The weakening or disappearance of a nonreinforced operant response is called operant

Which of the following criticisms of activity theory is true?

A) Activity theory acknowledges psychological changes in old age where no such changes occur. B) Research shows that older adults who have larger social networks are happier than those who engage in fewer activities. C) Evidence fails to show that older adults seek alternative sources of meaning and gratification in response to social losses. D) Research shows that merely offering older adults opportunities for social contact does not lead to greater social activity.

What neurotransmitter appears to play a significant role in the dependence potential of nicotine?

a) Dopamin b) Serotonin c) Norepinephrine d) GABA