The Dynamics of Perceptual Decision Making

Rahnev, Dobromir

Title:

The Dynamics of Perceptual Decision Making

dc.contributor.author	Rahnev, Dobromir
dc.contributor.corporatename	Georgia Institute of Technology. Neural Engineering Center	en_US
dc.contributor.corporatename	Georgia Institute of Technology. School of Psychology	en_US
dc.date.accessioned	2017-03-02T17:22:05Z
dc.date.available	2017-03-02T17:22:05Z
dc.date.issued	2017-02-13
dc.description	Presented on February 13, 2017 at 11:00 a.m. in the Engineered Biosystems Building (EBB), Room 1005	en_US
dc.description	Dobromir Rahnev is an Assistant Professor of Psychology at Georgia Tech. His research attempts to elucidate the brain mechanisms that influence what we perceive, as well as build computational models that explain current findings and lead to novel testable predictions.	en_US
dc.description	Runtime: 52:34 minutes	en_US
dc.description.abstract	How do humans and other animals make decisions? A large body of work has investigated this question in the perceptual domain where subjects make decisions about simple visual stimuli. A critical question concerns the “dynamics” of these decisions: how do they evolve over time and how do top-down processes influence them? In the first part of the talk, I’ll present evidence for the existence of a hierarchy of top-down control processes. These processes influence the selection, decision, and evaluation of visual stimuli and originate from progressively rostral areas within the human lateral frontal cortex. In the second part of the talk, I’ll describe recent work into the computations underlying perceptual decisions. I’ll argue that, contrary to popular theories such as drift diffusion and probabilistic population codes, perceptual decisions are based neither on point estimates nor on full probability distributions. Instead, they are likely based on hybrid representations that include a point estimate supplanted by strength of evidence for that estimate. Finally, I’ll discuss the implications of this coding scheme for human optimality.	en_US
dc.format.extent	52:34 minutes
dc.identifier.uri	http://hdl.handle.net/1853/56478
dc.language.iso	en_US	en_US
dc.relation.ispartofseries	GT Neuro Seminar Series
dc.subject	Decision making	en_US
dc.subject	Frontal cortex	en_US
dc.subject	Perception	en_US
dc.title	The Dynamics of Perceptual Decision Making	en_US
dc.type	Moving Image
dc.type.genre	Lecture
dspace.entity.type	Publication
local.contributor.author	Rahnev, Dobromir
local.contributor.corporatename	Neural Engineering Center
local.relation.ispartofseries	GT Neuro Seminar Series
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