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This is a logically valid argument. The conclusion follows from the premises by the rule of modus ponens. In order for the conclusion to be justifiably reached, we must affirm that both premises are true. What reasons can be given in defense of these premises?

The premise rests on the law of identity. The physicalist (i.e the person who believes that people don’t have souls) must prove that when one is talking about the “brain” and when one is talking about the “mind”, they are talking about the same object. In order for them to really be one in the same, any property that the brain has, the mind must have. Any property the mind has, the brain must have. If physicalism is true, the brain must have properties A, B, C, D, E, F, G, and the mind must have properties A, B, C, D, E, F, G. Moreover, there must be no property or properties, H, I, and/or J which exists in one but not in the other. For if properties H or I can be found in one but not in the other, then this shows that they are different entities.

Imagine an alien were to visit from a faraway galaxy and he asked an Earthling who the current president of the united states is. The Earthling tells the alien that the current president is the former host of the TV show The Apprentice. Furthermore, this Earthling later learns from another person that The Apprentice only had one host prior to Arnold Schwarzenegger, Donald Trump. So, if the current president is the former host of The Apprentice, and the former host of The Apprentice is Donald Trump, then the alien would rightly conclude that the name of the current President is Donald Trump. He also learns that Trump is a Caucasian man and that it was a Caucasian man who previously hosted the television show.

In the above illustration, the alien never actually saw pictures or videos of both of these U.S Presidents. He simply logically inferred based on the law of identity that Donald Trump was the president during his first visit, but that someone else became president before his second visit.

E, F, and G, are incompatible with  A, C, and D. On this basis, the alien concludes they aren’t the same person. They do not have 100% of their properties in common.

Or another illustration: suppose your wife called you on the phone and said that she bought a bag of red fruit and set them on the counter. You come home to find red apples sitting on the table. You infer that the apples were the fruit your wife was referring to because (A) apple is a fruit, and (B) the apples are red. Your wife’s description and your observation connect to tell you that what your wife was talking about on the phone and what you’re now seeing with your own eyes are one in the same thing. Now, if you came home and found Granny Smith apples, you would think something is up. Although apples are a type of fruit, there’s a property that distinguishes them from the fruit your wife described on the phone, namely the color. You would infer that either your wife was lying, she’s color blind, or she bought two kinds of fruit and the fruit you’re looking at isn’t the kind she was talking about on the phone. But you would never say that the fruit you’re looking at and the fruit your wife talked about on the phone are the same type of fruit because they do not share 100% of the same properties in common. There is at least one property to distinguish them.

It can be stated simply: If X is identical to Y, then whatever is true of X is true of Y and vice versa. But if something is true of Y that is not true of X, then X is not identical to Y.

The mind has mental properties, such as the property of feeling sad, happy, angry. The mind thinks “about” things. For example, when I go for walks with my dog, I think “about” God, Jesus, philosophy, science, apologetics, or how lovely the trees in my yard looks. Sometimes I think “about” my childhood. The mind has the property of “aboutness” to it. The mind also has the property of first-person perspective. I know myself more intimately than anyone else in the world. I know first-hand what it’s like to feel my own happiness, my own sadness, my own anger, my own anxiety. I know what it’s like to be me. Moreover, the mind contains these things called beliefs, and beliefs can be either true or false.

What about the brain, that physical organ that sits inside our skulls? Does the brain have these properties? No. The brain is never “about” anything. A neuroscientist could hook me up to a machine that could show in exact detail every physiological phenomenon that are going on inside my brain, and never once will he see any of my thoughts. I could be thinking about Pokemon Battle Strategies, and the neuroscientist wouldn’t be able to point to a group of neurons and tell his colleagues “You see that? Those neurons are about Pokemon Battle Strategies”. He would never be able to locate my knowledge of The Bible or of Natural Theology argument. The neuroscientist couldn’t put his finger on the screen of the machine and say “Here’s The Kalam Cosmological Argument!” Even if they cut open my brain and put every molecule under a microscope, they wouldn’t find any property of “aboutness” anywhere. But if the mind is the brain, and mind is undergoing various thoughts, one ought to be able to locate and discern those thoughts if they can simply know what physical processes are going on in my brain, right?

