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Visual Processing. Sensory Neural Systems 5 February 2008 Rachel L. Le ón. Review. Basic eye structure Sensory cells of the eye Retinal processing. http://scienceblogs.com/clock/2006/06/bio101_lecture_6_physiology_re.php.

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visual processing

Visual Processing

Sensory Neural Systems

5 February 2008

Rachel L. León

review
Review
  • Basic eye structure
  • Sensory cells of the eye
  • Retinal processing

http://scienceblogs.com/clock/2006/06/bio101_lecture_6_physiology_re.php

http://www.chemistry.wustl.edu/~edudev/LabTutorials/Vision/images/Rodcell.jpg

http://www.matossianeye.com/art2/ANATONY2.jpg

neural coding in the retina
Neural Coding in the Retina
  • Ganglion cells influenced by many receptors
  • Pattern of illumination that maximally excites ganglion cell is doughnut shaped
    • Center-surround receptive field
    • Lateral inhibition of receptive fields enhances boundaries
  • X, Y, W ganglion cells

http://www.neurobio.arizona.edu/282/Lectures2005/Visual%20pathways/Blk3Lec2.htm

outline
Outline
  • Classical Visual Pathway
    • Organization of optic nerves and tracts
    • Lateral geniculate nuclei
    • Primary visual cortex
  • Other Pathways

http://www.nature.com/nrn/journal/v6/n3/fig_tab/nrn1630_F4.html

optic nerve and tract
Optic Nerve and Tract
  • Temporal retinal fibers maintain ipsilateral position
  • Nasal retinal fibers cross at optic chiasm
  • Optic tract contains all information from contralateral visual field

http://library.thinkquest.org/26313/eye_wo1.jpg

lateral geniculate nucleus
Lateral Geniculate Nucleus
  • LGN receives most input from optic tracts
  • 6 layer structure
  • Magnocellular layers
  • Parvocellular layers

http://www.physics.utoledo.edu/~lsa/_color/17_eye.htm

gross dissection human visual pathway
Gross Dissection – Human Visual Pathway

http://anatomy.uams.edu/AnatomyHTML/atlas_html/eye_38.html

primary visual cortex
Primary Visual Cortex
  • Simple cells vs. Complex cells
  • Cortical orientation columns
  • Ocular dominance columns
  • Blobs – receive parvocellular input

http://www.neurobio.arizona.edu/282/Lectures2005/Visual%20pathways/10_022.jpg

other visual pathways
Other Visual Pathways
  • Most of the axons not going to LGN terminate in superior colliculus
    • Some efferents from SC go to pulvinar
    • Pulvinar efferents terminate in visual cortex other than V1
  • Some optic tract axons terminate in pretectal area
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