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Recent researches have hypothesized that Externals should perceive a communicator relatively low in prestige as an unlikely source of reinforcement and should, therefore, be more readily persuaded by a source high in prestige. Internals, because they believe themselves to be more in control of potentially reinforcing events, should be influenced equally and to a lesser extent by both high and low prestige communicators. A more recent experiment has been reported in which the researchers tested the hypothesis that Externals would conform significantly more than Internals to both high and low influence messages. Influence was defined in terms of how strongly a subject was urged to agree with a message about grading procedures. The Externals reacted as predicted, moving in a conforming direction after exposure to either level of influence. Internals, on the other hand, manifested reactance to the high influence message and were unmoved by the low influence message. Source credibility was not manipulated in this experiment, so that the results offer only indirect confirmation of the relationships reported.