A Professor Conducts an Experiment in Which She Asks Her

Multiple Choice

A professor conducts an experiment in which she asks her students to either hold a pen between their teeth or hold a pen between their lips. After five minutes, she finds that the students who held the pen between their teeth reported being happier than those who held it between their lips. These results most strongly support the

A) Schacter-Singer theory.
B) two-factor theory of emotion.
C) Cannon-Bard theory.
D) facial feedback hypothesis.