Exercise and Cognition ---------------------- This study uses Mechanical Turk to determine whether people expect exercise interventions to improve performance on cognitive tasks. Subjects read about an exercise plan and then learn about cognitive tasks. For each task, they judge whether the exercise plan would lead to improvements. The study is designed as a check for differential placebo effects—do people expect more improvement from one intervention than another. If they do, and expectations are consistent with published results, then differential improvements following exercise might just result from differential expectations. Prior to registration, we conducted two pilot studies to make sure the question wording was clear and to develop attention check questions. Following those pilot studies, we developed a complete protocol and plan for the main study listed in the project. The protocol appears under the Wiki for the Main study and also as a pdf file under the Files for the main study. We registered the study prior to data collection for the main study.