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Original Poster
Empaths do not have synesthesia, we feel the emotional response that others feel by looking at or hearing them. It has to do with interpersonal connections. Synesthesia involves phantom sensory data, empaths do not receive any of the sensory data, only the emotional reaction. The opposite of a psychopath is theorized in many directions, one being schizophrenia because their amygdalae are over developed and a psychopath's is underdeveloped. Another is social anxiety disorder which people have who often feel like their walking on eggshells around others. An empath is neither of these either, we simply have an over abundance of mirror neurons which causes us to nearly replicate the emotions others experience rather than merely take in a sense of them as someone with an average amount of empathy would do.
However that doesn't mean I rule out a possible relationship between social anxiety disorder and empaths, it's just that they are not always paired. Social anxiety often has to do with more time spent considering others, an empath does not need to consider others more often, they simply feel the same emotional reactions. They may also both bloom from a childhood requirement to tune into their parent's emotions, whether to avoid getting beaten or because their parents were very distant. To be clear, psychology is a spectrum of grades, not categories, so saying what something definitively is and is not is a dubious practice.