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What is extinction and how might it be used in treating a disorder?
- A. Extinction strengthens the conditioned response by continuously pairing the conditioned stimulus with the unconditioned stimulus.
- B. Extinction is the process of eliminating a conditioned response by repeatedly presenting the conditioned stimulus without the unconditioned stimulus.
- C. Extinction is ineffective and is not used in treating disorders.
- D. Extinction is the process of intensifying the conditioned response by pairing the conditioned stimulus with a stronger unconditioned stimulus.
Correct Answer: B
Rationale: The correct answer is B. Extinction is the process of eliminating a conditioned response by repeatedly presenting the conditioned stimulus without the unconditioned stimulus. This helps in reducing or eliminating undesired behaviors. Choice A is incorrect because extinction does not strengthen the conditioned response but weakens it. Choice C is also incorrect as extinction is a valid technique used in treating disorders by reducing unwanted behaviors. Choice D is incorrect as extinction does not involve intensifying the conditioned response but rather diminishing it.
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How does the diathesis-stress model explain the onset of mental disorders?
- A. Stress alone is sufficient to cause mental disorders.
- B. Both genetic vulnerability and environmental stress are needed to trigger a disorder.
- C. Only genetic factors cause mental disorders.
- D. Environmental stressors alone can cause mental disorders.
Correct Answer: B
Rationale: The diathesis-stress model explains that the onset of mental disorders results from the interaction of genetic vulnerability (diathesis) and environmental stress. Choice A is incorrect because stress alone is not sufficient, according to the model. Choice C is incorrect as it oversimplifies by attributing mental disorders solely to genetic factors. Choice D is incorrect because the model emphasizes the joint contribution of genetic predisposition and environmental stress.
Why is it particularly useful to study identical twins who were raised in different environments?
- A. Differences in brain function can be easily identified.
- B. Concordance rates tend to be higher.
- C. It is possible that the genetics of twins who have been separated have changed in ways to explain any differences found.
- D. It is possible that high concordance rates between identical twins reared together are due to their being treated more similarly than nonidentical twins.
Correct Answer: D
Rationale: Studying identical twins raised in different environments allows researchers to understand the impact of genetics versus environmental factors on traits. Choice A is incorrect because differences in brain function can be influenced by a variety of factors and not solely by environmental differences. Choice B is incorrect as concordance rates tend to be higher in identical twins reared together due to shared genetics and environment. Choice C is incorrect because genetics do not change due to being raised in different environments.
Down syndrome is caused by ________.
- A. a chemical imbalance.
- B. a gene on the X chromosome.
- C. possessing an extra X chromosome.
- D. possessing an extra chromosome in chromosome 21.
Correct Answer: D
Rationale: Down syndrome is caused by possessing an extra chromosome in chromosome 21, not by a chemical imbalance (choice A), a gene on the X chromosome (choice B), or possessing an extra X chromosome (choice C). The presence of an additional chromosome 21 disrupts the normal course of development and leads to the characteristics associated with Down syndrome.
Down syndrome is caused by ________
- A. a chemical imbalance.
- B. a gene on the X chromosome.
- C. possessing an extra X chromosome.
- D. possessing an extra chromosome in chromosome 21.
Correct Answer: D
Rationale: Down syndrome is caused by possessing an extra chromosome in chromosome 21, not a chemical imbalance (choice A), a gene on the X chromosome (choice B), or possessing an extra X chromosome (choice C). The presence of an extra copy of chromosome 21, also known as trisomy 21, leads to the characteristic features and health problems associated with Down syndrome.
Children raised in orphanages tend to have ________.
- A. more cortical gray matter than those raised by their parents.
- B. less cortical gray matter than those raised by their parents.
- C. more friendships than those raised by their parents.
- D. fewer friendships than those raised by their parents.
Correct Answer: B
Rationale: The correct answer is B: 'less cortical gray matter than those raised by their parents.' Studies have shown that children raised in orphanages tend to have less cortical gray matter compared to those raised by their parents. This is due to the lack of individualized care, attention, and stimulation that can negatively impact brain development. Choices A, C, and D are incorrect because there is no direct correlation between cortical gray matter and the number of friendships when comparing children raised in orphanages and those raised by their parents.