a)
The experiment was about how visual images affect people's behaviour in terms of honesty.
c)
- are being watched
- are unobserved
- an experiment / a recent experiment
- psychology
- belief
- an honesty box
- changed / alternated the image
- more honest
- three times
d)
- So that we know if we are being watched.
- They behave less selfishly.
- They were surprised.
- A poster of faces or eyes could be used for the warnings about speed cameras instead of a picture of a camera.
- Near CCTV cameras in town centres.