Weber ratios were obtained for visual velocity discrimination under three topographic conditions with the same subjects and psychophysical procedures. The conditions differed regarding the presence of either temporal or spatial cues, these being correlated in magnitude with stimulus velocity. Systematic effects of the cues upon the level of velocity discrimination were noted.
Food pellet reinforcement for rats was made contingent upon the peak force of a bar-pressing response falling within restricted limits. Two such "bands," 5 to 10 grams and 15 to 20 grams, were established, the momentarily correct "band" indicated by one of two exteroceptive stimulus values. Peak force of response tended to conform to the reinforcement requirements, the two stimulus values setting the occasion for differentiated distributions of response force.
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