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, posture, and pressure apparently may arise through activation of the same 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.
21. The author suggests that, by 1950, attempts to correlate mental experience with brain processes would probably have been viewed with
indignation
impatience
pessimism
indifference
defiance
22. The author mentions common currency in line 26 primarily in order to emphasize the
lack of differentiation among nerve impulses in human beings
similarity of the sensations that all human beings experience
similarities in the views of scientists who have studied the human nervous system
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