Final answer:
It is true that you can develop tolerance for the motor effects of amphetamines, which means higher doses of the drug are needed over time to achieve the same effect.
Step-by-step explanation:
The statement that you can develop tolerance for the motor effects of amphetamines is true. Tolerance is a physiological state where increasing quantities of a drug are required to produce the same effect. With repeated use of amphetamines, which are stimulants that increase wakefulness and provide a sense of increased energy, the body may adjust and become less responsive to the drug. This leads to a need for a higher dose to achieve the desired level of alertness or motor activity. Moreover, stopping the drug abruptly can lead to withdrawal, which is the appearance of a variety of negative symptoms due to discontinuation of drug use.