Speed

Consequences: Desired effects

The heightened activity of the noradrenaline and dopamine neurons generates a euphoric, energetic feeling. Dopamine stimulates the brain’s reward centre, resulting in euphoria.

Noradrenaline makes you feel energetic. It stimulates the part of your nervous system that propels your body into an immediate active state and prepares it for great physical efforts. Your heartbeat, blood pressure and body temperature all increase. Bronchial tubes expand, and muscles tense due to the increased oxygen supply. The pupils of your eyes become enlarged.