The Simon Effect is a psychological phenomenon where a person's reaction time is influenced by the spatial relationship between a stimulus and a response. When a stimulus appears on one side of the body, responses are typically faster if the corresponding action is also on that side, even if the location is irrelevant to the task. This effect highlights how our cognitive processes are affected by spatial cues. Researchers often study the Simon Effect to understand how attention and perception interact. It demonstrates that our brains are wired to respond more efficiently when stimuli and responses align spatially, revealing insights into human cognition and decision-making processes.