Now showing items 1-20 of 23

    • 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 compensatory dynamic of inter-hemispheric interactions in visuospatial attention revealed using rTMS and fMRI 

      Plow, Ela B.; Cattaneo, Zaira; Carlson, Thomas A.; Alvarez, George A.; Pascual-Leone, Alvaro; Battelli, Lorella (Frontiers Media S.A., 2014)
      A balance of mutual tonic inhibition between bi-hemispheric posterior parietal cortices is believed to play an important role in bilateral visual attention. However, experimental support for this notion has been mainly ...
    • Conceptual distinctiveness supports detailed visual long-term memory for real-world objects 

      Konkle, Talia A; Brady, Timothy F; Alvarez, George Angelo (American Psychological Association, 2010)
      Humans have a massive capacity to store detailed information in visual long-term memory. The present studies explored the fidelity of these visual long-term memory representations and examined how conceptual and perceptual ...
    • Detecting changes in real-world objects: The relationship between visual long-term memory and change blindness 

      Brady, Timothy F.; Konkle, Talia; Oliva, Aude; Alvarez, George Angelo (Landes Bioscience, 2009)
      A large body of literature has shown that observers often fail to notice significant changes in visual scenes, even when these changes happen right in front of their eyes. For instance, people often fail to notice if their ...
    • Explaining human multiple object tracking as resource-constrained approximate inference in a dynamic probabilistic model 

      Vul, Edward; Frank, Michael C.; Tenenbaum, Joshua B.; Alvarez, George Angelo (Massachusetts Institute of Technology Press, 2009)
      Multiple object tracking is a task commonly used to investigate the architecture of human visual attention. Human participants show a distinctive pattern of suc- cesses and failures in tracking experiments that is often ...
    • Failure of Working Memory Training to Enhance Cognition or Intelligence 

      Thompson, Todd W.; Waskom, Michael L.; Garel, Keri-Lee Alyson; Cardenas-Iniguez, Carlos; Reynolds, Gretchen O.; Winter, Rebecca; Chang, Patricia; Pollard, Kiersten; Lala, Nupur; Alvarez, George Angelo; Gabrieli, John D.E. (Public Library of Science, 2013)
      Fluid intelligence is important for successful functioning in the modern world, but much evidence suggests that fluid intelligence is largely immutable after childhood. Recently, however, researchers have reported gains ...
    • High-level neural structures constrain visual behavior 

      Cohen, Michael A (2014-06-06)
      Visual cognition is notoriously limited: only a finite amount of information can be fully processed at a given instant. What is the source of these limitations? Here, we suggest that the organization of higher-level visual ...
    • Measuring, monitoring, and maintaining memories in a partially observable mind 

      Suchow, Jordan William (2014-06-06)
      Visual memory holds in mind details of objects, textures, faces, and scenes. After initial exposure to an image, however, visual memories rapidly degrade because they are transferred from iconic memory, a high-capacity ...
    • Mid-level perceptual features distinguish objects of different real-world sizes. 

      Long, Bria Lorelle; Konkle, Talia A; Cohen, Michael A.; Alvarez, George Angelo (American Psychological Association (APA), 2016)
      Understanding how perceptual and conceptual representations are connected is a fundamental goal of cognitive science. Here, we focus on a broad conceptual distinction that constrains how we interact with objects—real-world ...
    • Modeling Visual Working Memory with the MemToolbox 

      Suchow, Jordan William; Brady, Timothy Francis; Fougnie, Daryl; Alvarez, George Angelo (Association for Research in Vision and Ophthalmology (ARVO), 2013)
      The MemToolbox is a collection of MATLAB functions for modeling visual working memory. In support of its goal to provide a full suite of data analysis tools, the toolbox includes implementations of popular models of visual ...
    • Motion Silences Awareness of Visual Change 

      Suchow, Jordan W.; Alvarez, George Angelo (Elsevier BV, 2011)
      Loud bangs, bright flashes, and intense shocks capture attention, but other changes—even those of similar magnitude—can go unnoticed. Demonstrations of change blindness have shown that observers fail to detect substantial ...
    • Number estimation relies on a set of segmented objects 

      Franconeri, Steven L.; Bemis, Douglas K.; Alvarez, George Angelo (Elsevier BV, 2009)
      How do we estimate the number of objects in a set? Two types of visual representations might underlie this ability – an unsegmented visual image or a segmented collection of discrete objects. We manipulated whether individual ...
    • The Number of Attentional Foci and Their Precision Are Dissociated in the Posterior Parietal Cortex 

      Shim, W. M.; Alvarez, George Angelo; Vickery, T. J.; Jiang, Y. V. (Oxford University Press (OUP), 2009)
      Many everyday tasks require us to track moving objects with attention. The demand for attention increases both when more targets are tracked and when the targets move faster. These 2 aspects of attention—assigning multiple ...
    • Object-Based Benefits without Object-Based Representations 

      Alvarez, George Angelo; Fougnie, Daryl; Cormiea, Sarah M (Association for Research in Vision and Ophthalmology, 2012)
      The organization of visual information into objects strongly influences visual memory: Displays with objects defined by two features (e.g. color, orientation) are easier to remember than displays with twice as many objects ...
    • Rapid Assimilation of External Objects Into the Body Schema 

      Carlson, T. A.; Alvarez, George Angelo; Wu, D.-a.; Verstraten, F. A. J. (SAGE Publications, 2010)
      When a warrior picks up a sword for battle, do sword and soldier become one? The notion of an extended sense of the body has been the topic of philosophical discussion for more than a century and more recently has been ...
    • Real-World Objects Are Not Represented as Bound Units: Independent Forgetting of Different Object Details from Visual Memory 

      Brady, Timothy Francis; Konkle, Talia A; Alvarez, George Angelo; Oliva, Aude (American Psychological Association, 2013-05-20)
      Are real-world objects represented as bound units? Although a great deal of research has examined binding between the feature dimensions of simple shapes, little work has examined whether the featural properties of real-world ...
    • The Role of the Parietal Lobe in Visual Extinction Studied with Transcranial Magnetic Stimulation 

      Battelli, Lorella; Alvarez, George Angelo; Carlson, Thomas; Pascual-Leone, Alvaro (University of Chicago Press, 2009)
      Interhemispheric competition between homologous areas in the human brain is believed to be involved in a wide variety of human behaviors from motor activity to visual perception and particularly attention. For example, ...
    • Scene Memory Is More Detailed Than You Think: The Role of Categories in Visual Long-Term Memory 

      Konkle, Talia A; Brady, T. F.; Alvarez, George Angelo; Oliva, A. (SAGE Publications, 2010)
      Observers can store thousands of object images in visual long-term memory with high fidelity, but the fidelity of scene representations in long-term memory is not known. Here, we probed scene-representation fidelity by ...
    • Tracking the allocation of attention using human pupillary oscillations 

      Naber, Marnix; Alvarez, George A.; Nakayama, Ken (Frontiers Media S.A., 2013)
      The muscles that control the pupil are richly innervated by the autonomic nervous system. While there are central pathways that drive pupil dilations in relation to arousal, there is no anatomical evidence that cortical ...
    • Variability in the Quality of Visual Working Memory 

      Fougnie, Daryl; Suchow, Jordan W.; Alvarez, George A. (Nature Publishing Group, 2012)
      Working memory is a mental storage system that keeps task-relevant information accessible for a brief span of time, and it is strikingly limited. Its limits differ substantially across people but are assumed to be fixed ...