Reaction time is the amount of time that elapses between a stimulus and the response to that stimulus. It is an important measure of cognitive function and can be affected by a variety of factors, including age, fatigue, and stress.
There are a number of ways to check reaction time. One common method is to use a simple reaction time test, which involves pressing a button as quickly as possible after a light or sound is presented. More complex reaction time tests can measure the time it takes to respond to a specific stimulus, such as a particular word or image.