Department of Psychology

Professor Emeritus



Ph. D. 1958:

M. A.  1955:

B. A.  1954:

Department of Psychology, Harvard University

Department of Psychology, University of Toronto

Department of Psychology, University of Toronto

Academic Positions





Professor Emeritus, Smith College

Assistant Professor to Professor, Smith College

Assistant Professor, University of W. Ontario

Assistant Professor, University of Pennsylvania

Visiting Appointments

1994 Aug-Oct

1992 May-July

1989 June

1987 June

1985 April-May

1977 Jan-June

1975 July-Aug




Visiting Scholar, University of British Columbia

Visiting Scientist, CNRS, Marseille

Visiting Scientist, CNRS, Marseille

Visiting Lecturer, University of Padu

Visiting Scientist, University of Stockholm

Visiting Professor, University of Stockholm

Visiting Scientist, Institute of Applied Psychology, Stockholm

Visiting Professor, University of Stockholm

Honorary Research Fellow, Psychophysics Laboratory, Harvard University

Visiting Scientist, Bell Telephone Laboratories, Murray Hill, NJ

Research Funding





Principal Investigator, "Scales of perceived magnitude in individual observers," National Institute of Mental Health

Co-Principal Investigator, "Models of apparent size and distance," National Institute of Child Health and Human Development

Principal Investigator, "Dynamic range and resolving power of sensory systems," National Institute of Neurological and Communicative Disorders and Stroke

Principal Investigator, "Resolving power, dynamic range, and growth rate of subjective magnitude," National Science Foundation


Teghtsoonian, R. (2009). Measuring perceived magnitude: It’s legal but is it lawful? In  Elliott, M. (Ed.), Proceedings of the 25th Annual Meeting of the International Society for Psychophysics (in press). Galway, Ireland: ISP.


Teghtsoonian, M., Teghtsoonian, R., & DeCarlo, L.T. (2008). The influence of trial-to-trial

 recalibration on sequential effects in cross-modality matching. Psychological Research,

72, 115-122.

Teghtsoonian, R., Teghtsoonian, M., & Canévet, G. (2005). Sweep-induced acceleration in loudness change and the “bias for rising intensities”. Perception & Psychophysics, 67, 699-712.

Teghtsoonian, R. (2004). Range effects: How many and how important? In Oliveira, A.M., Teixeira, M., Borges, G.F., & Ferro, M.J. (Eds.), Fechner Day 2004, (190-195).

Teghtsoonian, M. & Teghtsoonian, R. (2003). Putting context effects into context.  In Berglund, B. & Borg, E. (Eds.), Fechner Day 2003, (309-314). Larnaca, Cyprus: International Society for Psychophysics.

Canévet, G., Teghtsoonian, R., & Teghtsoonian, M. (2003). A comparison of loudness change in signals that continuously rise or fall in amplitude. Acta Acustica united with Acustica, 89, 339-345.

Canévet, G., Teghtsoonian, M., & Teghtsoonian, R. (2003). Assimilation and asymmetry of loudness change in magnitude-estimation measurements. Acta Acustica united with Acustica, 89, 530-539.

Teghtsoonian, R. (2001). S. S. Stevens. In Smelser, N.J. & Baltes, P.B. (Eds.), International Encyclopedia of the Social and Behavioral Sciences, 22, 15104-8 Pergamon: Oxford.

Teghtsoonian, R., Teghtsoonian, M , & Canévet, G. (2000). The perception of waning signals: Decruitment in loudness and perceived size. Perception and Psychophysics, 62, 637-646.

 Canévet, G, Scharf, B, Schlauch, R.S., Teghtsoonian, M, & Teghtsoonian, R. (1999). Perception of changes in loudness. Nature, 398, 673-674.

Teghtsoonian, M. & Teghtsoonian, R. (1998). Studying remembered size: Some methodological hazards. In Grondin, S. & Lacouture, Y. (Eds.), Fechner Day 98, (367-372). Quebec City, Canada: International Society for Psychophysics.

Teghtsoonian, R. & Teghtsoonian, M. (1997). Range of acceptable stimulus intensities: An estimator of dynamic range for intensive perceptual continua. Perception and Psychophysics, 59, 721-728.

Teghtsoonian, R., Teghtsoonian, M., & Canévet, G. (1995). Loudness decruitment and sweep time. In Possamaï, C-A. (Ed.), Fechner Day 95 (pp. 309-314). Cassis, France: International Society for Psychophysics

Teghtsoonian, R., Teghtsoonian, M., & Baird, J.C. (1995).  On the nature and meaning of sinuosity in magnitude estimation functions.  Psychological Research, 57, 63-69.

