I don't believe this is true, although I might need some collage medical student noseless blue creature to prove me wrong.
What I gather from this, is that between neurons there are little gaps, one side has tiny nozzles and the other has tiny pores. What happens when the 'emitter' (the nozzle side) is stimulated is it emits a few molecules of dopamine which will make you feel satisfied (for example, drinking a soda then feeling good after that). If you stimulate it for long enough, some of those pores will close up, not allowing dopamine through. This in turn will leave you unsatisfied (you will want more soda to get the same amount of satisfaction.
WARNING
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[This is going to be a long post, sorry for that.]
This is correct and same goes for amphetamines and ecstasy abusers . The substance causes a dramatic increase of serotonin, giving the person an experience of intense confidence, feeling of being free to do anything, easily and overly comfortable, or thinking they are invincible. That's why you see people on X dancing like a fool at a rave - they have completely shut out all care of other people's judgement. They become hyper and seek out anything that makes them feel good. However, a person withdrawing from it will become horribly anxious and paranoid.
It is not that their body is not producing the chemical anymore it is that their receiving neurons have stopped accepting serotonin or whatever neurotransmitter that has been over produced. This is called "re-uptake". That is why you hear of anti depression/anxiety medications such as SSRIs (Selective Serotonin Reuptake Inhibitor) or NRIs (Noripenephrine Reuptake Inhibitor) or DRI's (Dopamine Reuptake Inhibitor) which are commonly used to treat certain types of substance abuse. There is a list of re-uptake inhibitors used to treat both substance abuse and mental health disorders. There are three different neurotransmitters that contribute to stress, anxiety, depression, and ultimately addiction.
Serotonin tends to work on your self esteem, social skills, and rational reasoning. If you have too much, you become out of control and lose a sense thinking things through before you act upon it. If you have too little, you think too much, have little confidence, and fear the worst in any situation. Dopamine is considered the "happy" chemical in your brain. It gives you euphoria and makes you feel on top of the world. People with too much dopamine are excited all the time and have high ambitions and have grandeur ideas. This is called "mania" and is commonly seen with people with bipolar disorder. After a manic stage, the brain realizes that too much dopamine is being produced so it stops accepting it, causing depression. Noreprinephrine underlies the body's flight or fight response, works with adrenal gland, corresponds with other neurotransmitters, and controls how your body reacts to stress. I won't go into too much detail of how noreprinephrine works when there is too much, because it is more about disorders related to the adrenal glands and how it becomes stored in the brain and converted to other chemicals and it gets confusing. I do know that the less noreprinephrine you have, the more you have physical symptoms of depression, stress, and anxiety. A person with too little noreprinephrine can experience conversion disorders (insomnia, stress-related migraines, psychogenic seizures, psychogenic paralysis, etc.). Although they are caused by a mental health issue, these disorders are very real and uncontrollable.
So, if a person is lacking too much in one or more of these neurotransmitters, they can easily fall victim to an addiction or compulsive disorder. Gaming gives us a similar high and affects our neurons in similar ways as drugs/alcohol. Now, what is more important - getting to the highest level you can, or finding a more productive outlet for your daily stresses? Psshhh... no brainer, it's playing Celtic Heroes.
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