Visual processing
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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

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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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