Altered images: new research shows that what we see is distorted by what we expect to see

Study author Matthew Hudson said that while the experiment pertained to physical movement, it might help us understand how people find out what others are thinking and feeling; in short, why they are behaving in the way they do.

“Primates interpret behaviour as goal-directed and expect others to achieve goals by the most efficient means possible,” he said. “While this is accepted among psychologists, little has been known about its underlying mechanisms. What we have found in this study may be important for various reasons. Firstly, it shows that people make predictions when they see the actions of others. It has been argued for a long while that people constantly make such predictions, and use them to figure out if other people see the same things as we do.

“So imagine you are a passenger in a car, and see a cat run out onto the street. If the driver has seen it, you can picture in your mind that they should now slow down and swerve to avoid it. If they don’t do this, you immediately know that they probably haven’t seen the cat and you can warn them. Such predictions can also be used to coordinate with other people. For example, if we want to do a joint task like catching a ball that someone throws to you, it helps if you already see, in your mind’s eye, what the other person is going to do.

“Finally, the results show that people 'see' others’ actions in the light of their own expectations. If you see someone look at something with a neutral expression and think they are angry, they might look a bit angrier than they really are. This might explain why people often get others’ actions so wrong and see ambiguous behaviour as meaningful.”

Co-author Katrina McDonough added:

“These findings are really helpful for our understanding of how we so effortlessly seem to directly ‘see’ the beliefs, intentions, and emotions drawn onto other people’s actions, and a possible next step to understanding how a deficit in this ability may contribute to the social difficulties encountered by those with autism and schizophrenia.”

The full study, entitled Perceptual teleology: expectations of action efficiency bias social perception, was written by Matthew Hudson, Katrina McDonough, Rhys Edwards, Rob Ellis and Dr Patric Bach from the University of Plymouth School of Psychology. It is available to view in the Proceedings of the Royal Society B (doi: 10.1098/rspb.2018.0638).