1 / 9

Visual Processing

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.

brock-hyde
Download Presentation

Visual Processing

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Visual Processing Sensory Neural Systems 5 February 2008 Rachel L. León

  2. 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

  3. 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

  4. 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

  5. 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

  6. 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

  7. Gross Dissection – Human Visual Pathway http://anatomy.uams.edu/AnatomyHTML/atlas_html/eye_38.html

  8. 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

  9. 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

More Related