Mackay, Michael and Cerf, Moran and Koch, Christof (2012) Evidence for two distinct mechanisms directing gaze in natural scenes. Journal of Vision, 12 (4). p. 9. ISSN 1534-7362 http://resolver.caltech.edu/CaltechAUTHORS:20120605-104655889
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Various models have been proposed to explain the interplay between bottom-up and top-down mechanisms in driving saccades rapidly to one or a few isolated targets. We investigate this relationship using eye-tracking data from subjects viewing natural scenes to test attentional allocation to high-level objects within a mathematical decision-making framework. We show the existence of two distinct types of bottom-up saliency to objects within a visual scene, which disappear within a few fixations, and modification of this saliency by top-down influences. Our analysis reveals a subpopulation of early saccades, which are capable of accurately fixating salient targets after prior fixation within the same image. These data can be described quantitatively in terms of bottom-up saliency, including an explicit face channel, weighted by top-down influences, determining the mean rate of rise of a decision-making model to a threshold that triggers a saccade. These results are compatible with a rapid subcortical pathway generating accurate saccades to salient targets after analysis by cortical mechanisms.
|Additional Information:||© 2012 Association for Research in Vision and Ophthalmology. Received March 9, 2011; published April 17, 2012. This work was funded by the Mathers Foundation, ONR, DARPA, and NSF. Author contributions: Co-authors Moran Cerf and Michael Mackay contributed equally to this work. Commercial relationships: none.|
|Subject Keywords:||eye-tracking; natural scenes; saliency; saccadic latency; drift diffusion model|
|Official Citation:||Mackay, M., Cerf, M., & Koch, C. (2012). Evidence for two distinct mechanisms directing gaze in natural scenes. Journal of Vision, 12(4):9, 1–12, http://www.journalofvision.org/content/12/4/9, doi:10.1167/12.4.9.|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Jason Perez|
|Deposited On:||05 Jun 2012 20:45|
|Last Modified:||05 Jun 2012 20:45|
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