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The meaning of "quote" here is that there is really no such thing as a "normal" brain, so when the author says "normal brains," he is referring to the brains of "regular, everyday people" (versus psychopaths).
One way to rewrite this would be:
FMRI studies looking for the differences between so-called "normal" brains and individuals who are psychopathic.
Discussion
One way to rewrite this would be:
FMRI studies looking for the differences between so-called "normal" brains and individuals who are psychopathic.