Nutt 9: What is Addiction? Is There An “Addictive Personality”?

The Brain Mechanisms of Addiction

Overview of Addiction

  • Addiction is explained through a combination of pleasure chemicals in the brain and the learning processes related to repeated behaviors.

  • It involves numerous complicated mechanisms and various neurotransmitters.

Positive and Negative Elements of Drug Experience

  • Positive Elements:
      - Pleasure: Drugs can create feelings of euphoria.
      - Powerful Memories: Certain experiences can engrave significant long-term memories.
      - Reducing Suffering: Drugs can alleviate pain and discomfort.
      - New Meanings: Users may derive deep meanings from experiences under drugs.

  • Negative Elements: (Push Factors)
      - Impulsivity: Users may prioritize immediate effects without considering long-term consequences.
      - Compulsion: Compulsive and repetitious behaviors lead to loss of control, increasing the desire to experience the positive elements despite awareness of negative consequences.
      - Withdrawal: Unpleasant or life-threatening withdrawal symptoms enhance compulsive behavior to avoid discomfort.

Neurotransmitters Involved in Addiction

  • Dopamine: Linked to drive, desire, and reward.

  • Endorphins: Associated with pleasure and pain relief.

  • GABA and Glutamate: Primarily involved in the regulation of memory.

  • Serotonin: May be involved in attributing meaning to experiences.

  • Noradrenaline: Linked to impulsivity and compulsivity, explaining the therapeutic effects of amphetamines on attention disorders.

The Biological Analysis of Addiction

  • The biological perspective emerged due to early 20th-century discoveries about brain chemistry.

  • Neuroimaging advancements have shown physical changes in the brain due to repeated drug use, recognizing addiction as a