Is it possible to prove that emotions exist through the use of brain scans

Read another response by Gabriel Segal
Read another response about Emotion
Is it possible to prove that emotions exist through the use of brain scans (which varies widely among different people in terms of neuron activity)? To clarify, all a brain scan seems to do is prove that neuron activity exists at different levels during different mental states but not the existence of emotion per se. In that sense, isn't emotion similar to the concepts of "chakras," "tao," and "the third eye" in that these ideas may never be scientifically detected or proven yet still exist?

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