Problems of the Soul (Arguments from Physics)

The soul theory’s contradiction with neuroscience isn’t the end to its implausibility; it’s strongly at odds with modern physics as well. While neuroscience may be a more subjective field, physics is certainly not, and here I shall present problems that the soul theory faces according to physics (some of my arguments are directed specifically at ghosts aka wandering souls).

The 1st Law of Thermodynamics

The 1st Law of Thermodynamics, which is the principle of conservation of energy states that the overall energy within a closed system will remain constant, although it may be converted into other forms. For its energy level to change, it must come into contact with another system. In such a case, the energy level of the system will increase if work is done onto the system, and vice versa. As far as evidence goes, the Universe is a closed system.

Here comes the problem. For the soul to be able to do work in the material world, some of the soul’s energy must be converted into physical energy. Since the soul exists independently of the physical universe, the total energy in the universe will increase when the soul does work, and this must mean that the universe is an open system, which is contradictory to modern science.

Another saying that I’ve heard from my friends is that instead of existing in a separate realm, the soul enters the physical world when one is born (or during fertilization, gastrulation etc.). Somehow, the soul can affect physical entities, but not the other way around. This hypothesis doesn’t make sense, as they’re implying that the energy that makes up the soul is limited, and being unable to receive energy from the physical universe, it will use up its energy quickly and cease to exist.

Light

For us to see something, then that thing must either reflect or emit visible light. Ghosts are supposedly visible in quite some anecdotes, but that’s not possible if we’re to follow the usual definition for ghosts. Let me explain.

First of all, a ghost shouldn’t be able to reflect light. For light to be reflected, it must hit a surface. Since the soul is defined as being made up of only energy, there’s no way it can reflect light, and if I’m not wrong, all forms of light emission require matter as a source of fuel. Thus, for us to see ghosts, they must be made up of matter (at least partially). However, as the soul is supposed to survive physical and material death, such a definition is self-contradicting.

Gravity

In every single anecdote that my friends gave me, ghosts have the ability to float. This, however, simply contradictory to most widely established model for gravity – general relativity. Unlike previous models, general relativity describes gravity not as a force, but as a curvature of space-time, and everything in this universe is subject to the effects of gravity – matter, light, electromagnetic waves, energies etc.

If the souls exist within the material plane, then it must be subject to the gravity as well, no matter what it’s made of. No matter what universe you’re in, you’re going to subject to it’s time-space constraints. It’s logically contradictory for a ghost to float and not be affected by gravity. If a ghost is to float, then it must exert force against the centre of gravity. Such an act would require massive amounts of energy, and the soul would quickly cease to exist. Unless the 1st law of thermodynamics is violated, of course.

And by the way, if ghosts are free from gravity, they should be hurtling into space.

Conclusion

Here I have put forward a few points showing that the concept of the soul is quite problematic from the viewpoint of modern physics. It’s a wonder that mind-body dualists can still insist that the soul theory is true even when it contradicts one of the most objective fields of science.

Of course, the list is far from complete, and I would be thankful if anyone can come up with even more ideas showing how the soul contradicts physics.

Problems of the Soul (Arguments from Neuroscience)

The concept of the human soul and life after death is almost universally accepted among the people. One may not accept the existence of gods, deities, or ghosts, but if asked on the validity of souls and spirits, he/she is most likely to answer yes. Yet, to the naturalist, such a concept is very problematic, and being a naturalist myself, I’ll give a few thoughts on why the concept of the soul contradicts neuroscience, and is thus highly implausible.

René Descartes's illustration of dualism. Inputs are passed on by the sensory organs to the epiphysis in the brain and from there to the immaterial spirit.

Neural Development

The soul is eternal, and it controls our body, as mind-body dualists love to claim. Consciousness is retained even after we die, and is passed on to our next body (whether it’s a human, animal, fairy, ghost, demon). But neural development challenges this belief strongly.

Maturing of the Mind

The mind matures as the brain grows, as shown in this picture where our brain achieves full grey matter volume during our 20s.

As we all know, when humans grow up, our thoughts start to mature, and begins to decline once we reach an old age. To the biologist/naturalist, the explanation for such a phenomena couldn’t be simpler: neural development. As we grow towards the adult stage, our brain starts to increase in complexity and amount of grey matter. Then, as we start ageing, our brain begins deteriorating, through a multitude of factors including DNA damage and free radicals damage.

A dualist, however, will find this problematic. If the soul retains our consciousness and thoughts after we die, then one should be reborn with similar thoughts from the previous life. But that’s certainly not the case, as we’re born with almost nothing in our memory, and we don’t act maturely at all until we’re older.

The Beginning of Consciousness

I put forward a simple question to all mind-body dualists: In which stage does the soul enter the body?

Theistic evolutionists face a very problematic question: When did God decide to insert the soul into the human body in the passage of evolution? During the point where Australopithecus lived? Homo hablis? Homo erectus? Homo sapiens? Theistic evolutionists have a hard time agreeing on the exact point. The same problem is there for mind-body dualists. When does the soul enter the body? During the moment of conception? Gastrulation? When we become an embryo? Perhaps the moment of birth? Dualists will have a hard time agreeing on this. While this isn’t a rebuttal to the soul theory, it does present a problem in the soul theory.

The Nervous System

It’s widely accepted to any student of science that our senses are controlled by our nervous system, which sends information to our brain through electrical charges, and our brain will respond accordingly. Such a model doesn’t fit well with the soul theory.

Our Senses

Here’s the 5 traditional senses. Obviously, all of them stop working once the specific nerves get damaged.

If the soul is to retain full consciousness in the material world after death, then it must be independent of our nervous system. The soul must be able to receive information from the material world through another method, if it’s to work as dualists claim. Such is not the case. When a person’s optical nerves get damaged, he/she loses his sight; when his/her auditory nerves stop functioning, he/she becomes deaf etc. It’s very clear that our interaction with the environment is reliant on the nervous system. So either the soul loses all connection with material world once we die, or the soul somehow regains full consciousness the moment we pass away. The first hypothesis requires a radical change in the soul theory; the second hypothesis is simply laughable.

Brain Damage

If the soul is responsible for our consciousness, then why does patients with brain damage suffer from reduced mental abilities?  In fact, neuroscientists are capable of predicting damage in which part of the brain will cause what kind of mental deterioration. The fact that mental abilities are subject to the state of the brain is at odds with common dualist anecdotes which claim that the soul can leave the body, or that the soul can keep on having thoughts in the material world after death.

Conclusion

In this post, I have raised a number of problems that challenge the soul theory greatly. The phenomena above points strongly to the view that the mind and consciousness is the product of the brain, not the soul. Before any dualist manages to explain away those problems, I’m a naturalist. But I’ve only pointed the problems from the neuroscientist’s view. In my next post, I’ll point out why the soul is completely implausible from a physics point of view.

PS: If my anyone finds any logical or philosophical errors in my opinions, please tell me. :-)