Let’s assume that Dr. Sagan’s beliefs about mind and thought are true. Thoughts are, he thinks, “hundreds of electrochemical impulses” in the brain. What follows from this? First, error is impossible. One electrochemical impulse is as good as another. The chemistry in the brain of someone who thinks that behaviorism is false is as perfect as the chemistry in the brain of someone who thinks that behavior ism is true. If thoughts are electrochemical, then one thought, one chemical reaction, is as good as another. Why Sagan insists that his chemical reactions are right and mine are wrong is a complete mystery. “Wrong” has no meaning on behaviorist premises.
It follows from the meaninglessness of error that behaviorists, in this case Dr. Sagan, cannot claim their assertions are true. Behaviorism makes truth equally meaningless. Truth is not a quality of electrochemical impulses. My rejection of behaviorism, that is, in Dr. Sagan’s terms, the electrochemical impulses in my brain, are chemically as good as his. Chemicals never err. Both his reactions and mine are solid chemistry. Both obey the inviolable laws of chemistry, which, Dr. Sagan has told us, are the same every where in the universe. Now if anyone, no matter how highly respected and decorated, proposes a theory that precludes the truth of the theory he proposes, he is involved in a hopeless contradiction and needs no further refutation. If he persists in asserting what cannot be true, he needs close and compassionate attention, rather than disputation.
The situation is, however, somewhat worse than this initial consideration indicates. Not only does behaviorism eliminate truth, it eliminates memory and communication as well. If thoughts are electrochemical impulses, then they are specific datable events in the brain. They cannot be repeated. They occur and then they stop. Memory is impossible. A behaviorist might reply that we can have a similar thought later, that is, a similar electrochemical impulse can occur. But the behaviorist forgets (and hopes that we will forget as well) that according to behaviorism the thought of similarity is still another and still later electrochemical impulse, another dated event separated by time (and perhaps by space) from the first two chemical reactions. How can still a third electrochemical reaction connect the first two, which have already occurred and ended? How can a behaviorist tell whether two ideas are similar, if ideas are electrochemical impulses? Behaviorism makes comparison and memory impossible.
It also makes communication impossible. Carl Sagan’s mind is a bundle of electrochemical impulses and reactions; and so is mine, according to Carl Sagan. Dr. Sagan has a thought, that is, his intracranial chemicals react in a certain way. But his brain’s electrochemical impulses cannot be my brain’s electrochemical impulses, any more than his toothache can be mine or my toothache his. Therefore, I can never know his thought. It is therefore impossible to tell what Dr. Sagan means by any of the thousands of propositions that he has written in his books and articles. And since behaviorism also destroys memory, Dr. Sagan himself has no idea what he wrote either. Perhaps his books mean nothing at all. Perhaps they are simply the debris left by a powerful and sudden electrochemical brainstorm.
Behaviorism has been around for centuries, but the modern revival of some forms of Greek paganism has made it into one of the major superstitions of the twentieth century. Ernest Nagel, in his presidential address that I quoted above, said that it is one of the best-tested conclusions of experience. Gordon Clark has suggested that behaviorism be subjected to the same sort of test that other theories claiming to be scientific undergo. Einstein’s general theory of relativity predicted several events, such as the precession of the perihelion of Mercury and the deflection of starlight in the presence of large masses. Scientists could observe whether those events occurred as implied by Einstein’s theory. Let Dr. Sagan specify which electrochemical impulses in the brain are the thought “the Earth is 4.6 billion years old.” Let him tell us what the specific chemistry of astronomy, as distinguished from astrology, is. Let him specify how the surge of electrochemical impulses meaning “The opening chapters of the book of Genesis are mythological” differs from the spurt of electrochemical impulses meaning “The Bible alone, and the Bible in its entirety, is the word of God written and therefore inerrant in the autographs.” Let us see what empirical basis there is for the claim that thoughts are electrochemical impulses. I certainly hope Dr. Sagan’s brain is up to the task.