If you read an article about a controversial issue, do you think you'd realise if it had changed your beliefs? No one knows your own mind like you do—it seems obvious that you would know if your beliefs had shifted. And yet a new paper in the Quarterly Journal of Experimental Psychology suggests that we actually have very poor awareness of our own belief change, meaning that we will tend to underestimate how much we've been swayed by a convincing article.
The researchers recruited over two hundred undergraduates across two studies and focused on their beliefs about whether physical punishment of kids is an effective form of discipline. The students reported their initial beliefs about whether physical punishment is an effective way to discipline a child on a scale from "1" completely disbelieve to "9" completely believe. Several weeks later they were given one of two research-based texts to read: each was several pages long and either presented the arguments and data in favour of physical punishment or against it. After this, the students answered some questions to test their comprehension and memory of the text. Then, the students again scored their belief about whether physical punishment is effective or not. Finally, the researchers asked them to recall what their belief had been at the start of the study.
The students' belief about physical punishment changed when they read a text that argued against their own initial position. Crucially, the memory of their initial belief was shifted in the direction of their new belief—in fact, their memory was closer to their current belief than their original belief. The more their belief had changed, the larger this memory bias tended to be, suggesting the students were relying on their current belief to deduce the initial belief. The memory bias was unrelated to the measures of how well they'd understood or recalled the text, suggesting these factors didn't play a role in memory of initial belief or awareness of belief change.
The researchers concede that this research was about changes to mostly moderate beliefs—it's likely the findings would be different in the context of changes to extreme or deeply held beliefs. However, our beliefs on most topics are in the moderate range, and as we go about our daily lives reading informative material, these intriguing findings suggest we are mostly ignorant of how what we just read has updated and altered our own position.