Stefan M. Brudzynski

Biological Sciences

Stefan M. Brudzynski

Office: MC B335
Phone: (905)688-5550 ext.4653


Neural control of animal vocalization and communication
- ultrasonic vocalization
- vocal communication
- vocal expression of emotionality
Neural control of locomotor activity
- mechanisms of movement initiation
- patterns of locomotor activity

The general objective of my research is to study neural mechanisms of behaviour. I am particularly interested in the neural control of vocalization and locomotion as two major components of overt behaviour. The main questions raised are what brain structures are involved in initiation and regulation of these behavioural patterns and what pathways and neurotransmitters are involved in conveying information and in achieving the integration of behavioural output. The research plans represent a multidisciplinary approach ranging from cellular mechanisms and the anatomical organization of neural brain circuits, to integrative aspects of the neural regulation of vertebrate behaviour. The ongoing research projects involve behavioural tests, bioacoustic analyses, measurements of locomotor activity, neuropharmacological, neurophysiological and histological techniques, and electrophysiological and histochemical methods.



Brudzynski, S.M. (2007). Ultrasonic calls of rats as indicator variables of negative or positive states. Acetylcholine-dopamine interaction and acoustic coding. Behavioral Brain Research, 182(2): 261-273.

Brudzynski, S.M. and Holland, G. (2005). Acoustic characteristics of air puff-induced 22-kHz alarm calls in direct recordings. Neurosci Biobehav Rev, 29: 1169-1180.

Brudzynski, S.M. (2005). Principles of rat communication: Quantitative parameters of ultrasonic calls in rats. Behavior Genetics, 35: 85-92.

Brudzynski, S. M., Pniak, A. Social contacts and production of 50-kHz short ultrasonic calls in adult rats. Journal of Comparative Psychology, 2002, 116: 73-82.

Brudzynski, S.M. Pharmacological and behavioral characteristics of 22 kHz alarm calls in rats. Neurosci Biobehav Rev., 2001, 25: 611-617.

Wintink, A.J., Brudzynski, S.M. The related roles of dopamine and glutamate in the initiation of 50-kHz ultrasonic calls in adult rats. Pharmacol Biochem Behav, 2001, 70: 317-323.

Brudzynski, S.M., Kehoe, P. and Callahan, M. (1999). Sonographic structure of isolation-induced ultrasonic calls of rat pups. Developmental Psychobiology, 34: 195-204.

Brudzynski, S.M. and Barnabi, F. (1996). Contribution of the ascending cholinergic pathways in the production of ultrasonic vocalization in the rat. Behavioural Brain Research, 80: 145-152.

Brudzynski, S.M. and Chiu, E. C. (1995). Behavioural responses of laboratory rats to playback of 22 kHz ultrasonic calls. Physiology & Behavior, 57: 1039-1044.

Brudzynski, S.M. (1994). Ultrasonic vocalization induced by intracerebral carbachol in rats: Localization and a dose-response study. Behavioural Brain Research, 63: 133-143.