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Concussive blows, most definitely. Repeated touches (i.e. light and playful sparring) no, and there it is unlikely to found as well. Depression is actually quite common after a knock-out. If you've been around a gym with active fighters for a while I'm sure you've seen it. It might come off as lack of confidence after a loss, which might be a factor of course, but a more important variable is concussive blows. When the brain takes damage(concussions) your hormone production is affected as well as your perception. If you give your brain time to heal, it will usually pass in time. Unless you know what is happening though, it can be quite destructive to your relationships.