Browsing by Author "Cavanagh, Patrick"
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Anatomical Constraints on Attention: Hemifield Independence Is a Signature of Multifocal Spatial Selection
Alvarez, George Angelo; Gill, Jonathan; Cavanagh, Patrick (Association for Research in Vision and Ophthalmology, 2012)Previous studies have shown independent attentional selection of targets in the left and right visual hemifields during attentional tracking (Alvarez & Cavanagh, 2005) but not during a visual search (Luck, Hillyard, Mangun, ... -
The Capacity of Visual Short-Term Memory is Set Both by Visual Information Load and by Number of Objects
Alvarez, George; Cavanagh, Patrick (SAGE Publications, 2004-02)Previous research has suggested that visual short-term memory has a fixed capacity of about four objects. However, we found that capacity varied substantially across the five stimulus classes we examined, ranging from 1.6 ... -
Independent Resources for Attentional Tracking in the Left and Right Visual Hemifields
Alvarez, George; Cavanagh, Patrick (SAGE Publications, 2005-08-01)The ability to divide attention enables people to keep track of up to four independently moving objects. We now show that this tracking capacity is independently constrained in the left and right visual fields as if separate ... -
Onset Rivalry: Brief Presentation Isolates an Early Independent Phase of Perceptual Competition
Carter, Olivia; Cavanagh, Patrick (Public Library of Science, 2007)When the left and right eyes are simultaneously presented with different images, observers typically report exclusive awareness of only one image. This phenomenon is termed binocular rivalry, reflecting the fact that the ... -
Onset Rivalry: The Initial Dominance Phase Is Independent Of Ongoing Perceptual Alternations
Stanley, Jody; Forte, Jason D.; Cavanagh, Patrick; Carter, Olivia (Frontiers Research Foundation, 2011)Binocular rivalry has been used to study a wide range of visual processes, from the integration of low-level features to the selection of signals that reach awareness. However, many of these studies do not distinguish ... -
Quadrantic deficit reveals anatomical constraints on selection
Carlson, Thomas A.; Alvarez, George; Cavanagh, Patrick (Proceedings of the National Academy of Sciences, 2007-08-02)Our conscious experience is of a seamless visual world, but many of the cortical areas that underlie our capacity for vision have a fragmented or asymmetrical representation of visual space. In fact, the representation of ... -
Tracking multiple targets with multifocal attention
Cavanagh, Patrick; Alvarez, George (Elsevier BV, 2005-07)Attention allows us to monitor objects or regions of visual space and select information from them for report or storage. Classical theories of attention assumed a single focus of selection but many everyday activities, ... -
Visual Search for Feature and Conjunction Targets with an Attention Deficit
Arguin, Martin; Joanette, Yves; Cavanagh, Patrick (Massachusetts Institute of Technology Press, 1993)Brain-damaged subjects who had previously been identified as suffering from a visual attention deficit for contralesional stimulation were tested on a series of visual search tasks. The experiments examined the hypothesis ... -
Visual short-term memory operates more efficiently on boundary features than on surface features
Alvarez, George; Cavanagh, Patrick (Springer Science and Business Media LLC, 2008-02-01)A change detection task was used to estimate the visual short-term memory storage capacity for either the orientation or the size of objects. On each trial, several objects were briefly presented, followed by a blank inter- ... -
Within-Hemifield Competition in Early Visual Areas Limits the Ability to Track Multiple Objects with Attention
Stormer, Viola S.; Alvarez, George; Cavanagh, Patrick (Society for Neuroscience, 2014-08-27)It is much easier to divide attention across the left and right visual hemifields than within the same visual hemifield. Here we investigate whether this benefit of dividing attention across separate visual fields is evident ...