Ehud Zohary

Professor

The Swiss Friends Vision Laboratory

Linking Perception, Memory and Action

Welcome to Ehud Zohary’s Lab. Our research is focused on how our brain generates a representation of the world around us, combining incoming perceptual information with memory-based expectations (of what it should be), to act on it. Consider the demo you’ve just seen,  showing a visual scene, typical scanning patterns, and the image generated on your retina. The visual image is heavily blurred in the periphery. We therefore constantly scan the visual scene with our eyes. thereby generating a novel retinal image with every new eye movement. Incredibly, our brain seamlessly generates a stable representation of the visual scene in spite of this jerky and incomplete visual information. This perceptual stability is so robust that we live in an illusion that we see everything at the highest precision all at once. In our labraory  we conduct experiment trying to gain further understanding of the phenomenon.

We are also interested in understanding changes in cortical representations. For example: how do the blind construct a world image? What happens to their “visual” cortex? How does our brain generate a body image? how does it change following amputation? Learn more about this and other projects.

 

What do we study? (one example)

The visual image is heavily blurred in the periphery (the fovea, a region with highest visual acuity, is limited to the central ~2 degrees of the visual field). One of our means to compensate for this limitation is to constantly scan the visual scene, making about 3 saccades in a second, thereby generating a novel retinal image is changing with every new eye movement. Incredibly, our brain seamlessly generates a stable representation of the visual scene in spite of this jerky and incomplete visual information. This perceptual stability is so robust that we live in an illusion that we see everything at the highest precision all at once.

How does our brain perform this?

 

ZW-1ZW-2

 

More projects:

- Eye opener project: Vision following late emergence from congenital blindness - click here for the project's website

- Visual perception, memory & eye movements

- Action observation

 

We are always looking for bright and motivated students, who have keen interest in Systems Neuroscience. Computational/analytical background is a major advantage. Please email Ehud Zohary if you qualify.

We thank the following agencies and private foundations for their generous support in the past & present: Israel-US Binational foundation (BSF);  Israel Science Foundation, The McDonell Foundation, The Dana  Foundation, & Israel National Institute for Psychobiology.

Recent publications

2018

2017

2016

Contact information

Phone: +972-2-6586737
Fax: +972-2-6584985
Lab Phone: 972-2-6585152

Department of Neurobiology
Alexander Silberman Institute of Life Sciences
Hebrew University of Jerusalem
Edmond J. Safra Campus
Jerusalem 9190401
Israel 

Websites