| Reaction time distributions constrain models of visual search. | |
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MedLine Citation:
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PMID: 19895828 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Many experiments have investigated visual search for simple stimuli like colored bars or alphanumeric characters. When eye movements are not a limiting factor, these tasks tend to produce roughly linear functions relating reaction time (RT) to the number of items in the display (set size). The slopes of the RTxset size functions for different searches fall on a continuum from highly efficient (slopes near zero) to inefficient (slopes>25-30ms/item). Many theories of search can produce the correct pattern of mean RTs. Producing the correct RT distributions is more difficult. In order to guide future modeling, we have collected a very large data set (about 112,000 trials) on three tasks: an efficient color feature search, an inefficient search for a 2 among 5s, and an intermediate colorxorientation conjunction search. The RT distributions have interesting properties. For example, target absent distributions overlap target present more than would be expected if the decision to end search were based on a simple elapsed time threshold. Other qualitative properties of the RT distributions falsify some classes of model. For example, normalized RT distributions do not change shape as set size changes as a standard self-terminating model predicts that they should. |
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Authors:
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Jeremy M Wolfe; Evan M Palmer; Todd S Horowitz |
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Publication Detail:
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Type: Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't Date: 2009-11-04 |
Journal Detail:
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Title: Vision research Volume: 50 ISSN: 1878-5646 ISO Abbreviation: Vision Res. Publication Date: 2010 Jun |
Date Detail:
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Created Date: 2010-06-23 Completed Date: 2011-06-03 Revised Date: 2011-08-01 |
Medline Journal Info:
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Nlm Unique ID: 0417402 Medline TA: Vision Res Country: England |
Other Details:
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Languages: eng Pagination: 1304-11 Citation Subset: IM |
Copyright Information:
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Copyright 2009 Elsevier Ltd. All rights reserved. |
Affiliation:
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Visual Attention Laboratory, Brigham and Women's Hospital and Harvard Medical School, 64 Sidney Street, Suite 170, Cambridge, MA 02139-4170, United States. wolfe@search.bwh.harvard.edu |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adolescent Adult Female Humans Male Middle Aged Models, Theoretical Photic Stimulation Reaction Time / physiology* Task Performance and Analysis Visual Perception / physiology* Young Adult |
| Grant Support | |
ID/Acronym/Agency:
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EY016632/EY/NEI NIH HHS; MH056020/MH/NIMH NIH HHS; R01 EY005087-20/EY/NEI NIH HHS; R01 MH056020-09/MH/NIMH NIH HHS |
| Comments/Corrections | |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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