Sadness is a universal emotion. Everyone periodically experiences crazy thoughts, irrational impulses, and moments of fear, joy, or forgetfulness. But what if we constantly feel depressed, happy, or forgetful? It may be a sign of a mental condition when regular mental experiences go into overdrive and start interfering with our daily lives. Exaggerations of recurring thoughts, feelings, and behavior are signs of cognitive diseases such as depression, schizophrenia, or dementia. For instance, when you have clinical depression, you don't just feel low periodically; you suffer from crippling sadness over weeks and months. The main takeaway is that improperly functioning brains can tell us how healthy brains function. Brains are similar to costly computers. Our thoughts, feelings, and behaviors are created by billions of tiny, interconnected pieces that cooperate in pre-programmed patterns. In some cases, just like with computers, we can discover the most about how something operates when it doesn't.
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