Indiana University School of Optometry V648 Neurophysiology of Vision

Introduction to the functional organization of the visual system and the physiological basis of vision. This course treats the visual system as a biological image processor to reveal how the structure and function of the retina and brain determine visual performance and constrain the quality of vision.

bullet Instructor
Professor Larry N. Thibos
Office: Optometry 514 / Phone: 812-855-9842 / E-Mail: thibos@indiana.edu
Faculty Web Page: www.opt.indiana.edu/people/faculty/thibos.htm

bullet Lecture Schedule (Spring Semester 2003)
January 14 to 31: Tu 12:20pm-2:15pm, Th 11:15am-12:05pm, Fr 10:10am-12:05pm
Optometry Room 105

Lecture Textbook Topic
1 1. Vision overview Introduction & outline of course content
2 2. Design of Eyes Overview of visual pathways
3 3. Retinal structure Principles of organization of the visual system
4 4. Image capture Structure/function relationships of retinal neurons
5 5. Photopic pathways Regional specialization, design principles of sensory systems
6 6. Scotopic pathways Speed, sensitivity, reliability, adaptability of retinal neurons
7 7. Mesopic pathways Spatial, temporal, filtering of retinal neural image
8 8. Photoreceptor function Chromatic filtering of retinal neural image
9 9. Retinal organization Retinal sampling, undersampling, aliasing
10 10. Photoreceptor traits Neural & optical limits to visual acuity
11 11. Retinal cell types Optic pathways, central projection of optic axons
12 12. Central projection Topographic distortion of neural image in the brain
13 13. Oculomotor control Neural image processing by lateral geniculate nucleus
14 14. Neural images and visual perception Receptive fields of visual cortical neurons
15 Information processing by visual cortex.


bullet Examination Schedule
Tuesday, February 4, 2003, from 12:20pm to 1:10pm in Optometry Room 105

bullet Grading Policy
Grades will be based upon a written examination at the end of the course. Exam scores will be curved to determine the final grade.

bullet Required Textbook
  • The First Steps in Seeing by Robert W. Rodieck (available at the IMU and other bookstores). Chapters 1-14 are required reading for the course--START READING EARLY!

bullet Supplemental Textbooks
  • Visual Perception: A Clinical Orientation by Steven H. Schwartz (on reserve in Optometry Library). Chapters 3 (review), 7 (background), 11, 12, 13 are relevant to the course.
  • Eye, Brain and Vision by David Hubel (an exceptionally easy read by a Nobel Laureate).

bullet Lecture Slides
Slides used to illustrate lectures will be available for viewing by students in the Optometry Computer Cluster using Microsoft PowerPoint. The downloadable versions of the slides listed below are PDF files and can be read with Adobe Acrobat Reader. (Adobe Acrobat Reader is free software which may be obtained from Adobe's Website.)

bullet Additional Materials Available in Optometry Library (optional)
  • Videotape Eyes by F.S. Werblin describes spatial and temporal processing of visual signals in the retina. A companion text, Synaptic connections, receptive fields, and patterns of activity in the tiger salamander retina, published in Invest. Ophthal. Vis. Sci., v32 (1991) is also available.
  • Videotape by Helga Kolb describes functional organization of the retina.
  • Acuity Perimetry and the Sampling Theory of Visual Resolution by L.N. Thibos, in Optometry & Vision Science (1998) 75:399-406 describes a clinical application of V648 material.

bullet Learning Goals and Objectives
The central question of visual neurophysiology (V648) is articulated most clearly by a quotation from David Hubel's book Eye, Brain and Vision, p 2:
The questions that I will be addressing can be simply stated. When we look at the outside world, the primary event is that light is focused on an array of 125 million receptors in the retina of each eye. The receptors, called rods and cones, are nerve cells specialized to emit electrical signals when light hits them. The task of the rest of the retina and of the brain proper is to make sense of these signals, to extract information that is biologically useful to us. The result is the scene as we perceive it [consciously or sub-consciously], with all its intricacy of form, depth, movement, color, and texture. We want to know how the brain accomplishes this feat.

bullet Teaching Aims
  1. Provide a comprehensive treatment, emphasizing general principles, without exhaustive or encumbering detail.
  2. Be up-to-date, yet encourage an appreciation for the sequence of discoveries which led to the present state of knowledge.
  3. Give an accurate and truthful account without avoiding issues which are controversial or uncertain.
  4. Be scientific, but include clinical examples when appropriate for illustrating general principles.
  5. Strive to impart in the student a "mental model" of how the eye and brain extract biologically useful information from the retinal image. This model will form a basis for thinking about how the normal visual system works and the rationale for clinical diagnostic tests of abnormal visual function.


URL: http://www.opt.indiana.edu/v648/index.htm
Revised: October 22, 2002
IU Optometry home page: http://www.opt.indiana.edu/
Comments: Web Administrator
Page design and coding: Terri Greene
Copyright © 2002, The Trustees of Indiana University