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  3. By 1950. the results of attempts to relate brain processes to mental experi

By 1950. the results of attempts to relate brain processes to mental experi

游客2023-11-19  34
问题      By 1950. the results of attempts to relate brain processes to mental experience appeared rather discouraging. Such variations in size, shape, chemistry, conduction speed, excitation threshold, and the like as had been demonstrated in nerve cells remained negligible in significance for any possible correlation with the manifold dimensions of mental experience.
      Near the turn of the century, it had been suggested by Hering that different modes of sensation, such as pain, taste, and color, might be correlated with the discharge of specific kinds of nervous energy. However, subsequently developed methods of recording and analyzing nerve potentials failed to reveal any such qualitative diversity. It was possible to demonstrate by other methods refined structural differences among neuron types: however, proof was lacking that the quality of the impulse or its conduction was influenced by these differences, which seemed instead to influence the developmental patterning of the neural circuits. Although qualitative variance among nerve energies was never rigidly disproved, the doctrine was generally abandoned in favor of the opposing view, namely, that nerve impulses were essentially homogeneous in quality and were transmitted as "common currency" throughout the nervous system. According to his theory, it is not the quality of the sensory nerve impulses that determines the diverse conscious sensations they produce, but rather the different areas of the brain into which they discharge, and there is some evidence for this view. In one experiment, when an electric stimulus was applied to a given sensory field of the cerebral cortex of a conscious human subject, it produced a sensation of the appropriate modality for that particular locus, that is, a visual sensation from the visual cortex, an auditory sensation from the auditory cortex, and so on. Other experiments revealed slight variations in the size, number, arrangement, and interconnection of the nerve cells, but as far as psychoneural correlations were concerned, the obvious similarities of these sensory fields to each other seemed much more remarkable than any of the minute differences.
      However, cortical locus, in itself, turned out to have little explanatory value. Studies showed that sensations as diverse as those of red, black, green, and white, or touch, cold, warmth, movement, pain, cortical areas. What seemed to remain was some kind of differential patterning effects in the brain excitation: it is the difference in the central distribution of impulses that counts. In short, brain theory suggested a correlation between mental experience and the activity of relatively homogeneous nerve cell units conducting essentially homogeneous impulses through homogeneous cerebral tissue. To match the multiple dimensions of mental experience psychologists could only point to a limitless variation in the spatiotemporal patterning of nerve impulses. [br] The description of the experiment in which electric stimuli were applied to different sensory fields of the cerebral cortex tends to support the theory that ______.
选项 A、different modes of sensation might be correlated with the discharge of specific kinds of nervous energy
B、nerve cell units conduct essentially homogeneous impulses through homogeneous cerebral tissue
C、the mental experiences produced by sensory nerve impulses are determined by the cortical area activated
D、quality of the impulse or its conduction was influenced by the different modes of sensation
答案 C
解析 推理题。本题问对电流刺激被应用到脑皮层的不同感觉部位的实验的描述支持了什么理论。文章说："According to this theory，it’s not the quality…but rather the different areas of the brain…”即根据这一理论，不是感觉神经脉冲本身，而是感觉神经脉冲进入大脑的不同区域决定它们生成的各种感觉意识，并且有证据说明这一观点，接着文章就提到了题干所说的实验，所以这一实验是为了支持这一理论：由感觉神经脉冲所产生的大脑经历是由被激发的皮层区域
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