How does neuroplasticity affect the reward system in addiction?

In drug addiction, certain substances over-activate the mesolimbic reward circuit, leading to compulsive substance-seeking behavior driven by synaptic plasticity within the circuit. Both drug and behavioral addictions share a common gene transcription factor, delta-FosB, which is involved in these neural adaptations. This structural reorganization reflects the brain's capacity for neuroplasticity, allowing experiences and chemicals to reshape neural pathways.

What we know

• In drug addiction, certain substances over-activate the reward circuit, leading to compulsive substance-seeking behavior resulting from synaptic plasticity in the circuit. [2]
• A gene transcription factor known as delta-FosB has been identified as a necessary common factor involved in both behavioral and drug addictions, which are associated with the same set of neural adaptations. [3]
• The mesolimbic pathway connects the ventral tegmental area to the ventral striatum, and the dysregulation of this pathway plays a significant role in the development and maintenance of an addiction. [5]
• Neuroplasticity refers to the brain's ability to reorganize and rewire its neural connections in response to learning, environmental changes, or stimuli. [4]

Still open

• The exact framework to diagnose and categorize behavioral addiction remains a controversial topic in the psychopathology field.

Where to go next

• how it workedWhat is the mesolimbic pathway?
• a case in pointHow does behavioral addiction work?
• what caused itWhat role does delta-FosB play in neural adaptations?
• the bigger pictureHow does the brain adapt through neuroplasticity?
• how we knowWhat structures make up the reward system?
• an unexpected connectionHow do shopping and drug use trigger the same brain systems?Modern brain scan technologies suggest that chemical and experience-based rewards generate virtually identical reactions and neural adaptations in the brain.

Sources

• [1]reward system (Wikidata Q670713) · CC0 1.0
• [2]Reward system · CC BY-SA 4.0
• [3]Behavioral addiction · CC BY-SA 4.0
• [4]Neuroplasticity · CC BY-SA 4.0
• [5]Mesolimbic pathway · CC BY-SA 4.0