21世纪，英语已经走进了我们每个人的生活，学好英语成了我们共同的目标，为了帮助大学生更好地掌握英语，特提供以下文章：
The Relationship between Brain Process with Mental Experience
By 1950, the results of attempts to relate brain processesto mental experience appeared rather discouraging. Suchvariations in size, shape, chemistry, conduction speed, excitationthreshold, and the like as had been demonstrated in nerve cellsremained negligible in significance for any possible correlationwith 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 nervousenergy, However, subsequently developed methods of recording and analyzing nerve potentialsfailed to reveal any such qualitative diversity. It was possible to demonstrate by other methodsrefined structural differences among neuron types; however, proof was lacking that the quality ofthe impulse or its conduction was influenced by these differences, which seemed instead toinfluence the developmental patterning of the neural circuits. Although qualitative variance amongnerve rigidly disproved, the doctrine was generally abandoned in favor of the opposing view,namely, that nerve impulses are essentially homogeneous in quality and are transmitted as“common currency” throughout the nervous system. According to this theory, it is not the qualityof 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 evidencefor this view. In one experiment, when an electric stimulus was applied to a given sensory field ofthe cerebral cortex of a conscious human subject, it produced a sensation of the appropriatemodality for that particular locus, that is, a visual sensation from the visual cortex, an auditorysensation from the auditory cortex, and so on. Other experiments revealed slight variations in thesize, number, arrangement, and interconnection of the nerve cells, but as for as psychoneuralcorrelations were concerned, the obvious similarities of these sensory fields to each other seemedmuch more remarkable than any of the minute differences.
However, cortical as diverse as those of red, black, green and white, or touch, cold, warmth,movement, pain, posture and pressure apparently may arise through activation of the samecortical areas. What seemed to remain was some kind of differential patterning effects in the brainexcitation: it is the difference in the central distribution of impulses that counts. In short, Braintheory suggested a correlation between mental experience and the activity of relativelyhomogenous nerve-cell units conducting essentially homogeneous impulses throughhomogeneous cerebral tissue. To match the multiple dimensions of mental experiencepsychologists could only point to a limitless variation in the spatiotemporal patterning of nerveimpulses.