What will Phil do next?

Past research has shown that perceivers intentionally may make trait inferences about others and use this information to make predictions about these others' future behaviors. Other research has also shown that people can make trait inferences without intent-that is, spontaneously. However, one unexplored avenue is whether spontaneous trait inferences (STI), affect how perceivers predict others' will behavior. Three studies explored this issue. Results from Studies 1 and 2 showed that: (1) exposure to trait-implicative behaviors describing an actor influences subsequent behavior predictions made about the actor in a trait-consistent manner, and (2) predictions occurred regardless of behavior recall, implying that the behavior predictions were derived from prior trait inferences and not from behavior recall. Results from Study 3 bolstered this conclusion by showing that behavior predictions were similar regardless of whether subjects were explicitly instructed to make inferences or not, but that a manipulation known to interfere with inference generation (lie detection instructions) muted behavior predictions. Results from Study 3 also suggested that the prediction effects had both automatic and controlled components, and that reductions observed in the lie detection condition of Study 3 were caused by alterations in the automatic influence of trait knowledge to the behavior predictions. These results suggest that STI may be causal inferences about the actors' dispositions.