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Related Concept Videos

Drug Dependence01:17

Drug Dependence

Medications are typically administered to achieve therapeutic effects. Some drugs can modify an individual's mood and perception, frequently resulting in various enjoyable experiences. However, this can result in drug dependency, a condition marked by continuous drug use despite potential negative consequences. Drug dependency primarily falls into two categories: psychological and physical dependence. Psychological dependence occurs when the pleasurable feelings induced by the drug...
CNS Depressants: Alcohol and Nicotine01:27

CNS Depressants: Alcohol and Nicotine

Ethanol, a clear colorless alcohol, has been consumed by humans for millennia, but its effects on the body are far from benign. At lower doses, it induces decreased inhibitions and loquaciousness, leading to its social appeal. However, it can cause severe consequences at higher doses, such as coma and respiratory depression, due to its zero-order elimination kinetics. Chronic ethanol abuse wreaks havoc on multiple organ systems, particularly the CNS and the liver. Abrupt cessation of ethanol...
Drug Abuse and Addiction: Pharmacological Phenomena01:15

Drug Abuse and Addiction: Pharmacological Phenomena

Drug dependence, abuse, and addiction are complex phenomena that can precipitate various abnormal states. Physical dependence refers to a state of pharmacological adaptation to a drug. This adaptation often results in tolerance—a reduced response to the drug after repeated administrations. When the drug use is abruptly stopped, withdrawal symptoms occur due to the body's need to readjust from the pharmacologically induced imbalance. However, tolerance and withdrawal symptoms do not necessarily...
Drugs Acting on Autonomic Ganglia: Stimulants01:23

Drugs Acting on Autonomic Ganglia: Stimulants


Ganglionic stimulants activate NM nicotinic receptors in autonomic ganglia, falling into two categories: nicotine mimetics [e.g., lobeline, dimethylpiperazine, tetramethylammonium] and muscarinic receptor agonists [e.g., muscarine, methacholine]. The first category's action is rapid and blocked by nicotinic receptor antagonists, while the second category's action is delayed and blocked by atropine-like agents. Nicotine, an alkaloid, affects the heart rate by stimulating sympathetic or...
Stimulants01:29

Stimulants

Stimulants are substances that enhance neural activity and elevate dopamine levels in the brain, leading to their highly addictive nature. These drugs include cocaine, amphetamines, MDMA, caffeine, and nicotine, each with distinct mechanisms of action and varied health implications.
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Psychological and Sociocultural Causes of Schizophrenia

Schizophrenia, a complex psychiatric disorder, has been historically misunderstood. Early psychological theories attributed its origins to childhood trauma and unresponsive parenting. However, contemporary research largely rejects these notions, favoring the vulnerability-stress hypothesis. This model proposes that individuals with a genetic predisposition to schizophrenia may develop the disorder following exposure to significant environmental stressors. Notably, studies on high-risk...

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Short- and long-lasting consequences of in vivo nicotine treatment on hippocampal excitability.

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Cellular events in nicotine addiction.

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Demonstration of functional alpha4-containing nicotinic receptors in the medial habenula.

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Related Experiment Video

Updated: May 30, 2026

A Protocol for Measuring Cue Reactivity in a Rat Model of Cocaine Use Disorder
07:51

A Protocol for Measuring Cue Reactivity in a Rat Model of Cocaine Use Disorder

Published on: June 18, 2018

Cognitive mechanisms underlying relapse to nicotine.

Robin A J Lester1

  • 1Department of Neurobiology and The McKnight Brain Institute, University of Alabama at Birmingham, AL 35294, USA. nicotine@uab.edu

Reviews in the Neurosciences
|July 28, 2011
PubMed
Summary

Nicotine addiction is driven by learned cues that trigger drug seeking. Chronic nicotine use causes lasting brain changes in the hippocampus, increasing relapse risk even after long abstinence.

Area of Science:

  • Neuroscience
  • Addiction Research
  • Neurobiology of Nicotine

Background:

  • Learned contextual associations are key to nicotine addiction.
  • These associations act as powerful cues for drug use and relapse.
  • Nicotine's addictive potential is linked to these secondary cues.

Purpose of the Study:

  • To review evidence on chronic nicotine's effects on hippocampal circuitry.
  • To emphasize the dentate gyrus's role in initiating drug use.
  • To relate neuroadaptations to cognitive deficits and relapse.

Main Methods:

  • Review of existing scientific literature on nicotine and the hippocampus.
  • Analysis of neuronal excitability changes in the dentate gyrus.
  • Examination of cognitive deficits associated with nicotine withdrawal.

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A Prediction Error-driven Retrieval Procedure for Destabilizing and Rewriting Maladaptive Reward Memories in Hazardous Drinkers
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A Prediction Error-driven Retrieval Procedure for Destabilizing and Rewriting Maladaptive Reward Memories in Hazardous Drinkers

Published on: January 5, 2018

Related Experiment Videos

Last Updated: May 30, 2026

A Protocol for Measuring Cue Reactivity in a Rat Model of Cocaine Use Disorder
07:51

A Protocol for Measuring Cue Reactivity in a Rat Model of Cocaine Use Disorder

Published on: June 18, 2018

A Prediction Error-driven Retrieval Procedure for Destabilizing and Rewriting Maladaptive Reward Memories in Hazardous Drinkers
08:05

A Prediction Error-driven Retrieval Procedure for Destabilizing and Rewriting Maladaptive Reward Memories in Hazardous Drinkers

Published on: January 5, 2018

Main Results:

  • Chronic nicotine induces persistent changes in hippocampal neuronal excitability.
  • The dentate gyrus is identified as a critical site for initiating drug use.
  • Early neuroadaptations are reversible with acute nicotine but may become permanent.

Conclusions:

  • Hippocampal changes influenced by nicotine contribute to addiction.
  • These changes can lead to persistent alterations driving craving and relapse.
  • Understanding these mechanisms is crucial for treating nicotine addiction and preventing relapse.