1. Ascending Visual Pathway
Geniculostriate pathway
form and detail
Tectopulvinar pathway
motion and location
Both pathways start with the optic nerve leaving the eye
Sensation and Perception -ascendvis.ppt © 2001 Dr. Laura Snodgrass, Ph.D.
© 2001 Dr. Laura Snodgrass, Ph.D.

2. Both Pathways Go To The Optic Chiasm
Nasal
retina
Occipital lobe
Sensation and Perception -ascendvis.ppt © 2001 Dr. Laura Snodgrass, Ph.D.
© 2001 Dr. Laura Snodgrass, Ph.D.

3. Optic Chiasm At the optic chiasm
fibers from the nasal hemiretinas cross to the opposite hemisphere
fibers from the temporal hemiretinas continue to the same hemisphere
Retinotopic mapping
the spatial relationships on the retina are preserved in cortex
Sensation and Perception -ascendvis.ppt © 2001 Dr. Laura Snodgrass, Ph.D.
© 2001 Dr. Laura Snodgrass, Ph.D.

4. Lateral View Of Visual Pathways
Sensation and Perception -ascendvis.ppt © 2001 Dr. Laura Snodgrass, Ph.D.
© 2001 Dr. Laura Snodgrass, Ph.D.

5. Subdivisions Of The Occipital Lobe
Sensation and Perception -ascendvis.ppt © 2001 Dr. Laura Snodgrass, Ph.D.
© 2001 Dr. Laura Snodgrass, Ph.D.

6. Geniculostriate Pathway
Optic chiasm
cross over
LGN
selective attention
Occipital areas
17 - simple cells
18 - complex cells
19 hypercomplex cells
Temporal lobe
object identification
Sensation and Perception -ascendvis.ppt © 2001 Dr. Laura Snodgrass, Ph.D.
© 2001 Dr. Laura Snodgrass, Ph.D.

7. Tectopulvinar pathway
Optic chiasm (cross over)
Superior colliculus
location mapping
Occipital lobe
18 - motion
19 - complex motion
Temporal lobe
combine visual information
Sensation and Perception -ascendvis.ppt © 2001 Dr. Laura Snodgrass, Ph.D.
© 2001 Dr. Laura Snodgrass, Ph.D.

8. Two Ascending Visual Pathways
Sensation and Perception -ascendvis.ppt © 2001 Dr. Laura Snodgrass, Ph.D.
© 2001 Dr. Laura Snodgrass, Ph.D.