Prof. Zivotofsky's Lab
Head - Ocular Motor and Visual Perception Laboratory Lab
Prof. Ari Zivotofsky is a Senior Lecturer in Bar-Ilan's Interdisciplinary Science Program. He completed his undergraduate degree in electrical engineering and his Ph.D. in biomedical engineering.
Following a post-doctorate at the prestigious National Institute of Health, Zivotofsky moved to Israel in 2000 and joined the fledgling brain science program.
Zivotofsky and his team apply engineering principles to biological questions, primarily in the field of vision and ocular motility.
Most people do not realize that their eyes make all sorts of movements many times a minute, and that there are numerous brain areas devoted to programming these movements. Usually it is only when a person cannot execute a desired movement, or is plagued by unwanted movements, that they give it any thought. In Zivotofsky's lab, the team studies how various movements are planned and carried out in healthy individuals and what can go wrong in various diseases. This latter component is carried out in a lab at Meir Hospital.
Together with a neurologist and a physicist, the team uses the only human magnetic search coil in the country to precisely record and study the eye movements of patients with a variety of diseases including Parkinson's, stiff person syndrome, and Machado-Joseph disease.
Cognitive Science: Perception, Cognitive Function, Laterality, Ethics, and More
While ocular motility was the starting point, research in the lab has branched out to several related fields.
Mostly in collaboration with a French group, Zivotofsky and his team have been studying the effects of a Hebrew's right-to-left orientation on other tasks. Together with an Israeli start-up they have been using the latest tools to study cognitive functioning in a variety of circumstances.
Access to schizophrenic patients has been provided via collaboration with Beer Yaakov mental facility and has enabled several studies pertaining to visual perception in schizophrenic individuals.
The study of vision and eye movements has led the lab to related fields. For example, a casual observer may fail to notice that a pair of walkers strolling together will often synchronize their gait.
This previously unnoticed phenomenon was first reported by Zivotofsky’s lab in collaboration with a gait lab in Tel Aviv University. They initially hypothesized that visual feedback plays a role in the synchronization process, but ongoing research in their lab and in several other labs have found no evidence of this. Nor have they been able to explain what mechanism is used.
This line have research may have important clinical implications because some patients, such as those suffering from Parkinson’s disease, often have disrupted and arrhythmic gait and yet with the aid of external cues (visual, auditory, or proprioceptive), they can synchronize their gait pattern to the external source and enhance the rhythmicity of their gait.
Understanding how healthy walkers unintentionally synchronize may aid in designing rehabilitation protocols for patients; this is an ongoing project in the lab.
In addition, the study of medical ethics, both in general and from a Jewish perspective, is a relatively new area of interest in the lab. Zivotofsky and his group are exploring issues related to abortion, beginning of life, end of life, medical education, and the care of terrorists.
Looking to the Future
The goal of the lab is to continue expanding in all directions, with the hope of furthering the basic understanding of how the visual and ocular motor systems interact.
This may lead to the development of diagnostic tools for some of the conditions studied, such as Machado-Joseph disease.
In addition, the lab is pursuing several new areas of research. In one project, related to depth perception and disparity, researchers in the lab plan to study the properties of the upper disparity limit. A second project relates to the ability of the saccadic system to learn simple repeating patterns and make predictive saccades at very short latencies.