Discriminated lever-press avoidance learning as a function of type and intensity of shock.

Abstract
In a discriminated lever-press avoidance situation with rats as Ss [subjects] US [unconditional stimulus] intensity was manipulated for both continuous and discontinuous (.2 sec. on time, 2.0 sec. off time) shock. For all shock levels (.2, .55, and 2.75 ma.) avoidance learning was superior with the discontinuous shock; and with both types of US avoidance conditioning was inversely related to shock intensity.