There is no muscle in the brain. It has no function other than communication. It is composed entirely of nerves. And that is all that nerves do: they communicate. It is common knowledge that this communication done through electrical signals.
By definition, this communication must is in a language or code. And that code is non-physical logic.
Electrical signals travel through your optic nerve carrying information that describes what you are seeing. There are 16,000,000 just on a computer monitor - and there is a code for every one of them, or else they could not be seen. Signals travel through your olfactory nerve carrying information about what you are smelling and it is all in non-physical, purely logical code. Coded electrical signals traverse billions of neurons for the purpose of creating thought and reason.
One set of signals may communicate that you are smelling wood smoke, another communicates that you are smelling burning rubber. The same is true for your eyes. Certain signals mean blue while others communicate the color red with a slight overtone of maroon. All of these perceptions are nothing more than electrical signals sent along nerves from the sensory organ.
There is one set of signals for colors, another for sounds, another for touch, another for smell, another for sight or for reason or emotion, others for other intrabrain communications and others for the operation of your body. These signals are codes and these codes have never been deciphered.
These codes are so complex and so beautifully designed that they accurately convey every color that you have ever seen in the form of electrical impulses, and every smell that you have ever smelled, every touch that you have ever experienced and every thought and emotion that you have ever had.
These codes are entirely non-physical; they are pure logic.
Each one of billions of nerve cells creates the precise amount of electricity that it uses to transfer its particular code. The nerve cells create the electrical signals that they use by sending sodium and potassium ions in and out of the cell wall at rates varying up to 1000 changes per second. In 1/1000 of a second, the cell changes from a negative charge to a positive charge and then back again. In this way, nerve cells "hum" with electricity.
It is in the pattern and the speed of the hum that the brain transfers data and creates thought. This is the way that brain cells communicate - by codes conveyed through electrical signals that have no physical resemblance whatever to that which they convey. Every sight, sound, touch, emotion, reaction, every memory and every thought in the history of mankind is a code.
If these nerve cells occurred by chance, then billions of cells have, by accidental mutations, were somehow arranged and organized be able as a whole to assimilate and to apply the non-physical codes. Each cell was, by accident, assigned a duty and purpose in the context of all of the billions of others. And how many different encoded expressions are there in vision? There is at least one for every color that man can see. And man can see millions of colors.
It is insufficient to explain this by saying that millions or hypothesized accidents just happened to accurately organize the cells in a brain and create and incorporate all of the numerous complex logical codes that are used by the unknown number of networks and sub-networks in the human brain. The argument is ludicrous. The argument is logical if and only if one presumes that there is no Designer. And the presumption of no Designer is a theological premise, not a scientific one.