Reaction time refers to the amount of time it takes for someone to respond to a stimulus or a situation. It measures how quickly a person can react to something happening around them. Full definition
Adults with autism have slower reaction times compared with controls, measured by how fast they can click a computer mouse in response to seeing a button light up. (scientificamerican.com)
The typical reaction time of a driver is about 1.5 seconds. (wannadrive.com)
This includes a fun and quick practical activity for measuring reaction times in students. (tes.com)