What type of brain wave is detected when a person is alert?

When a person is alert, the brain exhibits beta waves, which are characterized by high frequency and low amplitude. These brain waves are typically associated with active, engaged mental states, such as concentration, problem-solving, and active thinking. Beta waves are present when individuals are awake and alert, usually reflecting a state of cognitive engagement or focused attention. This level of brain activity contrasts with other types of brain waves associated with different states of consciousness or mental activity. For instance, alpha waves are present during relaxed, calm states yet can also be observed when the eyes are closed but a person is still awake. Theta waves are associated with light sleep or deep relaxation, while delta waves signify deep sleep. Thus, beta waves are the correct representation of brain activity during alertness and active cognitive processes.