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Addiction and dependence glossary[1][2][3]
  • addiction – a biopsychosocial disorder characterized by persistent use of drugs (including alcohol) despite substantial harm and adverse consequences
  • addictive drug – psychoactive substances that with repeated use are associated with significantly higher rates of substance use disorders, due in large part to the drug's effect on brain reward systems
  • dependence – an adaptive state associated with a withdrawal syndrome upon cessation of repeated exposure to a stimulus (e.g., drug intake)
  • drug sensitization or reverse tolerance – the escalating effect of a drug resulting from repeated administration at a given dose
  • drug withdrawal – symptoms that occur upon cessation of repeated drug use
  • physical dependence – dependence that involves persistent physical–somatic withdrawal symptoms (e.g., fatigue and delirium tremens)
  • psychological dependence – dependence socially seen as being extremely mild compared to physical dependence (e.g., with enough willpower it could be overcome)
  • reinforcing stimuli – stimuli that increase the probability of repeating behaviors paired with them
  • rewarding stimuli – stimuli that the brain interprets as intrinsically positive and desirable or as something to approach
  • sensitization – an amplified response to a stimulus resulting from repeated exposure to it
  • substance use disorder – a condition in which the use of substances leads to clinically and functionally significant impairment or distress
  • tolerance – the diminishing effect of a drug resulting from repeated administration at a given dose

Psychological dependence is a state that involves emotional–motivational withdrawal symptoms, e.g. anxiety and anhedonia, upon cessation of drug use or certain behaviours. It develops through frequent exposure to a psychoactive substance or behaviour, though behavioural dependence is less talked about. The specific mechanism involves a neuronal counter-adaption, which could be mediated through changes in neurotransmittor activity or altered receptor expression. [4][5][6][7][8] Withdrawal symptoms can be attenuated by environmental enrichment and physical activity.[9][10] Psychological dependence is not to be confused with physical dependence, which induces physical withdrawal symptoms upon discontinuation of use. However they are not mutually exclusive.[9][11]

Symptoms edit

Symptoms of psychological dependence include:

[4]

Development edit

Psychological dependence is caused by consistent and frequent exposure to a drug or behavioural activity.[12] It is often associated with effects of drug use, but it can also be caused by behavourial activity e.g. pornography.[13]

The mechanism that generates the dependence involves a neuronal counter-adaption, which is localized to the area where the drugs positive reinforcement stems from. This adaption could occur either as a change in neurotransmittorhyperlänk activity or as an altered receptor expression.[4]

Change in neurotransmittor activity

Studies has shown that in rats going through ethanol withdrawal , stimulant withdrawalor opioid withdrawaal, the nucleus accumbens showed lower levels of serotonin and dopamine than controls. These decreases are associated with depression and anxiety.[5][6]

In anatomically distinct areas of the rat brain, withdrawal causes lower levels of Gamma-Aminobutyric acid, neuropeptide Y and higher levels of dynorphin, corticotropin-releasing factor, as well as norepinephrine. All these changes are linked to psychological dependence.[4]

Altered receptor expression

Changes in receptor expression has also been linked to withdrawal. For example, in rats suffering from nicotine withdrawal it could be observed a down regulation of α6β2*n-icotinic acetylcholine receptors in the mesostriatal dopaminergic pathways.[7]

Methods for reducing dependence edit

A study examined how rats experienced morphine withdrawal in different surroundings. The rats was either placed in an standard environment (SE) or in an enriched environment (EE). The study concluded that EE reduced depression and anxiety withdrawal symptoms.[9]

Another study tested whether swimming exercises effected on the intensity of the psychological morphine withdrawal of rats. It concluded that the anxiogenic and depressive state of the withdrawal was reduced.[10]

Distinction between psychological and physical dependence edit

Table 1: List of different drugs and which type of dependence they induce[11]
Physical dependence Psychological dependence
Alcohols Stimulants
Opioids Hallucinogens
Benzodiazepines Cannabis products
Barbiturates Inhalants
SSRIs

The major differences between psychological dependence and physical dependence are the symptoms they cause. While psychological dependence causes emotional motivational withdrawal ,physical dependence entail somatic symptoms e.g. increased heart rate, sweating and tremor. Different drugs varies in which dependence they induce (see table 1).[11]

Psychological dependence and physical dependence are distinct entitities. However, describing them as mutually exclusive is not satisfactoryinc, since the notion that mind (psychological) and body (physical) are separated is flawed. Empirical studies has shown that even cravings, which are widely associated with psychological dependence, involves a physiological element.[11][14]

