Psychomotor speed refers to the speed at which a person can process information and respond with physical actions. It involves the coordination of mental processes and physical movements, such as reaction time, hand-eye coordination, and the speed of information processing.

Psychomotor speed is an important aspect of cognitive function and can be affected by various factors, such as age, health, and lifestyle. For example, as we age, our psychomotor speed may decline, but regular exercise and a healthy diet may help to maintain or improve it.

Psychomotor speed is often assessed through standardized tests that measure reaction time, speed of movement, and other physical and cognitive factors. These tests can be used to evaluate a person's overall cognitive function, as well as to diagnose specific disorders, such as attention deficit hyperactivity disorder (ADHD) or Parkinson's disease.