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Seminar✓ Recording AvailableNeuroscience

How do we find what we are looking for? The Guided Search 6.0 model

Jeremy Wolfe

Prof

Harvard

Schedule
Tuesday, October 26, 2021

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Schedule

Tuesday, October 26, 2021

6:00 PM Asia/Tel_Aviv

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Host: BIU Vision Science

Watch the seminar

Recording provided by the organiser.

Event Information

Domain

Neuroscience

Original Event

View source

Host

BIU Vision Science

Duration

70 minutes

Abstract

The talk will give a tour of Guided Search 6.0 (GS6), the latest evolution of the Guided Search model of visual search. Part 1 describes The Mechanics of Search. Because we cannot recognize more than a few items at a time, selective attention is used to prioritize items for processing. Selective attention to an item allows its features to be bound together into a representation that can be matched to a target template in memory or rejected as a distractor. The binding and recognition of an attended object is modeled as a diffusion process taking > 150 msec/item. Since selection occurs more frequently than that, it follows that multiple items are undergoing recognition at the same time, though asynchronously, making GS6 a hybrid serial and parallel model. If a target is not found, search terminates when an accumulating quitting signal reaches a threshold. Part 2 elaborates on the five sources of Guidance that are combined into a spatial “priority map” to guide the deployment of attention (hence “guided search”). These are (1) top-down and (2) bottom-up feature guidance, (3) prior history (e.g. priming), (4) reward, and (5) scene syntax and semantics. Finally, in Part 3, we will consider the internal representation of what we are searching for; what is often called “the search template”. That search template is really two templates: a guiding template (probably in working memory) and a target template (in long term memory). Put these pieces together and you have GS6.

Topics

Guided Search 60attentionbehaviourbottom-up guidancecognitiondiffusion processperceptionprimingselective attentionspatial priority maptarget templatetop-down guidancevisionvisual search

About the Speaker

Jeremy Wolfe

Prof

Harvard

Contact & Resources

Personal Website

search.bwh.harvard.edu

@jeremymwolfe

Follow on Twitter/X

twitter.com/jeremymwolfe

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