What does drug abuse do to the brain?
The human brain, a marvel of complexity, governs all facets of our existence. This intricate organ, weighing merely three pounds, orchestrates every aspect of human activity. The brain is indispensable from essential bodily functions to the enjoyment of everyday pleasures. It regulates fundamental bodily processes, interprets stimuli, and guides behavior. Essentially, the brain encapsulates your thoughts, emotions, and identity, shaping your very being.
Drug abuse disrupt the intricate process of neural communication by affecting how neurons transmit, receive, and process signals through neurotransmitters. For instance, substances like marijuana and heroin possess brain chemicals makeup resembling natural neurotransmitters, enabling them to bind to and activate neurons.
However, their activation doesn't mirror that of natural neurotransmitters, leading to distorted messages within the neural network.
Conversely, drugs like amphetamine or cocaine prompt neurons to release excessive amounts of neurotransmitters or hinder their regular recycling, further distorting or intensifying neural communication
Substance abuse can impact vital brain regions crucial for sustaining life functions and driving compulsive drug-seeking behaviors associated with addiction. These include the basal ganglia, which play a pivotal role in positive motivation, encompassing pleasurable experiences like eating, socializing, and sexual activities, as well as habit formation.
Terming the brain's 'reward circuit,' these areas are excessively stimulated by drugs, leading to the euphoria of a drug-induced high. However, with prolonged use, the circuitry adapts, reducing its sensitivity and impairing the ability to derive pleasure from non-drug-related cues.
The extended amygdala is involved in generating stressful emotions such as anxiety, irritability, and unease, commonly experienced during withdrawal once the drug's effects wear off. This heightened sensitivity of the circuit drives individuals to seek the drug again.
With continued drug use, this circuit becomes increasingly reactive. Consequently, individuals with substance use disorder may resort to drugs not solely for the euphoric effects but rather to alleviate the discomfort of withdrawal symptoms.
Lastly, the prefrontal cortex controls decision-making and impulse control, particularly vulnerable during adolescence. Imbalances between this area and others involved in motivation and emotional response drive compulsive drug-seeking behavior in individuals with substance use disorder. Furthermore, opioids and other drugs can disrupt vital brainstem functions, such as regulating breathing and heart rate, leading to fatal overdoses.