See also edit

References edit

  1. ^ Malenka RC, Nestler EJ, Hyman SE (2009). "Chapter 15: Reinforcement and Addictive Disorders". In Sydor A, Brown RY (eds.). Molecular Neuropharmacology: A Foundation for Clinical Neuroscience (2nd ed.). New York: McGraw-Hill Medical. pp. 364–375. ISBN 9780071481274.
  2. ^ Nestler EJ (December 2013). "Cellular basis of memory for addiction". Dialogues in Clinical Neuroscience. 15 (4): 431–443. PMC 3898681. PMID 24459410. Despite the importance of numerous psychosocial factors, at its core, drug addiction involves a biological process: the ability of repeated exposure to a drug of abuse to induce changes in a vulnerable brain that drive the compulsive seeking and taking of drugs, and loss of control over drug use, that define a state of addiction. ... A large body of literature has demonstrated that such ΔFosB induction in D1-type [nucleus accumbens] neurons increases an animal's sensitivity to drug as well as natural rewards and promotes drug self-administration, presumably through a process of positive reinforcement ... Another ΔFosB target is cFos: as ΔFosB accumulates with repeated drug exposure it represses c-Fos and contributes to the molecular switch whereby ΔFosB is selectively induced in the chronic drug-treated state.41. ... Moreover, there is increasing evidence that, despite a range of genetic risks for addiction across the population, exposure to sufficiently high doses of a drug for long periods of time can transform someone who has relatively lower genetic loading into an addict.
  3. ^ Volkow ND, Koob GF, McLellan AT (January 2016). "Neurobiologic Advances from the Brain Disease Model of Addiction". New England Journal of Medicine. 374 (4): 363–371. doi:10.1056/NEJMra1511480. PMC 6135257. PMID 26816013. Substance-use disorder: A diagnostic term in the fifth edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-5) referring to recurrent use of alcohol or other drugs that causes clinically and functionally significant impairment, such as health problems, disability, and failure to meet major responsibilities at work, school, or home. Depending on the level of severity, this disorder is classified as mild, moderate, or severe.
    Addiction: A term used to indicate the most severe, chronic stage of substance-use disorder, in which there is a substantial loss of self-control, as indicated by compulsive drug taking despite the desire to stop taking the drug. In the DSM-5, the term addiction is synonymous with the classification of severe substance-use disorder.
  4. ^ a b c d Koob, George F.; Le Moal, Michel (2008). "Addiction and the brain antireward system". Annual Review of Psychology. 59: 29–53. doi:10.1146/annurev.psych.59.103006.093548. ISSN 0066-4308. PMID 18154498.
  5. ^ a b Diana, M; Pistis, M; Carboni, S; Gessa, G L; Rossetti, Z L (1993-09-01). "Profound decrement of mesolimbic dopaminergic neuronal activity during ethanol withdrawal syndrome in rats: electrophysiological and biochemical evidence". Proceedings of the National Academy of Sciences of the United States of America. 90 (17): 7966–7969. doi:10.1073/pnas.90.17.7966. ISSN 0027-8424. PMC 47268. PMID 8367449.
  6. ^ a b Parsons, L. H.; Koob, G. F.; Weiss, F. (1995). "Serotonin dysfunction in the nucleus accumbens of rats during withdrawal after unlimited access to intravenous cocaine". The Journal of Pharmacology and Experimental Therapeutics. 274 (3): 1182–1191. ISSN 0022-3565. PMID 7562486.
  7. ^ a b Mugnaini, M.; Garzotti, M.; Sartori, I.; Pilla, M.; Repeto, P.; Heidbreder, C. A.; Tessari, M. (2006). "Selective down-regulation of [(125)I]Y0-alpha-conotoxin MII binding in rat mesostriatal dopamine pathway following continuous infusion of nicotine". Neuroscience. 137 (2): 565–572. doi:10.1016/j.neuroscience.2005.09.008. ISSN 0306-4522. PMID 16289885. S2CID 26730060.
  8. ^ Yoneda, Yukio (2005). "Functional Proteins Involved in Regulation of Intracellular Ca2+ for Drug Development: Preface". Journal of Pharmacological Sciences. 97 (3): 337–338. doi:10.1254/jphs.fmj04007x1. ISSN 1347-8613. S2CID 83959833.
  9. ^ a b c Hammami-Abrand Abadi, Arezoo; Miladi-Gorji, Hossein; Bigdeli, Imanollah (April 2016). "Effect of environmental enrichment on physical and psychological dependence signs and voluntary morphine consumption in morphine-dependent and morphine-withdrawn rats". Behavioural Pharmacology. 27 (2 and 3 - Special Issue): 270–278. doi:10.1097/fbp.0000000000000197. ISSN 0955-8810. PMID 26397757. S2CID 11212134.
  10. ^ a b Fadaei, Atefeh; Gorji, Hossein Miladi; Hosseini, Shahrokh Makvand (2015-01-15). "Swimming reduces the severity of physical and psychological dependence and voluntary morphine consumption in morphine dependent rats". European Journal of Pharmacology. 747: 88–95. doi:10.1016/j.ejphar.2014.11.042. ISSN 1879-0712. PMID 25498794.
  11. ^ a b c d "What is pshychological dependence?". 2018-10-29.
  12. ^ "Understanding Tolerance, Dependence, and Addiction". DrugAbuse.com. 2016-06-29. Retrieved 2019-02-23.
  13. ^ "Porn Addiction". PsychGuides.com. Retrieved 2019-03-07.
  14. ^ De Masi, Franco (2016). "Le concept de pulsion de mort est-il encore utile en clinique ?". L'Année psychanalytique internationale. 2016 (1): 157–173. doi:10.3917/lapsy.161.0157. ISSN 1661-8009.


Category:Substance dependence

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