What Affects Brain Activity?
All vertebrate creatures have a central nervous system operated by the brain, a highly complex organ that acts as central command for the entire body. The brain is the center for sensory, motor, arousal, and neurotransmitting functions in the body. Brain activity is literally the electricity caused by the firing of neurons as the brain goes about its constant routine. As internal and external stimuli change, brain activity may also change. Brain activity can be changed by ingestion or exposure to certain drugs. Most drugs used to treat psychological problems will affect brain activity in some way, but so do many other substances. Caffeine, heroin, antidepressants, and sedatives all can affect how quickly and frequently neurotransmitters fire. While this effect may be temporary, some studies show that prolonged use of a drug can have extended effects.
