Substance dependence alters neural circuits involved in reward, motivation, and self-control. The mesolimbic pathway, involving the ventral tegmental area (VTA) and nucleus accumbens, becomes hyperactive, reinforcing drug-seeking behaviors. The prefrontal cortex, which regulates impulse control, often shows reduced activity, leading to impaired decision-making. Chronic substance use also affects the stress-response system, mediated by the hypothalamus and amygdala, perpetuating cycles of craving and relapse. Advances in neuroimaging have illuminated these disruptions, paving the way for innovative treatments like deep brain stimulation (DBS) and neurofeedback. Understanding these circuits is key to developing targeted therapies for addiction.
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