It’s early days for microplastic studies in general, but especially for studies of microplastics and their effects on our brains. From my knowledge of the literature, as a keen non-specialist, it looks like a great many “common sense” questions aren’t really being posed yet. Or if they are, they aren’t being answered with the kind of urgency the realisation that our brains are filling up with plastic should, in a relatively sane world, demand.