Here are additional materials that may be useful for understanding our papers on the neural basis of stereopsis. Available items are: visually intuitive presentations of binocular receptive field of a complex cell in the 3D space (X,Y,Z), Mathematica notebooks showing details of derivations and creation of plots presented in the papers, and some slide files for prsentations. I will be adding more as time permits.
(Cover photo for NeuroReport vol. 8, no 3, 1997)
Click the image for the full size version (792x528, 49 kB)
Most neurons in the visual cortex can be activated by stimulation
through either eye. These binocular neurons are thought to serve
as the first stage of processing of stereoscopic depth perception.
Left and right eye receptive fields are illustrated here for a
simple cell in the primary visual cortex of the cat. Each receptive
field is defined in three dimensions, two of space (X, Y) and one
of time (T), as represented by a cube. To the upper-left of each
cube, spatial cross-sections are shown for four different time
values (front to back: T=50, 100, 150, and 200 msec). Each of these
profiles is shown as a density plot, in which green and red indicate
regions that are responsive to a bright bar or a dark bar,
respectively. Brighter regions are more responsive. Integrating
the three-dimensional data sets along the Y axis, which in each
case is parallel to the axis of preferred orientation of the cell,
yields simplified spatiotemporal receptive field profiles, or X-T
plots. The gradual changes in spatial receptive field structure
as a function of time are related to motion selectivity.
Text and figures of the article: Ohzawa et al., NeuroReport 8 (3): R3-R12, 1997.