The Simple Reaction Time Task (Deary & Liewald, 2011)
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Reaction times have been studies for over 100 years and a staple of scientific study in psychology. A commonly used procedure is to study reaction time involves measuring simple reaction times to a single stimulus.

The task
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The simple reaction time task (Deary & Liewald, 2011) is a computer-based task implemented in PsychoPy in which participants must respond as quickly as possible in response to a single stimulus.

Extensions
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Deary and Liewald (2011) also developed a choice reaction time task which complicates the simple reaction time task by requiring participants to respond to one of a number of stimuli. See if you can modify this task to allow multiple choice responses to be made to stimuli that can appear in one of multiple locations on screen.

References
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Deary, I. J., Liewald, D., & Nissan, J. (2011). A free, easy-to-use, computer-based simple and four-choice reaction time programme: the Deary-Liewald reaction time task. Behavior research methods, 43(1), 258-268.