Photo of Craig Leth-Steensen

Craig Leth-Steensen

Associate Professor

Degrees:Ph.D. (McGill)
Phone:613-520-2600 x 2254
Office:A535 Loeb Building


  • 2000- present Assistant Professor at Carleton University
  • 1999-2000 Postdoctoral teaching fellow in the Department of Psychology at Northern Michigan University in Marquette, MI.
  • 1998-1999 Postdoctoral trainee in the Quantitative Methods program of the Department of Psychology at the University of Illinois at Urbana-Champaign

Research Interests

Craig Leth-Steensen is a cognitive psychologist with training in the application of quantitative/statistical techniques to the analysis of psychological data. One main focus of his research is the development of mathematical and computational models (including random walks and neural networks) that can provide theoretical accounts for human cognitive and psychophysical performance (especially with respect to reaction time and reaction time distributions). At present, Craig’s main experimental interests involve the study of comparative judgements of symbolically represented attributes (including numbers), speed –accuracy tradeoffs, and a wide variety of information processing phenomena (see papers listed below). Recently, Craig has also become interested in the cognitive development of very young children and has been performing experimental intervention work related to a very promising, novel early learning program called PlayWisely.


Leth-Steensen, C., & Marley, A. A. J. (2000). A model of response time effects in symbolic comparison. Psychological Review, 107, 62-100.

Leth-Steensen, C., King Elbaz, Z., & Douglas, V. I. (2000). Mean response time, variability, and skew in the responding of ADHD children: A response time distributional approach. Acta Psychologica, 104, 167-190.

Leth-Steensen, C. (2000). Localist modeling in psychology: Ho-hum or hm-m-m?. Behavioral and Brain Sciences, 23, 484-485. [Reply to article by M. Page, Connectionist modelling in psychology: A localist manifesto.]

Penner-Wilger, M. E., Leth-Steensen, C., & Lefevre, J. (2002). Decomposing the problem -size effect: A comparison of response time distributions across cultures. Memory & Cognition, 30, 1160-1167.

Shaki, S., Leth-Steensen, C., & Petrusic, W. M. (2006). Effects of instruction presentation mode in comparative judgements. Memory & Cognition, 34, 196-206.

Petrusic, W. M, Shaki, S., & Leth-Steensen, C. (2008). Remembered instructions with symbolic and perceptual comparisons. Perception & Psychophysics, 70, 179-189.

Carroll, S. R., Petrusic, W. M. , & Leth-Steensen, C. (2009). Anchoring effects in the judgment of confidence: Semantic or numeric priming? Attention, Perception, & Psychophysics, 71, 297-307.

Leth-Steensen, C. (2009). Lengthening fixed preparatory durations within a digit magnitude classification task serves mainly to shift distributions of response times upwards. Acta Psychologica, 130, 72-80.

Faregh, N., & Leth-Steensen, C. (2009). Reflections on the voluntary self-exclusion of gamblers and the law-suits against Ontario Lottery and Gaming Corporation. Journal of Gambling Studies, 25, 131-138.

Samavatyan, H., & Leth-Steensen, C. (2009). The time course of task switching: A speed-accuracy trade-off analysis. Memory & Cognition, 37, 1051-1058.

Schoenherr, J., Leth-Steensen, C., & Petrusic, W. M. (2010). Selective attention and confidence calibration. Attention, Perception, & Psychophysics, 72, 352-368.

Faregh, N., & Leth-Steensen, C. (2011). Profiles of Canadian gamblers young and old: Game preferences and play frequencies. Journal of International Gambling Studies, 11, 23-41.

Bresin, K. Robinson, M. R., Ode, S., & Leth-Steensen, C. (2011). Driven, Distracted, or Both? A performance-based ex-Gaussian analysis of individual differences in anxiety. Journal of Personality, 79, 874- 904.

Chartier, S., Leth-Steensen, C., & Hébert, M-F. (2012). Performing complex associations using a generalized bidirectional associative memory. Journal of Experimental and Theoretical Artificial Intelligence, 24, 23-42.

Shaki, S., Petrusic, W. M., & Leth-Steensen, C. (2012). SNARC effects with numerical and symbolic comparative judgments: Instruction and cultural dependencies. Journal of Experimental Psychology: Human Perception and Performance, 38, 515-530.

Hermann, C. A., Babchishin, K. M., Nunes, K. L., Leth-Steensen, C., & Cortoni, F. (2012). Factor structure of the Bumby RAPE scale: A two-factor model. Criminal Justice and Behavior, 39, 869-886.

Petrusic, W. M., Gallitto, E., & Leth-Steensen, C. (2014). Short-term memory for the comparative instructions in symbolic comparison. Canadian Journal of Experimental Psychology/Revue canadienne de psychologie expérimentale, 68, 242-249.

Leth-Steensen, C., Petrusic, W., & Shaki, S. (2014). Enhancing semantic congruity effects with category contingent comparative judgments. Frontiers in Psychology (published on-line Oct. 22, 2014).

Gallitto, E., & Leth-Steensen, C. (2015). Autistic traits and adult attachment styles. Personality and Individual Differences, 79,63-67.

Leth-Steensen, C., & Citta, R. (2016). Good-bad constraints on a polarity correspondence account for the SNARC and MARC effects. Quarterly Journal of Experimental Psychology, 69, 482-494.

Leth-Steensen, C., & Gallitto, E. (2016). Testing Mediation in SEM: The Effectiveness of the Test of Joint Significance. Educational and Psychological Measurement, 76, 339-351.

Mourad, A, & Leth-Steensen, C. (2016). Spatial Reference Frames and SNARC. Journal of Cognitive Psychology, 29, 113-128.

Moret-Tatay, Carmen; Leth-Steensen, Craig; Irigaray, Tatiana Quarti; Argimon, Irani I. L.; Gamermann, Daniel; et al. (2016). The effect of corrective feedback on performance in basic cognitive tasks: An analysis of RT components. Psychologica Belgica,56, 370-381.