What are psychoactive drugs known to affect?

Psychoactive drugs are substances that have the ability to alter brain function, leading to changes in mood, perception, consciousness, cognition, and behavior. These drugs affect neurotransmitter systems and can result in various psychological effects, such as feelings of euphoria, relaxation, or anxiety, depending on the specific substance and its action.

The term "psychoactive" directly refers to the impact these drugs have on the mind, making it the core aspect of their classification. While the correct choice highlights the primary effect of these substances, other bodily systems like metabolism, the digestive system, and the immune system may also be indirectly influenced by the use of psychoactive drugs, but they are not the primary target of these substances. Thus, the focus on the mind accurately captures the essence of what makes a drug psychoactive.