Direction selectivity and orientation selectivity were examined in the direction-selective (DS) and @entity4536 ( @entity4536 ) ganglion cells in the @entity95 retina. Spike activities were recorded in vivo using @entity5335 -in-glass electrodes. Three types of visual stimuli ( @entity11170 slit, moving edges behind a slit, and whole-field drifting gratings) were used to distinguish these attributes. Fourier analysis was performed on data obtained using drifting gratings as proposed by Worgotter and Eysel (1987). Results from both angular and Fourier (polar angle frequency) domains were consistent. DS cells had strong directional components and varying strength of orientational components; they also had intact inhibitory surrounds. The phase of the biased orientation did not have a consistent relationship with the preferred direction. @entity4536 cells had predominant orientational components and very weak directional components. We conclude that the orientation bias does not contribute to the generation of direction selectivity, and that the mechanism of this bias of DS cells is rather different from the mechanism that generates orientation selectivity in @entity95 @entity4536 cells. There are indications that it is similar to the mechanism shown to cause orientation bias in cat concentric cells.

Distinguishing direction selectivity from orientation selectivity in the XXXX retina.

@entity5335 :: ('MESH:D014414', 'Chemical') :: ['tungsten'] @entity4536 :: ('MESH:D016773', 'Disease') :: ['OS', 'orientation-selective'] @entity95 :: ('9986', 'Species') :: ['rabbit'] @entity11170 :: ('MESH:D019584', 'Disease') :: ['flashing']
@entity95 :: (9986,Species) :: ['rabbit']
