Spatial ensemble statistics are efficient codes that can be represented with reduced attention
Open Access
- 5 May 2009
- journal article
- research article
- Published by Proceedings of the National Academy of Sciences in Proceedings of the National Academy of Sciences
- Vol. 106 (18), 7345-7350
- https://doi.org/10.1073/pnas.0808981106
Abstract
There is a great deal of structural regularity in the natural environment, and such regularities confer an opportunity to form compressed, efficient representations. Although this concept has been extensively studied within the domain of low-level sensory coding, there has been limited focus on efficient coding in the field of visual attention. Here we show that spatial patterns of orientation information (“spatial ensemble statistics”) can be efficiently encoded under conditions of reduced attention. In our task, observers monitored for changes to the spatial pattern of background elements while they were attentively tracking moving objects in the foreground. By using stimuli that enable us to dissociate changes in local structure from changes in the ensemble structure, we found that observers were more sensitive to changes to the background that altered the ensemble structure than to changes that did not alter the ensemble structure. We propose that reducing attention to the background increases the amount of noise in local feature representations, but that spatial ensemble statistics capitalize on structural regularities to overcome this noise by pooling across local measurements, gaining precision in the representation of the ensemble.Keywords
This publication has 80 references indexed in Scilit:
- The Representation of Simple Ensemble Visual Features Outside the Focus of AttentionPsychological Science, 2008
- Local luminance and contrast in natural imagesVision Research, 2006
- Spectral statistics in natural scenes predict hue, saturation, and brightnessProceedings of the National Academy of Sciences of the United States of America, 2006
- Statistics of natural image categoriesNetwork: Computation in Neural Systems, 2003
- Perception without attention: Evidence of grouping under conditions of inattention.Journal of Experimental Psychology: Human Perception and Performance, 1997
- Perception without attention: Evidence of grouping under conditions of inattention.Journal of Experimental Psychology: Human Perception and Performance, 1997
- Enhanced Perception of Illusory Contours in the Lower Versus Upper Visual HemifieldsScience, 1996
- Using confidence intervals in within-subject designsPsychonomic Bulletin & Review, 1994
- Primacy of wholistic processing and global/local paradigm: A critical review.Psychological Bulletin, 1992
- The role of categorization in visual search for orientation.Journal of Experimental Psychology: Human Perception and Performance, 1992