Overall, we found evidence for personality as a reliable predictor of driving performance among older drivers. However, 2 caveats qualify our conclusions: the research considered only a limited number of personality variables and largely consisted of less valid tests of driving performance. Therefore, to truly understand the relationship between personality and driving performance, future research must consider a wider range of individual differences and employ more stringent tests and methodological designs to measure driving performance.

An experiment was conducted testing the hypothesis that sources delivering unexpected communications (long-haired males arguing against marijuana usage and seminarians arguing in its favor) would be more persuasive than communicators of expected messages (promarijuana hippies and antimarijuana seminarians). Greater attitude change for unexpected sources was found only when the message was antimarijuana. Unexpected communicators also were rated as more sincere and honest than expected sources. Possible reasons for the failure of the expectancy effect to hold for promarijuana communications were suggested, and the results were discussed in terms of a variety of social-psychological theories.

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