Animals can show symptoms of depression. Here's what that means for the future of their relationship with humans, writes mebwriter
. However, research shows that depressed people also exhibit behavioral, physiological, and cognitive changes. These changes can be objectively assessed in other species, opening the door to comparative investigations.
But how to confirm a diagnosis? MacLellan and her colleagues looked for evidence, in animals, of the same diagnostic criteria used for humans: five or more signs of depression for a period of two weeks or longer.MacLellan identified two research areas on which to focus. First, the researchers reviewed the evidence for depression in laboratory rats deliberately subjected to chronic stress, commonly used in biomedical research to"model" human depression.
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