The smallest difference in intensity of two stimuli required to perceive a difference in intensity 50% of the time is called the _______ _______

A critical thinker would most likely say, "What I need to know most is _____

a) whether the source is an authority." b) whether this fits with what I already think." c) how they got this information." d) how many people agree with this."

To eliminate sources of error in drug research, the researchers use ______ in their research

a. convicted drug dealers c. the case-study approach b. the double-blind procedure d. synthetic imitations of real drugs