Without dopamine, we wouldn’t be able to feel driven and motivated. Dopamine increases attention, improves cognitive function, and stimulates our creativity. It makes us more social and extroverted and helps us form romantic and parental bonds. Read on to learn more about the function dopamine and whether “dopamine deficiency” can lead to health problems.<\/p>\n
<\/p>\n
Please note:<\/i><\/b> diverse roles of dopamine as a neurotransmitter and hormone don\u2019t necessarily imply any potential benefits of exogenous (outside) sources of dopamine in treatment or supplementation.<\/i><\/p>\n Dopamine is also known as the \u201cmotivation molecule.\u201d It is responsible for intrinsic motivation and provides the motivational\/internal drive to do things (R<\/a>, R<\/a>, R<\/a>).<\/p>\n We do things because we find them rewarding. Dopamine is responsible for reward-seeking behavior (R<\/a>, R<\/a>). It is the main reward signal in the brain.<\/p>\n Activation of dopamine neurons results in a good\/rewarding feeling, while inactivation causes aversion (R<\/a>, R<\/a>).<\/p>\n In animal experiments, high, moderate and low concentrations of dopamine induce euphoric, seeking and aversive states, respectively (R<\/a>).<\/p>\n Dopaminergic activity increases exploration (R<\/a>). And curiosity and interest are important components of intrinsic motivation (R<\/a>).<\/p>\n Across different mammalian species, there is a linkage between dopamine and the positive experiences associated with exploration, new learning and interest in one\u2019s environment (R<\/a>).<\/p>\n People who often experience intrinsically motivated flow states in their daily activities have greater dopamine D2-receptor<\/a> levels in specific brain regions (R<\/a>).<\/p>\n On the other hand, low levels of dopamine make people and animals less likely to work for things. Dopamine blockade severely impairs effortful actions to obtain rewards (R<\/a>).<\/p>\n Mutant mice that do not synthesize dopamine die of starvation owing to a lack of motivation to eat. Restoring neurotransmission in the striatum rescues these animals, whereas restoring it in the nucleus accumbens does not (R<\/a>).<\/p>\n When exposed to a rewarding stimulus, the brain responds by releasing more dopamine (R<\/a>).<\/p>\n During these pleasurable situations, dopamine is released and stimulates one to seek out the pleasurable activity (R<\/a>).<\/p>\n Pleasurable experiences such as sex, food, games or even drug abuse can increase dopamine release (R<\/a>).<\/p>\n This brain reward system promotes survival of the species by rewarding behaviors necessary for continued survival such as seeking food, reproduction, shelter, and drink, etc. These activities that are essential to species survival and activate this pathway are associated with \u2018feeling good\u2019 (R<\/a>).<\/p>\n Histamine<\/a>, acting on histamine H1 receptors<\/a>, can potentiate dopamine receptors to become more sensitive to dopamine (R<\/a>). Therefore, people with higher histamine levels or stronger H1 receptor activation may feel more pleasure from dopamine.<\/p>\n Dopamine does not mediate pleasure. It is known that the loss of dopamine does not affect the feeling of pleasure in humans or animals (R<\/a>).<\/p>\n What it does is enhances the expectation of pleasure in humans (R<\/a>).<\/p>\n This molecule is responsible for \u201cwanting\u201d something but not \u201cliking\u201d something (the hedonic effects of \u201cliking\u201d are mediated by opioids<\/a>) (R<\/a>, R<\/a>, R<\/a>).<\/p>\n Dopamine activity in the brain plays a big part in memory and learning (R<\/a>). It is essential for long-term memory storage and retrieval.<\/p>\n Dopamine signals important events. It helps you remember events that have motivational significance. This ensures that memories are relevant and accessible for future behavior (R<\/a>).<\/p>\n Dopamine also plays an essential role in working memory. Working memory is the capacity to use information from short-term memory and use it to guide your own actions. Dopamine promotes nerve cell activity involved in working memory (R<\/a>).<\/p>\n Serotonin<\/a> also works with dopamine during memory formation. Activation of serotonin receptors can increase dopamine release in parts of the brain that are involved in cognition and memory formation, i.e. the prefrontal cortex and hippocampus) [R<\/a>].<\/p>\n Dopamine release causes an individual to be motivated by certain stimuli. It can control and teach the individual different behaviors. Thus, it plays an important part in reward-driven learning (R<\/a>).<\/p>\n Dopamine has a role in focus and attention (R<\/a>).<\/p>\n Dopamine dysfunction in frontal lobes can cause a decline in attention or even attention deficit disorders (R<\/a>).<\/p>\n Moderate levels of dopamine (not too high or too low) improve the capacity of individuals to switch attention efficiently between tasks. Furthermore, moderate levels of dopamine direct attention more efficiently to stimuli that are relevant to ongoing tasks (R<\/a>, R<\/a>).<\/p>\n Dopamine and its pathways are generally associated with more extroverted behavior (R<\/a>).<\/p>\n For example, higher dopamine levels in 16 male patients were associated with a more extroverted personality (R<\/a>).<\/p>\n There are several major dopamine-related genes that may affect how many dopamine receptors a person has, which in turn can influence the overall activity of the brain’s dopamine system.<\/p>\n For example, according to several studies, people who carry a ‘C’ allele for the DRD4<\/a> SNP rs1800955<\/a> show higher levels of extraversion and novelty-seeking (R<\/a>, R<\/a>). This DRD4 genotype is associated with a greater number of D4 dopamine receptors, and therefore may result in higher dopamine activity — but the available research is limited, and more studies will be needed to fully confirm this finding.<\/p>\n According to another study, carriers of the ‘A’ allele for the DRD2<\/a> SNP rs1800497<\/a> have up to one-third fewer<\/em> D2 dopamine receptors (R<\/a>). However, unlike several other types of dopamine receptors, D2 receptors are inhibitory<\/i>. This suggests that people with this DRD2 variant actually have higher<\/em> overall dopamine activity levels (since their dopamine neurons are less inhibited by D2 receptors) (R<\/a>, R<\/a>, R<\/a>). Consequently, carriers of this allele were also reported to have significantly higher scores on trait extroversion, which fits in with what we know about these receptors (R<\/a>).<\/p>\n (P.S.:<\/strong> If you’d like to know more about the DRD2 gene and its effects on the brain, we recommend checking out the SelfDecode blog post on DRD2<\/a>.)<\/p>\n1) Responsible for Motivation<\/b><\/span><\/h3>\n
2) Increases the Anticipation of Pleasure<\/b><\/span><\/h3>\n
3) Helps with Memory and Learning<\/b><\/span><\/h3>\n
4) Increases Attention and Focus<\/b><\/span><\/h3>\n
5) Makes People More Social and Extroverted<\/b><\/span><\/h3>\n