The Two Stream Model . Two neural pathways involved in human vision Dorsal pathway is thought to be involved in motion perception, depth perception, and spatial vision. Ventral pathway is thought to be involved in form perception, color, and high acuity.
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Picture taken from: http://www.ssc.education.ed.ac.uk/courses/pictures/vnov07iv0.jpg
The Dorsal Stream
The Ventral Stream
Picture taken from: http://thebrain.mcgill.ca/flash/a/a_02/a_02_cr/a_02_cr_vis/a_02_cr_vis.html
Picture from: “X and Y Cells in the Lateral Geniculate Nucleus of Macaque Monkeys” by E. Kaplan and R.M. Shapely
Example of second order motion: http://www.youtube.com/watch?v=tGJYSIBETho