The tiger on your tail: choosing between temporally extended behaviors.

The time spent choosing between temporally extended behaviors cannot, in general, last as long as the behaviors themselves; otherwise, the tiger on your tail would have you for lunch. Previous reaction time studies provide little information on this topic, which was explored in the study reported here by showing participants images of scenes for which they could choose a left or right walking-and-reaching path. The paths they chose were nearly identical to ones chosen by participants who actually performed the task in a previous study. Moreover, the times participants took to choose the actions were about 5 times shorter than the times it took to perform them. The choice-time data were inconsistent with the idea that participants picked the path with a lower cost after mentally simulating the paths one after the other. Showing real-world scenes and having participants choose actions for them holds promise for future research in cognitive psychology, ecological psychology, and behavioral ecology.