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Időpont: Kedd, ápr. 26. 16h
Helyszín: Pázmány P. Kat. Egyetem - ITK (1083, Práter utca 50/a) Kari Tanácsterem (204-es
szoba)
Prof. David Melcher, PhD
associate professor
Center for Mind/Brain Sciences (CIMeC)
University of Trento
Italy
http://www.unitn.it/en/cimec/11705/david-melcher
Visual stability across saccadic eye movements
When looking around a scene, people typically make 2 - 3 rapid, ballistic eye movements
("saccades") in order to bring their gaze to bear on objects of interest. A
basic question in visual neuroscience is how information is combined across separate
glances into a stable, continuous percept. Previous explanations have included theories
such as integration in a trans-saccadic buffer or storage in short-term visual memory, or,
on the contrary, the idea that perception begins anew with each fixation. Converging
evidence from primate neurophysiology, human psychophysics and neuroimaging suggest a new
explanation for smooth and stable perception. We argue that the intention to make a
saccadic eye movement initiates a series of preparations in the brain that lead to a
fundamental alteration in visual processing before, during and after the saccadic eye
movement. The goal of these transformations is to yield continuous perception of coherent
events that span across the saccade. This theory of “trans-saccadic
perception” may help to explain how it is possible—despite discrete
sensory input and limited memory—that conscious perception across saccades
appears stable, predictable and continuous.
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