Willey (1981) found six PP unit sites in 649 electrode penetrations done on 84 different animals' protocerebrums. In each of the six penetration sites, several different PP units could be isolated with the pulse-height discriminator window. All discriminated PP units exhibited random steady-state ring with the animal in the horizontal plane (^ = 0°). Willey averaged the number of window-discriminated spikes in six 3-s intervals to obtain the primary orientation background level (POBL) of a unit in pps. Curiously, PP units exhibited suppression of the POBL (background) ring if tilted in certain ranges of ., generally about 180° away from the . giving the maximum response of the unit. This behavior is illustrated in Figure 2.6-6.
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