Neurons communicate with each other by sending messages along axons and dendrites via electrical impulses. The axons turn these impulses into chemical signals, sending neurotransmitters across synapses. The receiving dendrite then converts neurotransmitters back into the right electrical signals, so we understand the message; for example, that bite of pie was delicious, I’ll take another one. These exchanges happen countless times in the brain, and they control mood, behavior, movement, and cognition.
An average of about three months of residential treatment seems to be effective. The optimal treatment time seems to be similar in non-residential treatment, suggesting a combination of residential and non-residential treatment might be effective over that time. But completing the treatment program and actively participating seem to be more important than treatment setting or length.
Stimulants, such as tobacco, cocaine or prescription amphetamines, stimulate the brain and nervous system, causing increased alertness. Depressants, such as barbiturates and benzodiazepines, slow activity in the brain and nervous system, causing relaxation. Hallucinogens, such as LSD and PCP, drastically disrupt the way the brain and nervous system communicate, causing hallucinations. Rehab: Last Week Tonight with John Oliver (HBO)