June 2006
Volume 6, Issue 6
Free
Vision Sciences Society Annual Meeting Abstract  |   June 2006
Characterizing surprise in humans and monkeys
Author Affiliations
  • David J. Berg
    Neuroscience Graduate Program, University of Southern California, Los Angeles, California 90089-2520, USA
  • Susan Boehnke
    Centre for Neuroscience Studies and Department of Physiology, Queen's University, Kingston, ON K7L 3N6, Canada
  • Robert Marino
    Centre for Neuroscience Studies and Department of Physiology, Queen's University, Kingston, ON K7L 3N6, Canada
  • Pierre Baldi
    Department of Computer Science, University of California, Irvine, Irvine, California 92697-3425, USA
  • Doug Munoz
    Centre for Neuroscience Studies and Department of Physiology, Queen's University, Kingston, ON K7L 3N6, Canada
  • Laurent Itti
    Departments of Computer Science, Psychology and Neuroscience Graduate Program, University of Southern California, Los Angeles, California 90089-2520, USA
Journal of Vision June 2006, Vol.6, 211. doi:10.1167/6.6.211
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      David J. Berg, Susan Boehnke, Robert Marino, Pierre Baldi, Doug Munoz, Laurent Itti; Characterizing surprise in humans and monkeys. Journal of Vision 2006;6(6):211. doi: 10.1167/6.6.211.

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Abstract

We investigate the role of visual surprise in guiding eye movements in humans and rhesus monkeys under free viewing conditions, for a variety of natural stimuli. Surprise differs from other models of bottom-up visual attention in that it quantifies how data affects an observer, by measuring the difference between posterior and prior beliefs of the observer. We recorded eye movements from naive observers, 4 humans and 3 monkeys, while they watched 115 video clips (47,903 frames, 27 minutes) resulting in 6,775 saccades for humans and 10,406 for monkeys. Clips ranged in semantic content, including video of natural, non-natural, building-city, indoor, and sporting-outdoor scenes both with and without main actors. A surprise model of bottom-up visual attention then predicted in real-time how surprising every location was in the display. The distribution of surprise at the endpoint (target) locations of human or monkey saccadic eye movements was then compared to the distribution of surprise at random locations using a standard information theoretic technique, Kullback-Leibler distance. Considering all clips together 59% and 56% of gaze shifts were directed towards locations more surprising than average for humans and monkeys, however, agreement with the model varied greatly across clip type (ranging from 35–77%). Humans and monkeys showed a similar pattern of agreement with the model across image type, with a significant difference only in sporting-outdoor clips. This data suggests that under free viewing humans and monkeys are employing similar bottom-up attentional mechanisms.

Berg, D. J. Boehnke, S. Marino, R. Baldi, P. Munoz, D. Itti, L. (2006). Characterizing surprise in humans and monkeys [Abstract]. Journal of Vision, 6(6):211, 211a, http://journalofvision.org/6/6/211/, doi:10.1167/6.6.211. [CrossRef]
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