But what about the headline of the study? "You Can't Not Believe Everything You Read". So if I read that lead pencils are a health hazard and the next paragraph says that lead pencils are not a health hazard I must believe both right?
That's the "pop" part, to grab the audience. The premise is that when you read something, you take it at face value until something in your mind goes, 'No, wait, that's not right...'
With Descartes, it was suggested that there was a steady sequence: you read, understand, and then assign a value of "yeah, that's right" or "no, wait..."
With Spinoza, the sequence is: you read, you understand, and in understanding you have taken it at face value until something goes, "no, wait..."
I'm not sure I agree with the latter. I would have to read some more.