Motivation and emotion/Book/2025/Alcohol, dopamine, motivation, and emotion

Alcohol, dopamine, motivation, and emotion:
What role does dopamine play in motivational and emotional responses to alcohol consumption?

Overview

Figure 1. Example of what someone would be thinking about in relation to the scenario. Think about this ... Have you ever wondered what motivates you to reach for an alcoholic drink? Maybe it’s the memory of feeling more confident at a party, or how that first sip seemed to melt the stress away after a long day. Those pleasurable emotions ignite your brain’s dopamine pathway, strengthening the link between alcohol and reward. The next time you see a drink, hear the pop of a bottle, or even think about that past experience, your brain may push you to seek it out again. Over time, this cycle of pleasure then motivation then more drinking can become so strong that it’s hard to break.

According to World Health Organisation (WHO), one of the most widely consumed substances in the world is alcohol. In 2019, alcohol use was responsible almost 2.6 million fatalities worldwide. Individuals between the ages of 20 and 39 are most impacted by alcohol use and, in 2019, the largest percentage (13%) of alcohol related deaths occurred in this age group (WHO, 2024). Although it is categorised as a central nervous system depressant, alcohol can initially produce stimulant-like effects. Its impact on brain chemistry may lead to behavioural changes, emotional instability, and diminished cognitive abilities. The development of alcohol-related disorders, including acute intoxication, chronic misuse, and dependence are greatly influenced by neurochemical alterations (Hui, & Zhu, 2014). Alcohol consumption is linked to mental health and behavioural disorders such as depression, anxiety as well as diseases such as liver disease and heart disease (WHO, 2024). Neuroscience can provide valuable insights to understanding how dopamine influences our emotional and motivation responses to alcohol. By understanding the brain's reward system and how it interacts with alcohol, researchers can develop strategies to address alcohol misuse and addiction (Gilpin, & Koob, 2008).

Focus questions What is the role of dopamine? How does dopamine influence motivation? What emotions does dopamine influence? Why does the effect of dopamine in emotional and motivation responses lead to addiction?

The role of dopamine

What is dopamine?

Dopamine is a neurotransmitter and a hormone that is responsible for functions including motivation, movement, pleasure, and learning. Dopamine drives a person’s behaviour in the direction of or drive them away from reaching a result by signalling the perceived motivational importance meaning the desirability of that outcome (Hamid et al., 2016). Dopamine has essential roles regulating motor neurons, spatial memory function, motivation, arousal, reward, pleasure, as well as lactation, sexual, and maternal behaviours. Movement and motor control, spatial memory function, motivation, arousal, reinforcement, reward, sleep regulation, attention, affect cognitive function, feeding, olfaction, hormone regulation, and influences the immune, system cardiovascular, gastrointestinal, and renal systems are all areas which the dopaminergic system plays crucial parts in (Klein et. al., 2018).

The effect of alcohol on dopamine activity

Alcohol consumption increases the release of dopamine in the brain, producing pleasurable and rewarding sensations that contribute to feelings of relaxation and euphoria. This spike in dopamine reinforces the immediate experience of drinking but also plays a role in the development of continued alcohol use and over time, can lead to addiction. Motivation signals might impact the functioning of brain regions that can support different behavioural tasks by activating dopaminergic neurones. This process could be one of the causes of the numerous ways that dopamine influences behaviour. The nucleus accumbens (NAc), which often reacts to natural rewards like food (enjoyable activities), has a crucial mechanism known as phasic signalling. This process is key for motivational learning, where something neutral becomes motivating after being repeatedly linked with a reward. For example, the act of walking through your door at the end of the day can gradually cause an urge if you always relax with an alcoholic beverage after work. This is because dopamine connects these cues to pleasurable effects of drinking, the smell or sound of a bottle cap or pop of a bottle can become powerful cues that encourage alcohol use. Alcohol can stimulate dopamine release through it's sensory properties, such as taste (Chiara, 1997).

Alcohol's Activation of the Mesolimbic System

The Mesolimbic Pathway consists of dopamine that originates from the ventral tegmental area VTA of the midbrain and projects to the nucleus accumbens. This system is often often called the reward pathway that affects motivation, reward, and cognitive processes (Engel & Jerlhag, 2014). This circuit is crucial for incentive salience (motivation), reinforcement learning, the internal drive to seek rewards, and aspects of reward-related cognition. Dysregulation of this pathway is closely linked to addiction, among other conditions (Alcaro et. al., 2007). Experimental data has shown that alcohol activates this system by increasing the firing of VTA dopamine neurons (Engel & Jerlhag, 2014). This direct stimulation of the mesolimbic dopamine pathway can be a way to understand the rewarding affects of alcohol and the motivation for alcohol- seeking behaviours. Once alcohol has entered the body, ethanol is then broken into acetaldehyde and other compounds such as salsolinol (Deehan et. al., 2023). Acetaldehyde and salsolinol are active chemicals that are reinforced when administered into the reward parts of the brain. They can increase the amount of dopamine release in the nucleus accumbens (Deehan et. al., 2023).

