The popular interest in the brain means that we increasingly have a “folk neuroscience” that is strongly linked to personal identity and subjective experience. Like folk psychology it is not necessarily very precise, and sometimes wildly inaccurate, but it allows us to use neuroscience in everyday language in a way that wasn’t previously credible for non-specialists.
Folk neuroscience comes with the additional benefit that it relies on concepts that are not easily challenged with subjective experience. When someone says “James is depressed because he can’t find a job”, this may be dismissed by personal experience, perhaps by mentioning a friend who was unemployed but didn’t get depressed. When someone says that “James is depressed because of a chemical imbalance in his brain”, personal experience is no longer relevant and the claim feels as if it is backed up by the authority of science. Neither usefully accounts for the complex ways in which our social world and neurobiology affect our mood but in non-specialist debate that rarely matters. As politicians have discovered it’s the force of your argument that matters and in rhetorical terms, neuroscience is a force-multiplier, even when it’s misfiring.