Correct Answer: D

Rationale: The correct answer is D, Serotonin. Serotonin levels are reduced during both the manic and depressive phases of bipolar disorder. Acetylcholine (choice A) is not typically linked to bipolar disorder. Dopamine (choice B) and norepinephrine (choice C) are more commonly associated with conditions like schizophrenia and depression, respectively, rather than bipolar disorder. Therefore, they are not the neurotransmitters reduced in both manic and depressive phases of bipolar disorder.

Correct Answer: A

Rationale: The correct answer is A: Abstraction. Pretending that a block is a car demonstrates abstraction, where one object is used to represent another. Choice B, Preoperational, refers to Piaget's stage of cognitive development. Choice C, Overextension, involves using a word in a broader context than is appropriate. Choice D, Semiotic, refers to the use of symbols to represent ideas or concepts, which is not directly related to the scenario described in the question.

Correct Answer: C

Rationale: In individuals with schizophrenia, blunted affect, or reduced emotional expression, is a common symptom. In this scenario, Charles's lack of emotional response upon hearing about his sister's death aligns with the characteristic of blunted affect. This symptom can manifest as a limited range of facial expressions, monotone voice, and reduced display of emotions. Choice A, 'Clang associations,' refers to a thought disorder characterized by the use of words that sound alike but are not logically connected. Choice B, 'Echolalia,' is the repetition of words spoken by others. Choice D, 'Perseveration,' is the persistent repetition of a response or behavior even when it is no longer appropriate.

Correct Answer: B

Rationale: The corrected question assesses the least likely statement made by a humanist. Choice B, 'The behavior of humans tends to be influenced by environmental circumstances,' is least likely to be made by a humanist. Humanists believe that human behavior is not simply dictated by environmental circumstances but is influenced by a combination of factors, including personal experiences, emotions, and conscious decisions. Choices A, C, and D are more aligned with humanist perspectives. Choice A acknowledges the uniqueness of humans, which is a common theme in humanistic psychology. Choice C reflects the humanistic belief that individuals strive to reach their full potential and self-actualization. Choice D contrasts with humanist views as humanists often consider research on animals to be relevant in understanding human behavior due to shared basic psychological processes.

Correct Answer: C

Rationale: According to the diathesis-stress model, having a predisposition towards mental illness increases the risk but does not guarantee the development of a mental disorder. Choice A is incorrect as the model does not imply certainty. Choice B is incorrect as having a predisposition does affect the chances. Choice D is incorrect as the model does have an impact on the likelihood of developing a mental disorder.