Check your knowledge Alcohol’s pleasurable effects are mainly due to its activation of the brain’s mesolimbic dopamine pathway, which increases motivation to drink again. True False

Dopamine and Motivation Responses to Alcohol Consumption

Dopamine's role in motivation

For motivation to occur in situations where rewards have been experienced, the brain relies on the stimulus reward link, connections between a specific cue or environment and the reward that had previously followed it in the past. Over time, these connections lead to habitual responses, for example if you see a specific food item or brand that you are familiar with may automatically makes you want to have it due to previous pleasure associated with it. These habits are driven by existing memories of previous dopamine driven rewards. However if dopamine activity is consistently reduced (repeated exposure without reinforcement) this stimulus reward link is weakened. As a result, the motivation to seek or pursue the reward, decreases over time because the brain no longer finds the stimulus rewarding (Klein et. al., 2018).

The brain is designed for survival so it seeks the fastest and easiest source if positive emotion and to avoid pain. This can explain why we tend to prefer the fastest and easiest source of reward, such as junk food, social media and gambling as they provide a spike in dopamine that is faster compared to slower and rewards that require more effort. This same system is what motivates us to eat, drink, bond and explore. Engaging in beneficial behaviours, such as consuming food when you are hungry, triggers the brain to release dopamine, this promotes pleasure and reinforces the behaviour. In our current society, individuals get carried away by easily accessible stimuli that activate the brains reward pathways with things such as sugary and salty foods, nicotine, drugs and alcohol (Moccia et. al., 2018).

Dopamine's role in motivational responses to alcohol consumption

Figure 2. A representation of the cycle of drinking alcohol and the loop affects.

Dopamine contributes to the motivation effects from alcohol by reinforcement and driving reward-seeking behaviours. DA transmission is crucial for creating a state of motivation to seek rewards and for establishing memories of cue reward associations. Dopamine released during alcohol consumption strengthens the desire to drink again in the future. An important note to make is that dopamine does not necessarily make alcohol pleasurable but rather is becomes "wanting in the sense of motivating actions to achieve it". This motivational drive can be explained by a modified "Hebbian rule" neurons that fire together wire together as long as they get a burst of dopamine, due to the hypothesis that dopamine controls synaptic plasticity (Bromberg-Martin et.al., 2010).

When an individual consumes alcohol, to sets off a significant spike of dopamine in the brain's reward centre. This intense dopamine increase creates a powerful, pleasurable feeling that reinforces the brain to associate alcohol with pleasurable emotions. Alcohol's affects on cognitive function impairs the ability to follow through goal directed behaviours and increases the willingness to act without planning. After drinking, dopamine levels fall below baseline, which leaves you reduced motivation for every day activities and can leave you with feelings of 'hang-anxiety' as common symptoms of a hangover. However due to the intense spike in dopamine that created powerful feelings of pleasure which reinforces the association between alcohol and positive emotional states, people tend to keep. If you are drinking regularly it requires increase amounts to achieve the same rewarding effects as your body has built up a high tolerance (Le et al., 2022).

Dopamine and emotional responses to alcohol consumption

Dopamine's role in emotion recognition and processing

The role of dopamine in emotional recognition and emotional processing remains uncertain, as research has manipulated dopamine in healthy individuals have produced inconsistent neutral results and little behavioural evidence. However, there has been research that has found that low levels of dopamine are associated with emotional apathy or anhedonia (Yin, 2019). Interestingly, emotional responses such as stress and anxiety can actually increase dopamine in certain brain areas.

Research has proposed an inverted U-shaped relation between dopamine levels and task performance, suggesting that too much and too little dopamine can impair cognitive function. For tasks like emotional recognition, there appears to be an ideal level of dopamine and dopaminergic manipulation can move people closer to or farther away from that ideal depending on their baseline levels. This supports that there is an ideal dopamine level for every task, which emphasises the inverted U-shaped association (Schuster et. al., 2022).

Extremely high dopamine levels have been linked to symptoms of borderline personality disorder such as mood instability and impulsivity. Evidence suggests that slightly positive emotional states raise dopamine levels in the brain and other organs, as well as active immune responses, even though a direct correlation between dopamine levels and the motivational intensity of positive emotions is not well understood. Many of the cognitive advantages of pleasant emotions, such as increased creativity and cognitive flexibility, seem to be mediated by the mesolimbic dopamine pathway, which is essential for reward and motivation (Yin, 2019).

