Decision time at a complex task was assessed for internal and external subjects who were previously given an instructional set which offered a reward for successful performance or made no mention of a reward. The results revealed that externals performed as well as internals under reward instructions, but did significantly worse than internals when a reward was not mentioned. These results were interpreted as support for Lefcourt's(1967) suggestion that cue explication is critical for externals but not internals. Implications for further research are discussed.
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