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  3. Scientists researching hypnosis have uncovered evidence that counters some of the skepticism about the technique. One skeptical

Scientists researching hypnosis have uncovered evidence that counters some of the skepticism about the technique. One skeptical

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问题     Scientists researching hypnosis have uncovered evidence that counters some of the skepticism about the technique. One skeptical hypothesis is that hypnosis may be the product of "vivid imagination", a now discredited charge stemming from the observation that many people who are hypnotizable can be led to experience compellingly realistic auditory and visual hallucinations. Nothing that an auditory hallucination and the act of imagining a sound are both self-generated and that,like real hearing,a hallucination is experienced as the product of an external source, Henry Szechtman used PET (positron emission tomography) to image the brain activity of hypnotized subjects invited to imagine a scenario and then experiencing a hallucination. By monitoring regional blood flow in areas activated during both hearing and auditory hallucination but not during simple imagining, the investigators sought to determine where in the brain a hallucinated sound is mistakenly "tagged"as authentic and originating in the outside world.
    Szechtman imaged the brain activity of eight very hypnotizable subjects who had been prescreened for their ability to hallucinate under hypnosis. During the session,the subjects were under hypnosis and lay in the PET scanner with their brain activity being monitored under four conditions:at rest;while hearing an audiotape of a voice,while imagining hearing the voice again;and during the auditory hallucination they experienced after being informed that the tape was playing once more,although it was not. The tests suggested that a region of the brain called the right anterior cingulate cortex was just as active while the vol-unteers were hallucinating as it was while they were actually hearing the stimulus. In contrast, that brain area remained dormant while the subjects were imagining that they heard the stimulus.
    The second major objection raised by critics argues that hypnosis’ ability to blunt pain results from either simple relaxation or a placebo response. McGlashan established that while hypnosis was only as effective in reducing pain as a sugar pill for poorly hypnotizable people,highly hypnotizable subjects benefited three times more from hypnosis than from the placebo. In response to these successes,Rainville devised experiments to determine which brain structures are involved in pain relief during hypnosis,attempting to locate the brain structures associated with the suffering component of pain,as distinct from its sensory aspects. Using PET, he and other scientists found that hypnosis reduced the activity of the anterior cingulate cortex—an area known to be involved in pain—but did not affect the activity of the somatosensory cortex, where the sensations of pain are processed.
    Despite the value of these findings,the mechanisms underlying hypnotic pain relief are still poorly understood. The model favored by most researchers is that the analgesic effect of hypnosis occurs in higher brain centers than those involved in registering the painful sensation, accounting for the fact that most autonomic responses that routinely accompany pain—such as increased heart rate—are relatively unaffected by hypnotic suggestions of analgesia.
The research described in the passage is primarily concerned with answering which of the following questions?
选项 A、What research guarantees the reality of the effects that hypnosis has on brain activity, and what is their causal mechanism?
B、How are experiments devoted to disproving the "vivid imagination"objection to hypnosis different from those devoted to disproving the"placebo effecfthesis?
C、How can researchers reproduce the useful effects of hypnosis in a medical setting?
D、What technical advances have permitted researchers to reject skeptical explanations of the phenomenon of hypnosis?
答案C
解析 内容理解题。问的是文章主要回答了那些问题。根据原文，第二段讲了催眠对大脑活动作用；第三段讲了催眠止痛的大脑机制问题。所以正确答案是C选项。
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