How Reaction Time Is Measured
Reaction time is typically assessed using simple or choice paradigms. In a simple reaction time task, a single stimulus requires a single response - such as pressing a button when a light appears. Choice reaction time involves selecting among multiple responses based on different stimuli. Laboratory measurements use millisecond-precision timers, while online tests account for input device latency.
Factors That Influence Reaction Time
Several variables affect reaction time, including age, fatigue, arousal level, stimulus intensity, and practice. Young adults typically exhibit simple reaction times between 150-300 ms. Sleep deprivation, alcohol, and certain medications slow responses, while caffeine and regular training can improve them. The dominant hand generally responds 5-10 ms faster than the non-dominant hand.
Practical Applications
Reaction time benchmarks are used in sports science to evaluate athlete readiness, in clinical settings to detect neurological impairment, and in human factors research to design safer interfaces. Esports players often train specifically to reduce reaction latency, with elite competitors achieving consistent times below 180 ms in controlled conditions.