Dopamine role in emotional responses to alcohol consumption

Alcohol can change the way dopamine works in the brain, which can make stimuli such as social interaction feel more fun and rewarding, while also making it harder to notice negative emotions in others. Alcohol consumption alone does not cause dopamine to react. Rather than being triggered by reward consumption, the DA neuron responses resemble a 'reward prediction error'. Which indicates the difference between the reward that is received and the reward that was predicted to occur. So that means if a reward is greater than predicted, the DA neurons are strongly excited which is positive prediction error. As well as if a reward is smaller than predicted the DA neurones slowly suppressed, negative prediction error. With emotional responses to alcohol, negative prediction error can explain why alcohol can trigger intense emotional reactions such as disappointment leading to cravings or dissatisfaction, and contrastingly, unexpected pleasurable feelings can elevate mood (Bromberg-Martin et.al., 2010).

Check your knowledge Only positive emotions are influenced by dopmaine; False True

Anhedonia

Anhedonia is a common symptom of major depressive disorder the ability to feel pleasure, motivated or enjoyment from activities that someone used to find enjoyable. According to some theories, addiction is caused by a disturbed connected with the brain's reward system, which implies that the person's natural ability to feel happiness or contentment has been affected (Yevarouski, 2018). Chronic alcohol consumption throws this system off balance, anhedonia has been found to be a common characteristic in alcoholics (Hatzigiakoumis et al., 2011). In this condition the inability to derive pleasure from everyday soucres results from the brain ebing less respomsive to natural dopamine sources and drinking helps someone feel "normal" or ease emotional distress rather than producing strong euphoric feelings (Yevarouski, 2018).

Addiction and dopamine

The definition of alcohol addiction

Compulsive drinking, a loss of control over intake, and the development of a negative emotional state when alcohol is unavailable are all symptoms of alcohol addiction, a chronic relapsing condition. An inability to regulate or quit drinking alcohol in spite of negative social, professional, or health effects is the feature of alcohol use disorder (AUD) (National Institute on Alcohol Abuse and Alcoholism, 2021).

Figure 3. Symbolic representation of alcohol addiction

The dopamine system in addiction

The dopamine system plays a central role in addiction by creating a "progressive narrowing of pleasure sources, where only the addictive stimulus provides satisfaction. The alcohol causes an increase in dopamine fast, when someone has an addiction they are craving that dopamine peak. They crave all the things associated with the feeling of being under the influence, cravings are strong motivational states that drive to desire and consume specific substance. The higher the peak in dopamine and the faster the rise means that once the alcohol finally wears off, it drops further below baseline. That drop below baseline creates a lack of pleasure which leads to more alcohol intake and this is where the vicious cycle takes place (Diana, 2011).

The development of addiction

Simulation related to alcohol develops extreme motivational qualities that create a strong urge to consume alcohol beverages (cravings) which leads to the development of psychological dependence on alcohol. This strong desire causes normal reinforces such as food, sex, family, work, or hobbies, lose their meaning and just affect the drinker's behaviour ( Chiara, 1997)

Withdrawal

Dopamine dysregulation during withdrawal reinforces addiction by generating a motivational urge to continue alcohol consumption in order to cope with unpleasant emotions. Research has shown that stimuli that is I linked to alcohol or withdrawal can encourage recurrent alcohol-seeking behaviour in conditioned positive and negative reinforcement. Positive and negative reinforcement both influence alcohol-drinking behaviour, but their corresponding effects shift as alcohol use progresses to abuse and dependence (Gilpin & Koob, 2008).

Dopamine is crucial in the early phases of alcohol consumption because it contributes to the enjoyable reinforcing effects of alcohol. However, alcohol can be used as well for its negative reinforcing effects, such as easing emotional discomfort or mental health symptoms in those with comorbid psychiatric illnesses. Drinking is frequently motivated by avoiding discomfort rather than pleasure when alcohol usage develops into dependence. Although dopamine is less directly engaged in this negative reinforcement, it nonetheless contributes to the regular character of alcohol use at this stage, when people may drink largely to avoid withdrawal symptoms (Gilpin & Koob, 2008).

Conclusion

The connection between motivation, emotional processing, and alcohol use is mostly facilitated by dopamine. In the brain's reward system, alcohol increases dopamine release, especially in the mesolimbic pathway, which reinforces positive effects and promotes repeated consumption. Due to its ability to simultaneously increase the brain's reward processing system, which mediates pleasure, and decrease the activity of the brain's systems that mediate negative emotional states, such as stress, anxiety, and emotional pain, alcohol is simultaneously reinforcing. Since dopamine-driven learning processes link alcohol-related cues to rewards, this reinforcement eventually plays a role in the development of addiction by causing compulsive behaviours and cravings. Alcohol increases dopamine release in the nucleus accumbens, creating a strong “motivational kick” that encourages further drinking. Additionally, dopamine affects emotional processing and incentive to seek alcohol, which can lead to mood instability, impulsivity, and anhedonia, particularly in cases of chronic usage. Alcohol consumption can become a loop where people drink for pleasure and to prevent psychological discomfort or withdrawal symptoms as a result of these emotional and motivational disturbances. Dopamine plays a central role in both the motivational and emotional responses to alcohol consumption by driving the desire to seek alcohol and by shaping the emotional states associated with drinking.

