Most people think of perception as just being about information received by the eye.
If that were the case, then perceived size should not have changed because the optical information specifying the size of the goals posts is constant.
This research shows that perception is about more than just the optical system
The researchers want next to investigate whether watching others perform can affect perception.
For example would watching others fail to score cause the watcher to see the goalposts as narrower and limit their own abilities?
Also what are the differences between the role perception plays for professional athletes who practice the sport more than the average person?
Would visualising the target to be bigger, benefit athletes in their sport?Again just as we think we know something we realise that there is a lot we do not know
So far all we can really say with confidence is that performance influences perception.