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The Representation of Visual Salience in the Superior Colliculus

The Representation of Visual Salience in the Superior Colliculus. Brian White Centre for Neuroscience Studies Queen’s, Kingston, Ontario, Canada. June 9 th , 2012. Frontal Parietal. SCs. Brainstem. Thalamus. SCi. Oculomotor Circuit. Occipital. Retina.

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The Representation of Visual Salience in the Superior Colliculus

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  1. The Representation of Visual Saliencein the Superior Colliculus Brian White Centre for Neuroscience Studies Queen’s, Kingston, Ontario, Canada June 9th, 2012

  2. Frontal Parietal SCs Brainstem Thalamus SCi Oculomotor Circuit Occipital Retina SCs = Superior Colliculus Superficial Layers SCi= Superior Colliculus Intermediate Layers

  3. Aim • Directly test whether the SC shows evidence of a sensory-driven saliency map • i.e., higher-order visual process associated with computation of visual salience • which takes into account feature-specific spatial interactions between stimuli across the entire visual field

  4. Experiment 1 • We compared visually evoked SC activation across three task irrelevant stimulus conditions • singleitem, popout, conjunction • Monkey’s task was to saccade to goal-related stimulus that ran orthogonal to the RF, where the salient item appeared

  5. Task

  6. (i) Single item cond (ii) Popout cond (iii) Conjunction cond

  7. (i) Single item cond (ii) Popoutcond (iii) Conjunction cond

  8. (i) Single item cond (ii) Popout cond (iii) Conjunctioncond

  9. Saccade Abrupt onset

  10. Saccade Abrupt onset single item in RF +

  11. Saccade Abrupt onset single item in RF +

  12. Saccade Abrupt onset single item at anti- location +

  13. Saccade Abrupt onset popout stimulus in RF +

  14. Saccade Abrupt onset popout stimulus at anti- location +

  15. Saccade Abrupt onset conjunction condition +

  16. SC Depth 0-1mm (SCs) N=14 * * 1-3mm (SCi) N=9 Popout in RF Popout anti-location Conjunction Single item in RF Single item anti-location

  17. Local field potentials (LFP) Single item in RF Single item anti-loc Popout item in RF Popout item anti-loc Conjunction SCs SCi

  18. Experiment 2 • Same as Exp 1 except the RF was dragged over salient item via a pursuit eye movement. • Same three conditions • singleitem, popout, conjunction

  19. Pursuit

  20. Single item in RF N=19 SCs neurons

  21. Single item in RF N=19 SCs neurons

  22. Single item at anti location N=19 SCs neurons

  23. Popout stimulus in RF N=19 SCs neurons

  24. Popout stimulus at anti location N=19 SCs neurons

  25. Conjunctioncondition N=19 SCs neurons

  26. N=14 SCi neurons

  27. Summary • SC neurons (and LFPs) showed greater visual activation for popout relative to conjunction and anti-popoutconditions, even though the stimuli were task irrelevant. • This difference emerged after the initial visual transient. A similar pattern was observed previously inV4(Burrows & Moore, 2009), andLIP(Arcizet, Mirpour & Bisley 2011). • This difference was greatest for neurons within the dorsal most 1mm of the SC surface (i.e., the superficial visual layers) • where the predominant inputs arise from visual cortex, not parietal/frontal cortices.

  28. SCs Frontal Parietal Brainstem Thalamus SCi Oculomotor Circuit Occipital SCs = Superior Colliculus Superficial Layers SCi= Superior Colliculus Intermediate Layers

  29. Frontal Parietal Brainstem Thalamus Oculomotor Circuit saliency SCs SCi Occipital SCs = Superior Colliculus Superficial Layers SCi= Superior Colliculus Intermediate Layers

  30. Frontal Parietal Brainstem Thalamus Oculomotor Circuit saliency SCs SCi Occipital SCs = Superior Colliculus Superficial Layers SCi= Superior Colliculus Intermediate Layers

  31. Munoz Lab Doug Munoz Takuro Ikeda Collaborators: Laurent Itti David Berg Technical: Ann Lablans, Lindsey Duck, Donald Brien, Sean Hickman, Mike Lewis. Funding:CIHR, DARPA

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