Runway speed was investigated in 3 groups of water-deprived rats (n = 14 per group) given one trial per day for 100 days. No statistically significant differences were found between Ss continuously receiving 0.8 cc (large reward group) or 0.1 cc (small reward group) of water and those given 0.8 cc and 0.1 cc (varied reward group) semirandomly. These data are not consistent with a position derived from a micromolar theory holding that continuous reinforcement training results in better performance than varied reinforcement training.
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