CaltechAUTHORS
  A Caltech Library Service

Spacing affects some but not all visual searches: Implications for theories of attention and crowding

Reddy, Lavanya and VanRullen, Rufin (2007) Spacing affects some but not all visual searches: Implications for theories of attention and crowding. Journal of Vision, 7 (2). Art. No. 3. ISSN 1534-7362. http://resolver.caltech.edu/CaltechAUTHORS:REDjov07

[img]
Preview
PDF - Published Version
See Usage Policy.

822Kb

Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:REDjov07

Abstract

We investigated the effect of varying interstimulus spacing on an upright among inverted face search and a red–green among green–red bisected disk search. Both tasks are classic examples of serial search; however, spacing affects them very differently: As spacing increased, face discrimination performance improved significantly, whereas performance on the bisected disks remained poor. (No effect of spacing was observed for either a red among green or an L among + search tasks, two classic examples of parallel search.) In a second experiment, we precued the target location so that attention was no longer a limiting factor: Both serial search tasks were now equally affected by spacing, a result we attribute to a more classical form of crowding. The observed spacing effect in visual search suggests that for certain tasks, serial search may result from local neuronal competition between target and distractors, soliciting attentional resources; in other cases, serial search must occur for another reason, for example, because an item-by-item, attention-mediated recognition must take place. We speculate that this distinction may be based on whether or not there exist neuronal populations tuned to the relevant target–distractor distinction, and we discuss the possible relations between this spacing effect in visual search and other forms of crowding.


Item Type:Article
ORCID:
AuthorORCID
VanRullen, Rufin0000-0002-3611-7716
Additional Information:© 2007 ARVO. Received July 14, 2006; published February 2, 2007. This research was supported by grants from the NSF-sponsored Engineering Research Center at Caltech, the National Institutes of Health, the National Institutes of Mental Health, the Keck Foundation, and the McDonnell Foundation. We thank Heinrich Bülthoff for access to the face database and Christof Koch, Jeremy Wolfe, Patrick Cavanagh, and Leila Reddy for helpful comments on previous versions of the manuscript.
Funders:
Funding AgencyGrant Number
NSFUNSPECIFIED
NIHUNSPECIFIED
National Institute of Mental Health (NIMH)UNSPECIFIED
W. M. Keck FoundationUNSPECIFIED
James S. McDonnell FoundationUNSPECIFIED
Subject Keywords:visual search, serial search, crowding, spacing effects, attention, biased competition, feature integration
Issue or Number:2
Record Number:CaltechAUTHORS:REDjov07
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:REDjov07
Alternative URL:http://dx.doi.org/10.1167/7.2.3
Official Citation:Reddy, L., & VanRullen, R. (2007). Spacing affects some but not all visual searches: Implications for theories of attention and crowding. Journal of Vision, 7(2):3, 1-17, http://journalofvision.org/7/2/3/, doi:10.1167/7.2.3.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:9551
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:04 Feb 2008
Last Modified:14 Aug 2019 16:18

Repository Staff Only: item control page