Abstract
4 groups of male albino rats were given 45 double runway trials under the following conditions: (a) nonreward in goal box (GB1) throughout, (b) nonreward in GB1 for 30 trials followed by an upshift to two 97-mg. sucrose pellets for 15 trials, (c) two 97-mg. sucrose pellets in GB1 throughout, or (d) two 97-mg. sucrose pellets for 30 trials followed by a GB1 downshift to nonreward for 15 trials. Sucrose incentive upshift produced a rapid runway one start speed increment, while the downshift in sucrose had little or no effect on this measure. Runway one run and goal measures and all measures of runway two performance seemed little affected by GB1 incentive magnitude, in that all groups converged toward a common asymptote.
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