. (2004) Explaining the structure of feature and phoneme inventories. In S. Greenberg, W. Ainsworth, A. Popper & R. Fay (Eds.), Speech Processing in the Auditory System (pp.101-162). New York: Springer-Verlag.

Wong P. & Diehl, R.L.  (2003, September) Perceptual normalization for inter- and intra-talker variation in Cantonese. Journal of Speech, Language, and Hearing Research, 46, 413-421.

Geisler W.S. & Diehl R.L. (2003, September) A Bayesian approach to the evolution of perceptual and cognitive systems. Cognitive Science, 118, 1-24.

Papanicolaou A., Castillo E., Breier J., Davis R., Simos & Diehl R.L. (2003, September) Differential brain activation patterns during perception of voice and tone onset time series: A MEG study. Neuroimage, 18, 448-459.

Diehl R., Lindblom B. & Creeger C. (2003) Increasing realism of auditory representations yields further insights into vowel phonetics. Causal Publications Adelaide, Vol. 2, pp. 1381-1384.

Maddox W.T., Molis M. & Diehl R. (2002, September) Generalizing a neuropsychological model of visual categorization to auditory categorization of vowels. Perception & Psychophysics, 64, 584-597.

Geisler W.S. & Diehl, R.L. (2002, September) Bayesian natural selection and the evolution of perceptual systems. Philosophical Transactions of the Royal Society of London: Biological Science, 357, 419-448.

Wong P. & Diehl, R.L. (2002, September) How can the lyrics of a song in a tone language be understood. Psychology of Music, 30, 202-209.

Diehl, R., Molis, M. & Castleman, W. (2001) Adaptive design of sound systems: Some auditory considerations. In K. Johnson & E. Hume (Eds.), The Role of Perceptual Phenomena in Phonological Theory (pp.123-139). San Diego: Academic Press.

Maddox W.T.,  Molis M. & Diehl R.L. (2001) Generalizing a neuropsychological model of visual categorization to auditory categorization of vowels. Proceedings of the Workshop on Speech Recognition as pattern Classification, Nijmegen, 85-90.

Breier J., Gray L., Fletcher J., Diehl R., Klaas P., Foorman B. & Molis M. (2001, September) Perception of voice and tone onset time continua in children with dyslexia with and without attention deficit/hyperactivity disorder. Journal of Experimental Child Psychology, 80, 245-270.

Diehl, R. (2000, September) Searching for an auditory description of vowel categories. Phonetica, 57, 267-274.

Redford M. & Diehl R.L. (1999, September) The relative perceptual distinctiveness of initial and final consonants in CVC syllables. Journal of the Acoustical Society of America, 106, 1555-1565.

Hay J. & Diehl R.L. (1999) Effect of duration, intensity, and F0 alternations on rhythmic grouping. Proceedings of the International Congress of Phonetic Sciences, San Francisco, pp. 245-248.

Diehl, R. (1998, September) Locus equations: A partial solution to the problem of consonant place perception. Behavioral and Brain Sciences, 21, 264.

Simos P., Diehl R.L., Breier J., Molis M., Zouridakis G. & Papanicolaou A. (1998, September) MEG correlates of categorical perception of a voice onset time continuum in humans. Cognitive Brain Research, 7, 215-219.

Molis M., Diehl R.L. & Jacks A. (1998) Phonological boundaries and the spectral center of gravity. Proceedings of the 16th International Congress on Acoustics and the 135th Meeting of the Acoustical Society of America, 2019-2020.

Wong P. & Diehl R.L. (1998) Effect of spectral distance on vowel perception. Proceedings of the 16th International Congress on Acoustics and the 135th Meeting of the Acoustical Society of America, 2015-2016.

Diehl R.L., Lindblom B., Hoemeke K. & Fahey R. (1996, September) On explaining certain male-female differences in the phonetic realization of vowel categories. Journal of Phonetics, 24, 187-208.

Fahey R., Diehl R.L. & Traunmuller, H. (1996, September) Perception of back vowels: Effects of varying F1-F0 distance. Journal of the Acoustical Society of America, 99, 2350-2357.

Fahey R. & Diehl R.L. (1996, September) The missing fundamental in vowel height perception. Perception & Psychophysics, 58, 725-733.

Castleman W. & Diehl R.L.  (1996, September) Effects of fundamental frequency on medial and final [voice] judgments. Journal of Phonetics, 24, 383-398.

