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A host of factors potentially can affect operator reliance on automation. Some previously studied factors include automation reliability, types of errors, and training. The current study explores another influence on operator reliance—time pressure. Participants performed a simulated target-detection task aided by diagnostic automation that varied in reliability. The amount of time given to operators to make a decision was manipulated to test how time pressure affected operator reliance. The data revealed that when under time pressure, participants tended to depend more on the automation, as seen by increased compliance to the aid's recommendations. This increased compliance benefited overall human-automation performance when the aid was highly reliable but adversely affected overall performance when the aid was less reliable. The data suggest a potential method for mitigating automation under-reliance …