Teghtsoonian, R. (1993).  Sensation strength: Another point of view.  Behavioral & Brain Sciences, 16, 161-162.

Teghtsoonian, R. (1992).  Selecting one attribute for judgment is not an act of stupidity.  Behavioral & Brain Sciences, 15, 580-581.

Teghtsoonian, R. (1992).  In defense of the pineal gland. Behavioral & Brain Sciences, 15, 224-225.

Teghtsoonian, R. (1991).  The career of a methodology. Science, 251, 1258.

Teghtsoonian, R. & Teghtsoonian, M. (1989).  Unified psychophysics: Wouldn't it be loverly ... Behavioral & Brain Sciences, 12, 292.

Teghtsoonian, R. (1989).  The study of individuals in psychophysical measurement.  In G. Ljunggren & S. Dornic (Eds.), Psychophysics in action.  Berlin: Springer Verlag.

Teghtsoonian, R. & Teghtsoonian, M. (1988). What magnitude estimation functions really look like: Catching a snake in the grass.  In Ross, H. K. (Ed.), Fechner Day 1988.  Stirling, Scotland: ISP.

Teghtsoonian, M. & Teghtsoonian, R. (Eds.) (1987).  Fechner Day 87: Proceedings of the third annual meeting of the International Society for Psychophysics. Northampton: ISP.

Hellman, R., Scharf, B., Teghtsoonian, M., & Teghtsoonian, R. (1987).  On the relation between the growth of loudness and the discrimination of intensity for pure tones.  J. Acoust. Soc. Am., 82, 448-453.

Teghtsoonian, R., & Powell, A. E. (1987).  Scientific souvenirs.  Contemporary Psychology, 32, 454-455.

Berglund, B., Berglund, U., & Teghtsoonian, R. (Eds.) (1986). Fechner Day 86: Proceedings of the second annual meeting of the International Society for Psychophysics.  Stockholm: ISP.

Teghtsoonian, R., & Teghtsoonian, M. (1986). Individual difference in the judgment of perceived magnitude.  In B. Berglund et al (Eds.), Fechner Day 86.  Stockholm: ISP.

Teghtsoonian, R., & Teghtsoonian, M. (1986). Scaling loudness over short ranges: A reply to Poulton.  Perception and Psychophysics, 39, 73-75.

R.   Hellman, B. Scharf, M. Teghtsoonian, & R. Teghtsoonian. (1985) Masked loudness functions and their relation to intensity discrimination.  Journal of the Acoustical Society of America, 77, 564.

Teghtsoonian, R., & Teghtsoonian, M. (1984). Testing a perceptual constancy model for odor strength: The effects of sniff pressure and resistance to sniffing.  Perception, 13, 743-752.

Teghtsoonian, M. & Teghtsoonian, R. (1983). Consistency of individual exponents in cross-modal matching.Perception & Psychophysics, 33, 203-214.

Teghtsoonian, R., & Frost, R. 0. (1982). The effects of viewing distance on fear of snakes.  Journal of Behavior Therapy and Experimental Psychiatry, 13, 181-190.

Frost, R. O., & Teghtsoonian, R. (1982). Use of psychophysical scaling procedures in the assessment of phobias: A case example.  Journal of Behavior Therapy and Experimental Psychiatry, 13, 191-193.

Teghtsoonian, R. & Teghtsoonian, M. (1982). The effects of sniff pressure and resistance on perceived effort in sniffing.  Perception & Psychophysics, 31, 324-329.

Teghtsoonian, R. (1981). Logical difficulties in physical correlate theory.  The Behavioral and Brain Sciences, 4, 105-106.

Teghtsoonian, R., Teghtsoonian, M., & Karlsson, J.-G. (1981). The limits of perceived magnitude: Comparison among individuals and among perceptual continua.  Acta Psychologica, 49, 83-94.

Teghtsoonian , R. (1980). Review of K. von Fieandt & I.K. Moustgaard, The perceptual world, and R.B. Welch, Perceptual modificationAmerican Journal of Psychology, 93, 181-183.

Teghtsoonian, M., Teghtsoonian, R., Berglund, B., & Berglund, U. (1979). Comment on "Perceived odor intensity as a function of air flow through the nose." Sensory Processes, 3, 204-206.

Teghtsoonian, R., Teghtsoonian, M., Berglund, B., & Berglund, U. (1978). Invariance of odor strenth with sniff vigor: An olfactory analog to size constancy.  Journal of Experimental Psychology: Human Perception and Performance, 4, 144-152.

