Ideas for a science fair project on psychology?

Question

High school level.

Thanks.

Answer 1

Perhaps something dealing with:
1. Optical illusions; why do we see things differently than they really are?
2. Learning under different conditions; Show that things that make sense are learned faster than things that don't make sense, or that you don't relate to.
3.Dreams
4.Habits

Answer 2

Something on positive or negetive reinforcement would be interesting.