They do these kinds of studies on mice because mice have a high homology with humans, and a huge number of the findings extrapolate to humans.
But it's one thing to pump a 100g/100g of micro plastics to bodyweight directly into the brain of a mouse and another to study mice in a mostly natural environment filled with plastic dust in similar proportions to what we find in our human lives..
I mean, I can understand doing those kinda of experiments in animals since it would be unethical to do them in humans (not going to discuss the implications of doing tests in animals either, let's just say that doing them in animals is less controversial). But as always the title omits this crucial point of information, mostly probably because this generate more clicks for the website, but I hate this trend so much.