John Reynolds

Visual Salience, Competition, Neuronal Response Synchrony and Selective Attention

Salk Institute

Visual perception seems effortless, but psychophysical experiments show that the brain is severely limited in the amount of visual information it can process at any moment in time. For instance, when people are asked to identify the objects in a briefly presented scene, they become less accurate as the number of objects increases. The inability to process more than a few objects at a time reflects the limited capacity of some stage (or stages) of sensory processing, decision-making, or behavioral control. Somewhere between stimulating the retina and generating a behavioral response, objects compete with one another to pass through this computational bottleneck. What are the neural mechanisms underlying this competition? How are they influenced by intrinsic properties of the stimulus, such as its visual salience? How does visual attention modulate this competition to select out behaviorally relevant stimuli while suppressing irrelevant distractors? I will describe a series of single-unit recording experiments we have conducted to address these questions. The results of these experiments clarify the role of attention in modulating visual signals, and provide a set of constraints that rule out many possible models of extrastriate visual processing. I present a simple cortical circuit that satisfies these constraints and suggests a computational role for recently observed changes in neuronal synchronization with attention.

Monday, June 5, 2023
About the Swartz Foundation...
 
The Swartz Foundation was established by Jerry Swartz (bio) in 1994 . . .
more>
 
Follow us...
 
The Swartz Foundation is on Twitter: SwartzCompNeuro
more>
 
 
2013 Stony Brook Mind/Brain Lecture - Michael Wigler, PhD
 
 
2012 Stony Brook Mind/Brain Lecture - John Donoghue
 
 
Sloan-Swartz Centers Annual Meeting 2011
 
 
2011 Stony Brook Mind/Brain Lecture - Allison J. Doupe
 
 
2011 Banbury Workshop
 
 
Sloan-Swartz Centers Annual Meeting 2010
 
 
2010 Stony Brook Mind/Brain Lecture
 
 
Sloan-Swartz Centers Annual Meeting 2009
 
 
Conference on Neural Dynamics
 
 
2009 Stony Brook Mind/Brain Lecture
 
 
Canonical Neural Computation, April 2009
 
 
2009 Banbury Workshop
 
 
Sloan-Swartz Centers Annual Meeting 2008
 
 
Theoretical and Experimental Approaches to Auditory and Visual Attention - Banbury 2008
 
 
Stony Brook Mind/Brain 2008: Patricia Smith Churchland, B. Phil. D
 
 
Sloan-Swartz Centers Annual Meeting 2007
 
 
New Frontiers In Studies Of Nonconscious Processing - Banbury 2007
 
 
Stony Brook Mind/Brain 2007: Professor Michael Shadlen, MD, PhD
 
 
Multi-level Brain Modeling Workshop 2006
 
 
Sloan Swartz Centers Annual Meeting 2006
 
 
Banbury 2006: Computational Approaches to Cortical Functions
 
 
Stony Brook Mind/Brain 2006: Helen Fisher -- Lecture Videos
 
 
Sloan-Swartz Centers for Theoretical Neurobiology
 
 
Swartz Center for Computational Neuroscience
 
 
Banbury Center Workshop Series
 
 
Other Events
 
www.theswartzfoundation.org                           Copyright © The Swartz Foundation 2023