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For "permanent" loss of experience of happiness or pleasure, check out the term Anhedonia From my own understanding, a brain can shift between different states of mind. Depression is just one such state. I have a more detailed answer about states of mind here, but the important point is that states of mind color perception of past, present and future. Your ...


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There is a lot of research on depression in animals. Wikipedia has a good summary of the comparison of depression between animals and humans: It is difficult to develop an animal model that perfectly reproduces the symptoms of depression in patients. Many animals lack self-consciousness, self-reflection, and consideration; moreover, hallmarks of ...


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Human depression has been modeled in a variety of animal models, including cats (Wilner, 1984). Cats show comparable signs of distress when subject to maternal separation, including separation phenomena of protest, followed by despair. Although it is hard to project the DSM-V criteria onto cats, they can show comparable behaviors when subject to anxiety and ...



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