By age two, the theory of mind concept is well developed in human children

Biological drives are caused by

a. exceptions to the drive-reduction principle. b. learned behaviors. c. stimuli within the body. d. stimuli outside the body. e. external incentives.

Recall Schachter and Singer's study in which participants were given an injection, then exposed to either a very happy or very angry confederate, then asked about their mood. Which of the following is an independent variable in this study?

a. participant's mood b. gender of the participant c. receiving the injection of epinephrine or a neutral compound d. how many times they hula-hooped with the confederate