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Neural transmission latency would introduce a spatial lag when an object moves across the visual field, if the latency was not compensated. A visual predictive mechanism has been proposed, which overcomes such spatial lag by extrapolating the position of the moving object forward. However, a forward position shift is often absent if the object abruptly stops moving (motion-termination). A recent "correction-for-extrapolation" hypothesis suggests that the absence of forward shifts is caused by sensory signals representing 'failed' predictions. Thus far, this hypothesis has been tested only for extra-foveal retinal locations. We tested this hypothesis using two foveal scotomas: scotoma to dim light and scotoma to blue light. We found that the perceived position of a dim dot is extrapolated into the fovea during motion-termination. Next, we compared the perceived position shifts of a blue versus a green moving dot. As predicted the extrapolation at motion-termination was only found with the blue moving dot. The results provide new evidence for the correction-for-extrapolation hypothesis for the region with highest spatial acuity, the fovea.
Pubmed ID: 22438976
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A portal to educate, engage and create an online community. The Fisher Center for Alzheimer''s Research Foundation, founded in 1995, was created in answer to the recommendations of three U.S. Senate commissioned symposia held in the 1990s by the National Institutes of Health (NIH) to gather information on the cause, care and cure of Alzheimer''s disease. The Fisher Center was created following this design. The funding initiatives of the Foundation are appropriated accordingly to the three areas cited by the NIH task force cause, care and cure. The primary resources of the Foundation are directed toward scientific research into the cause and hopefully the cure of Alzheimer''s disease. To this end, the Foundation under the direction of its founder, Zachary Fisher, and in collaboration with David Rockefeller, constructed the Fisher Center for Alzheimer''s Disease Research at The Rockefeller University, headed by 2000 Nobel Prize winner, Paul Greengard, Ph.D. The 10,000 square foot laboratory is the most advanced facility of its kind in the country equipped with the latest in equipment necessary to undertake an interdisciplinary assault on this disease. The Fisher Center also has collaborative programs at the University of Genoa and supports the work of well over 60 scientists and researchers across the United States and in 17 foreign countries. The Foundation also funds projects for the care of people with Alzheimer''s disease and their caregivers. The Fisher Alzheimer''s Disease Education and Resources Program at the New York University School of Medicine was established under the direction of Barry Reisberg, M.D., internationally known expert in the care of Alzheimer''s patients. The Foundations Alzheimer''s Information Program was created in 2001 to answer the primary need of caregivers for comprehensive, easily accessible information. Our goals are to: Understand the Cause of Alzheimer''s To find a Cure for this devastating disease Improve the Care of people living with the disease to enhance their quality of life and that of their caregivers and families About Our Research Beating Back Beta Amyloid Improving the Quality of Life for Alzheimers Patients Reversing Nerve Cell Damage Using Hormones to Slow the Progress of Disease Curing Early-Onset Alzheimers The Science of Caregiving Scientific Studies
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