It is also impossible for someone studying a person’s brain to have that first-person perspective. He could have Bob hooked up to a machine to show all of the physical processes currently going on in his brain. The doctor could then hit Bob’s toe with a hammer. The machine would register a pain signal going from Bob’s foot to his brain, indicating that he is experiencing pain, and the doctor would rightly conclude that Bob is in pain. Nevertheless, the doctor would not know what it is like for Bob to experience that pain. He doesn’t have the first person perspective of the hammer pain. Now, one may object “But Bob could retaliate and hit the doctor on the foot”. True, but that would only result in the doctor having the first-person experience of his own pain. He still wouldn’t have first person knowledge of Bob’s pain. The doctor might infer that this is what it was like when he struck Bob. In fact, this seems obvious. We all seem to be able to empathize with someone who is going through physical pain. We say “I’ve been there” or “I know what that’s like”. But this is merely a logical inference linking two independent experiences. We don’t really know what it’s like for that person from their first person POV. We can only infer what it’s like for them on the basis of what it was like for us.

I can infer what it’s like for Bob to have a toothache on the basis of my own experience of tooth-aches, but I do not and cannot partake in Bob’s firsthand experience of tooth pain. The most advanced technology in the world could only tell you the physiological processes occurring when Bob experiences things, but it would never let you step into Bob’s shoes and have that experience yourself.

The Mind’s properties — (1) Aboutness, (2) first person POV, (3) has beliefs that are true or false.

Whatever properties they might have in common, it is indisputable that one has properties the other doesn’t have, thus the second premise is true.

Since both premises are true, the conclusion follows by the law of modus ponens.

The primary argument for physicalism is that whenever mental events occur in the mind, there are physical events happening in the brain that occur simultaneously. Take the phenomenon of fear. When you have fear, undoubtedly there is brain activity that is correlated with the experience of fear. Physicalists will also point out that certain mental diseases, like Alzheimer’s, affect the brain, but as a result of affecting the brain, the mind is also affected. People with this dreadful disease lose more and more of their ability to think clearly and remember. Eventually, they even forget who their relatives are. Doesn’t this loss of brain/loss of mind correlation show that the mind is the brain?

Secondly, this objection doesn’t even address my points that the mind has the property of aboutness and the brain does not (no neuron, cell, or electrical impulse is “about” any of your thoughts), nor it does address my point that even an exhaustive knowledge of the physical process of the brain wouldn’t show you that person’s first-person point of view. This objection refutes neither premise of the argument.

Thirdly, mental diseases like Alzheimer’s affecting one’s mental life doesn’t necessarily point to the conclusion that they are one in the same. At most, this just shows that the brain and mind can affect or influence one another. In a lecture at the Truth For A New Generation conference in 2012 titled “The Argument For The Soul”, J.P Moreland gave the following illustration. Suppose you’re in a car that has defected doors that won’t open, and the seatbelt can’t be released either. Wouldn’t it be the case that your mobility would be limited by where you can drive the car? Yes. You could go anywhere you wanted to except for places where the car couldn’t fit. Suppose something happened to the steering wheel that caused it to be stuck turned left. In this case, you’d be stuck driving around in circles.

In a similar way, while we’re stuck in these earthen vessels, we are mentally limited by our brains and bodies. If the brain is malfunctioning, that’s going to cause our minds to malfunction as well even though our minds are distinct. Now, when the mind (soul) leaves the body, it’s no longer constrained by the physical defects of the brain it depended on. Just as the physical defects of the car didn’t matter once our driver was able to get out.

So, to conclude: brain-state correlation with mental events doesn’t prove the mind is the brain. It could just mean there’s a two-way relationship of cause and effect between them. There’s a reason my blog’s slogan is “Using the brains that God gave us”. That reason is that I believe we do indeed use our physical brains to think, just a pianist uses a piano to make music.

Some physicalists try to argue that substance dualism is false because of what is known as “The Mind-Body Interaction Problem”. This dilemma stated is that there is no way to explain how an immaterial thing like the soul can cause effects in the brain and body and vice versa. How exactly does this mysterious substance called “The soul” cause effects in my physical brain? What mechanism is there for the soul to cause the brain to cause my fingers to type this sentence? No one can give an answer. I certainly can’t at least.

1: C.S Lewis, ChristianQuotes.com, Retrieved December 20th 2017, https://www.christianquotes.info/images/c-s-lewis-quote-soul/#axzz51p9eNMVl