See also

• Motivation and emotion, boredom and substance use (Book chapter, 2025)

References

Bromberg-Martin, E. S., Matsumoto, M., & Hikosaka, O. (2010). Dopamine in motivational control: Rewarding, aversive, and alerting. Neuron, 68(5), 815–834. https://doi.org/10.1016/j.neuron.2010.11.022

Deehan, G. A., Jr., Hauser, S. R., Wilden, J. A., Truitt, W. A., & Rodd, Z. A. (2013). Elucidating the biological basis for the reinforcing actions of alcohol in the mesolimbic dopamine system: The role of active metabolites of alcohol. Frontiers in Behavioral Neuroscience, 7, 104. https://doi.org/10.3389/fnbeh.2013.00104

Di Chiara, G. (1997). Alcohol and dopamine. Alcohol Health and Research World, 21(2), 108–114. https://pmc.ncbi.nlm.nih.gov/articles/PMC6826820/

Diana, M. (2011). The dopamine hypothesis of drug addiction and its potential therapeutic value. Frontiers in Psychiatry, 2, 64. https://doi.org/10.3389/fpsyt.2011.00064

Engel, J. A., & Jerlhag, E. (2014). Alcohol: Mechanisms along the mesolimbic dopamine system. Progress in Brain Research, 211, 201–233. https://doi.org/10.1016/B978-0-444-63425-2.00009-X

Gilpin, N. W., & Koob, G. F. (2008). Neurobiology of alcohol dependence: Focus on motivational mechanisms. Alcohol Research & Health, 31(3), 185–195. https://pmc.ncbi.nlm.nih.gov/articles/PMC2770186/

Hatzigiakoumis, D. S., Martinotti, G., Giannantonio, M. D., & Janiri, L. (2011). Anhedonia and substance dependence: Clinical correlates and treatment options. Frontiers in Psychiatry, 2, 10. https://doi.org/10.3389/fpsyt.2011.00010

Klein, M. O., Battagello, D. S., Cardoso, A. R., Hauser, D. N., Bittencourt, J. C., & Correa, R. G. (2019). Dopamine: Functions, signaling, and association with neurological diseases. Cellular and Molecular Neurobiology, 39, 31–59. https://doi.org/10.1007/s10571-018-0632-3

Le, T. M., Chen, Y., Chaudhary, S., & Li, C.-S. R. (2022). Problem drinking and the interaction of reward, negative emotion, and cognitive control circuits during cue-elicited craving. Addiction Neuroscience, 1, 100004. https://doi.org/10.1016/j.addicn.2021.100004

Ma, H., & Zhu, G. (2014). The dopamine system and alcohol dependence. Shanghai Archives of Psychiatry, 26(2), 61–68. https://doi.org/10.3969/j.issn.1002-0829.2014.02.002

Moccia, L., Mazza, M., Di Nicola, M., & Janiri, L. (2018). The experience of pleasure: A perspective between neuroscience and psychoanalysis. Frontiers in Human Neuroscience, 12, 359. https://doi.org/10.3389/fnhum.2018.00359

Schuster, B. A., Sowden, S., Rybicki, A. J., Fraser, D. S., Press, C., Holland, P., & Cook, J. L. (2022). Dopaminergic modulation of dynamic emotion perception. The Journal of Neuroscience, 42(21), 4394–4407. https://doi.org/10.1523/JNEUROSCI.2364-21.2022

World Health Organization. (2024.). Alcohol. World Health Organization. https://www.who.int/news-room/fact-sheets/detail/alcohol

Yin, J. (2019). Study on the progress of neural mechanism of positive emotions. Translational Neuroscience, 10, 93–98. https://doi.org/10.1515/tnsci-2019-0016

Yevarouski, V. (2018). Hijacking sorrow, joy, pleasure and reward: A philosophical interpretive framework for the theory of alcohol addiction. Sociologija. Mintis ir veiksmas, 41(2), 117–124. https://doi.org/10.15388/SocMintVei.2017.2.11724

External links

• 2 minute video on Dopamine (Youtube)
• Hang-Anxiety(Alcohol and Drug Foundation)
• Dopamine: Driving Your Brain into the Future (Ted Talk)
• Misunderstanding Dopamine (Ted Talk)
• Breaking the Cycle: Redefining Pleasure in the Dopamine Age (Ted Talk)