Changing one's attitudes and behaviors to be similar to those of a particular group of

Which of the following is a therapy based on the principles of operant conditioning?

a. systematic desensitization b. flooding c. aversion therapy d. token economy e. in-vivo exposure

It is not until the final period of prenatal development, the _____ stage, that the developing child becomes easily recognizable

a) embryonic b) germinal c) fetal d) birth