Barfield’s second blow forced the issue of the meaning of “mind.” If Lewis were determined to keep clinging to realism, then he had to accept that “thought” itself, as a product of cumulative and inherited input from the five senses, was a relatively new phenomenon in the universe, since it came with the advent of humans. Lewis would also thus need to embrace the Theory of Behaviorism, which insisted that there is no such thing as “mind” at all, only behavior, since behavior, not mind, could be measured and studied. The concept of “mind” had no proof, but actions did. Of behaviorism, Lewis
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