Additional Study Information: The purpose of this research study is understand how three human abilities, attention, visual conscious perception, and imagination, interact with each other to create our behavior.The procedures in this study require collecting your performance data (how fast and accurate you are) in responding to visual stimuli presented on the screen and / or auditory stimuli.The time frame for your involvement in the study is one session of approximately one hour.The main reason you might want to participate in this study is to help researchers understand how human cognition works.