The sounds t, th, and sh are:

Ekman conducted a number of studies of facial expressions and found that

A) expression varies from culture to culture. B) there are too many emotions to classify. C) seven primary emotions are almost universal. D) common expressions exist only for happiness.

Laura's heart rate had been conditioned to increase whenever she smelled Old Spice After Shave. However, her heart would also race to the aroma of Brut and English Leather. This reaction is known as

a. shaping. b. stimulus generalization. c. operant conditioning. d. discrimination.