Motivation enhancement
Increased motivation can be described as an enhancement of ones desire and ability to perform tasks and goals in a productive manner. This leads to higher aptitude regarding time and energy-consuming activities by stimulating the drive to perform tasks and complete goals requiring concentration.
Drug-induced increased motivation is amplified and maintained by the effects of increased focus, stimulation, and euphoria. When these effects occur at the same time, the person performing the activity is able to remain fully immersed in a feeling of energized focus, full involvement, and enjoyment in the process of the activity for a long period of time without experiencing fatigue, distraction, or boredom.
This is mainly an effect of stimulating drugs such as amphetamine, ritalin, and modafinil, but it can also occur on opioids and other substances.