2 Answers

  1. Not the fact that changes in the level of serotonin somehow affect the behavior, because, despite the popularity of the model chemical imbalance, we are still no strong evidence that low levels of serotonin is the cause of depressive behavior, and not just correlated with symptoms of depression (leaving space to change the level of serotonin was the result of depression, not its cause). For example, antidepressants that are known from laboratory tests to increase, lower, or have no effect on serotonin levels.they work with approximately the same efficiency.

  2. Yes, fluctuations in serotonin, dopamine, and endorphins lead to anhedonia and sullenness, which can lead to depression or other psychiatric disorders.

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