Diehl R.L. & Castleman W. (1996) Integrated perceptual properties: The affricate/fricative distinction. In A.P. Simpson & M. Pätzold (eds.), Sound Patterns of Connected Speech: Proceedings of the Symposium Held at Kiel University on 14-15 June 1996 (pp. 191-200). Institut für Phonetik und digitale Sprachverarbeitung, Universität Kiel, Arbeitsberichte #31.

Diehl, R. & Molis, M. (1995, September) Effects of fundamental frequency on medial [voice] judgments. Phonetica, 52, 188-195.

Kingston J. & Diehl R.L. (1995) Intermediate properties in the perception of distinctive feature values. In B. Connell & A. Arvaniti (Eds.), Phonology and phonetics: Papers in laboratory phonology IV (pp.7-27). Cambridge: Cambridge University Press.

Balise R. & Diehl R.L.  (1994, September) Some distributional facts about fricatives and a perceptual explanation. Phonetica, 51, 99-110.

Kingston J. & Diehl R.L. (1994, September) Phonetic knowledge. Language, 70, 419-454.

Diehl R. & Hoemeke K. (1994, September) Perception of vowel height: The role of F1-F0 distance. Journal of the Acoustical Society of America, 96, 661-674.

Cohen L., Diehl R.L., Oakes L. & Loehlin J. (1992, September) Infant perception of /aba/ versus /apa/: Building a quantitative model of infant categorical discrimination. Developmental Psychology, 28, 261-272.

Hura S. & Lindblom B. & Diehl, R.L. (1992, September) On the role of perception in shaping phonological assimilation rules. Language and Speech, 35, 59-72.

Hura S. & Lindblom B. & Diehl R.L. (1992) Some evidence that perceptual factors shape assimilations. Chalmers Technical Report 10, Göteborg, Sweden: Chalmers University of Technology, Department of Information Theory.

Cohen L.B., Diehl R.L., Oakes L.M., & Loehlin J.C. (1992). Infant perception of /aba/ versus /apa/: Building a quantitative model of infant categorical discrimination. Developmental Psychology, 28, 261-272.

Diehl R., Kluender K., Walsh M. & Parker E. (1991) Auditory enhancement in speech perception and phonology. In R. Hoffman & D. Palermo (Eds.), Cognition and the symbolic processes, Vol 3: Applied and ecological perspectives (pp.59-76). Hillsdale, NJ: Erlbaum.

Diehl R.L., Walsh M. & Kluender K. (1991, September) On the interpretability of speech/nonspeech comparisons: A reply to Fowler. Journal of the Acoustical Society of America 89, 2905-2909.

Walsh M. & Diehl R.L. (1991, September) Formant transition duration and amplitude rise time as cues to the stop/glide distinction. Quarterly Journal of Experimental Psychology, 43A, 603-620.

Diehl, R. (1991) Listener-oriented constraints on articulatory organization. Proceedings of the XIIth International Congress of Phonetic Sciences Aix-en-Provence, France, August 19-24, 1991. Vol. 1, 92-96. (Invited semi-plenary paper).

Diehl, R. (1991, September) The role of phonetics in the study of language. Phonetica, 48, 120-134.

Diehl, R.L., & Kingston, J. (1991). Phonetic covariation as auditory enhancement: The case of the [+ voice]/[- voice] distinction. PERILUS: Papers from the Conference on Current Phonetic Research Paradigms: Implications for Speech Motor Control, Stockholm University, August 13-16, 1991.

Blicher D., Diehl R.L. & Cohen L. (1990, September) Effects of syllable duration on the perception of the Mandarin Tone 2/Tone 3 distinction: Evidence of auditory enhancement. Journal of Phonetics, 18, 1-13.

Diehl R., Kluender K. & Walsh M. (1990) Some auditory bases of speech perception and production. In W. Ainsworth (Ed.), Advances in speech, hearing and language processing (pp.243-268). London: JAI Press.

Diehl R.L. & Kluende, K. (1989, September) On the objects of speech perception. Ecological Psychology, 1, 121-144.

Diehl, R. & Kluender, K. (1989, September) Reply to commentators. Ecological Psychology 1, 195-225.

Diehl, R. (1989, September) Remarks on Stevens' quantal theory of speech. Journal of Phonetics 17, 71-78.

Diehl R.L. & Walsh M. (1989, September) An auditory basis for the stimulus-length effect in the perception of stops and glides. Journal of the Acoustical Society of America, 85, 2154-2164.

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