Várunk minden érdeklődőt a PPKE-ITK soronkövetkező előadására!

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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