During the period of the fetus,
A) neurons are first produced.
B) the organism remains awake about 6 hours a day.
C) brain weight increases tenfold.
D) teratogenic damage is the most severe.
C
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Which statement about the impact of autism on children's development is not true?
a. Autism impacts a child's entire behavior repertoire. b. Children with autism often differ considerably in the symptoms they manifest. c. Symptoms tend to change little from one stage of development to another. d. Autism is frequently accompanied by mental retardation. e. Symptoms first appear in infancy or early childhood.
Which of the following best illustrates the concept of negative reinforcement?
A) A man ingests an aspirin to rid himself of a strong headache. B) A woman injects heroin into her veins to obtain a "rush." C) A rat presses a lever that results in delivery of shock through the floor of the chamber. D) A hungry rat presses a lever to obtain a food pellet. E) A child is sent to his room after screaming at the dinner table.