Teghtsoonian, R., & Teghtsoonain, M. (1978). Range and regression effects in magnitude scaling.  Perception & Psychophysics, 24, 305-314.

Teghtsoonian, R. (1977). Review of G. A. Gescheider's Psychophysics: Method and theoryAmerican Journal of Psychology, 90, 338-339.

Teghtsoonian, R., Teghtsoonian, M., & Karlsson, J.-G. (1976).The effects of fatigue on the perception of muscular effort.  In G. Borg (Ed.), Physical work and effort.  Oxford: Pergamon Press.

Teghtsoonian, R. (1975). Review of S. S. Stevens, Psychophysics.  American Journal of Psychology, 88, 677-684

Teghtsoonian, R. (1974). On facts and theories in psychophysics: Does Ekman's law exist? In H. R. Moskowitz et al (Eds.), Sensation and measurement: Papers in honor of S. S. Stevens.  Holland: D. Reidel.

Teghtsoonian, R. (1973). Range effects in psychophysical scaling and a revision of Steven's law.  American Journal of Psychology, 86, 3-27.

Teghtsoonian, R., & Teghtsoonian, M. (1972). Further evidence of discontinuities in learning to recognize.  Journal of Verbal Learning and Verbal Behavior, 11, 77-85.

Teghtsoonian, R. (1971). On the exponents in Steven's law and the constant in Ekman's law.  Psychological Review, 78 71-80.

Teghtsoonian, R. & Teghtsoonian, M. (1971). Discontinuities in recognition learning revealed by critical trial analysis.  American Journal of Psychology, 84, 75-84.

Teghtsoonian, R., & Teghtsoonian, M. (1971). The apparent lengths of perimeters and diameters define a ratio smaller than piAmerican Journal of Psychology, 84, 437-438.

Teghtsoonian, M., & Teghtsoonian, R. (1971). How repeatable are Stevens' power law exponents for individual subjects? Perception and Psychophysics, 10, 147-149,

Teghtsoonian, R., & Teghtsoonian, M. (1970). Effects of size and distance on magnitude estimations of apparent size.  American Journal of Psychology, 83, 601-612.

Teghtsoonian, R., & Teghtsoonian, M. (1970). Two varieties of perceived length.  Perception & Psychophysics, 8, 389-392.

Teghtsoonian, R., & Teghtsoonian, M. (1970). Scaling apparent distance in a natural outdoor setting.  Psychonomic Science, 21, 215-216.

Teghtsoonian, M. & Teghtsoonian, R. (1970). The transitory effect of number of alternatives on performance in a recognition task.  Journal of Experimental Psychology, 86, 467-468.

Teghtsoonian, M., & Teghtsoonian, R. (1969). Scaling apparent distance in natural indoor settings.  Psychonomic Science, 16, 281-283.

Teghtsoonian, R. (1965). The influence of number of alternatives on learning and performance in a recognition task.  Canadian Journal of Psychology, 19, 31-41.

Teghtsoonian, M. & Teghtsoonian, R. (1965). Seen and felt length.  Psychonomic Science, 3, 465-466.

Teghtsoonian, R. (1964). One-trial learning directly observed.  Canadian Journal of Psychology, 18, 304-310.

Brush, F.R., Goodrich, K., Teghtsoonian, R., & Eisman, E. (1963). The dependence of learning (habit) in the runway on deprivation under three conditions of sucrose incentive Psychological Reports, 12, 375-384.

Brush, F. R., Goodrich, K., Teghtsoonian, R., & Eisman, E. (1961) Running speed as a function of deprivation condition and concentration of sucrose incentive.  Psychological Reports, 9, 627-634.

Campbell, B.A., Teghtsoonian, R., & Williams, R. A. (1961). Activity, weight loss, and survival time of food-deprived rats as a function of age.  Journal of Comparative and Physiological Psychology, 54, 216-219.

Teghtsoonian, R., & Campbell, B. A. (1960). Random activity of the rat during food deprivation as a function of environmental conditions.  Journal of Comparative and Physiological Psychology, 53, 242-244.

Campbell, B. A., & Teghtsoonian, R. (1958). Electrical and behavioral effects of different types of shock stimuli on the rat.  Journal of Comparative and Physiological Psychology, 51, 185-192.

Teghtsoonian, R., & Shephard, A. H. (1957). Reactive and conditioned inhibition in perceptual-motor performance.  Canadian Journal of Psychology, 11, 201-211.


Robert Teghtsoonian


Curriculum Vitae


Lab Members