I personally do not feel that psychological experiments sufficiently test the way we comprehend language. This is mainly because every person has a different way of interpreting language, no matter how small the discrepancy. As such, the tests and experiments do not accurately portray the way of thinking of us when we try to comprehend language.

Also, these experiments such as "the Apple on the Towel in the Box" and "The woman hit the man with the umbrella" give only two outcomes: Apple on the towel, or towel in the box; Woman hit the man with the umbrella, or man with the umbrella. This only shows that the crafter of these sentences do not have the ability to speak accurately and therefore leaves the sentence to interpretation.

But psycholinguistics is cool, and surely there are more accurate and defining tests out there. ;D