An experiment that does not allow for the determination of causality lacks:

Difficulty concentrating is an internalizing problem

Indicate whether this statement is true or false.

You are at a carnival and go into a fun house in which mirrors create distorted images of you and your friends, while flashing lights cause apparent "movements of objects" where there is no movement. These are examples of

a. sane hallucinations. b. illusions. c. figure-ground reversible figures. d. contiguity.