Which of the following is TRUE regarding the placenta?
a. It secrets hormones that prepare the breasts for nursing.
b. It inhibitscontractions that prompt childbirth.
c. It is also called the amnion.
d. It cannot be seen on an ultrasound.
a
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When Keller and Marian Breland, two psychologists who became animal trainers, decided to train raccoons to drop tokens into a piggy bank, they found that _____
A) food was not an effective reinforcer for the raccoons, and so learning didn't occur B) when given edible roots as reinforcers, the raccoons learned the task in less than ten trials C) the raccoons displayed instinctive drift by rubbing the coins together, dropping them, and rubbing them together again. D) the raccoons showed intrinsic interest in the task and so reinforcement was unnecessary. Incorrect. Reinforcement was necessary to make the behaviors occur.
Which of the following best describes the antisocial personality?
a. low intelligence b. lack of remorse or guilt c. depression d. paranoid schizophrenic tendencies