Headshot of Sheena Josselyn.

Sheena Josselyn

Senior scientist, Hospital for Sick Children;
Contributing editor, The Transmitter

Sheena Josselyn is senior scientist at the Hospital for Sick Children (SickKids) and professor of psychology and physiology at the University of Toronto in Canada. She holds a Canada research chair in brain mechanisms underlying memory, and she is a fellow of the Royal Society of Canada and of the U.S. National Academy of Medicine.

Josselyn is interested in understanding how the brain encodes, stores and uses information. Her primary model organism is mice. Because several conditions (ranging from autism to Alzheimer’s disease) may stem from disrupted information processing, this basic knowledge in mice is critical not only for understanding typical human brain function, but for developing new treatment strategies for these conditions.

She received her undergraduate degrees in psychology and life sciences and an M.Sc. in clinical psychology from Queen’s University in Kingston, Canada. She received a Ph.D. in neuroscience/psychology from the University of Toronto, with Franco Vaccarino as her supervisor. She conducted postdoctoral work with Mike Davis of Yale University and Alcino Silva of the University of California, Los Angeles.

Josselyn has received numerous awards, including the Innovations in Psychopharmacology Award from the Canadian College of Neuropsychopharmacology, the Effron Award from the American College of Neuropsychopharmacology, the Andrew Carnegie Prize in Mind and Brain Sciences, and the Betty & David Koetser Award for Brain Research.

Explore more from The Transmitter

Genetic profiles separate early, late autism diagnoses

Age at diagnosis reflects underlying differences in common genetic variants and developmental trajectories among people with autism.

By Natalia Mesa
27 November 2025 | 5 min read

To persist, memories surf molecular waves from thalamus to cortex

During the later stages of learning, the mouse brain progressively activates transcriptional regulators that drive memory consolidation.

By Claudia López Lloreda
26 November 2025 | 4 min read

Sex hormone boosts female rats’ sensitivity to unexpected rewards

During the high-estradiol stages of their estrus cycle, female rats learn faster than they do during other stages—and than male rats overall—thanks to a boost in their dopaminergic response to reward, a new study suggests.

By Angie Voyles Askham
26 November 2025 | 5 min read

privacy consent banner

Privacy Preference

We use cookies to provide you with the best online experience. By clicking “Accept All,” you help us understand how our site is used and enhance its performance. You can change your choice at any time. To learn more, please visit our Privacy Policy.