A wave of light proceeds through to the back of the eye where it encounters and stimulates a receptor neuron. What process has taken place?

Based on reports from people who use drugs, which psychoactive substance is least associated with tolerance and withdrawal effects?

a. opiates b. sedatives and hypnotics c. hallucinogens d. cocaine

Because ______________ is a branch of medicine, it is usually practiced by a medical doctor (M.D.)

A) psychiatry B) clinical psychology C) social work D) forensic psychology