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Perception & Attention. Computational Cognitive Neuroscience Randall O’Reilly. Perception Overview. Optic Pathway. Retinal Contrast Filtering. V1. Visual Hierarchy: What vs Where. Hierarchy of Detectors. Self-Organization of V1 Orientation Selective Neurons. Topography!.

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perception attention

Perception & Attention

Computational Cognitive Neuroscience

Randall O’Reilly

topography
Topography!

Map of orientations

“Pinwheel” singularities

Hypercolumn organization

invariant object recognition1
Invariant Object Recognition
  • Hierarchy of increasing:
    • Feature complexity
    • Spatial invariance
  • Strong match to RF’s in corresponding brain areas

(Neocognitron, HMAX, SLF, Pinto/DiCarlo, etc.)

slide18

3D Object Recognition Test

  • 3D models from Google SketchUp
  • 100 categories
  • 9-10 objects per category
  • 2 objects left out for testing
  • +/- 20° horiz depth rotation + 180° flip
  • 0-30° vertical depth rotation
  • 14° 2D planar rotations
  • 25% scaling
  • 30% planar translations

http://grey.colorado.edu/CompCogNeuro/index.php/CU3D