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Tzvi Ganel

PhD, Head of the laboratory for Visual Perception and Action

Office: Building 98, Room 205

Research Interests

Visual control of action constitutes a fundamental ability that allows people and other organisms to interact with their visual environments. Visual perception of objects, on the other hand, allows people to identify objects in their visual environment. Current models of visual perception propose that those two visual functions are neuroanatomically dissociable. My main areas of research include studying visual perception in general, and more specifically, exploring the potential differences between visual perception and visually-guided action using behavioral methods as well as using fMRI.

An ongoing research in my perception-action lab is being focused on how visual perception and visually-guided action differ from one another using established psychophysical and behavioral tools such as testing those two systems under different contexts that emphasize configural processing, numerical magnitude, and visual illusions.  A central research direction in my lab is related to the question of whether action and perception differ from one another in how they relate to basic psychophysical principals.  A relevant example is that of Weber's law, a fundamental perceptual principle according to which visual resolution linearly increases with stimuli size. We recently showed, using classic behavioral methods, is that while resolution for stimulus size behaves according to Weber's when visual perception is involved, Weber's law does not characterize the control of visually-guided action in a task in which participants were asked to grasp various objects that differed in length (Ganel, Chajut, & Algom, 2008, Current Biology). 

Recent selected publication

Freud, E., Ganel, T., & Avidan, G. (2012). Representation of possible and impossible objects in the human visual cortex: evidence from fMRI adaptation. NeuroImage. doi:10.1016/j.neuroimage.2012.08.070

Ben-Shalom, A. & Ganel, T. (2012). Object representations in visual memory: Evidence from visual illusions. Journal of Vision, 12.

Hadad, B. S., Avidan, G., & Ganel, T. (2012). Functional dissociation between perception and action is evident early in life. Developmental Science, 15, 653-658.

Milner, A. D., Ganel, T., & Goodale, M. A. (2012). Does grasping in patient D.F. depend on vision? Trends in Cognitive Sciences, 16, 256-257.

Ganel, T., Freud, E., Chajut, E., & Algom, D. (2012). Accurate visuomotor control below the perceptual threshold of size discrimination. PLoS ONE, 7, e36253.

Ganel, T. (2011). Revisiting the relationship between the processing of gaze direction and the processing of facial expression. Journal of Experimental Psychology: Human Perception and Performance, 37, 48-57.

Ganel, T., Chajut, E., & Algom, D. (2008). Visual coding for action violates fundamental psychophysical principles. Current Biology, 18, R599-601.

Ganel, T., Tanzer, M., & Goodale, M. A. (2008). A double dissociation between action and perception in the context of visual illusions: Opposite effects of real and illusory size. Psychological Science, 19, 221-225.

Tzvilab tzvilab,
Oct 16, 2012, 6:00 AM