That would also be true of the 3 to 5 week old fetus you described. It cannot be proved that it has awareness or consciousness or thought of any kind.
Seriously? You are aware, aren't you, that it is possible to measure brain activity? That it is possible to measure the function of a single cell? Also--you are probably unaware of this--when cells differentiate into tissues, they take on the function of those tissues. There is no such thing as an inactive differentiated cell. When cells differentiate to become brain tissue, they function as brain tissue.
Not every living person's brain as the example of my mother with Alzheimer's addressed. But I don't think brain waves have ever been detected in a five week old fetus. If it has it is still irrelevant. Not all living beings have brains so it isn't a defining characteristic of a living being.
Your mother with Alzheimer's may have diminished brain function, but she is still a human being and will remain so until she dies. And so what if alpha, beta, theta waves have or have not been detected in a 5 week old embryo? That is irrelevant. As I pointed out in my previous posts, as soon as the cells differentiate, they take on the function of their differentiated form. So brain cells act like brain cells. It is irrelevant whether they coordinate in such a fashion as to produce brain waves at 5 weeks--as they continue to grow, they will learn to work together to make the brain waves.
You really are all over the place. On the one hand, you try to elevate a tiny clump of cells--a number of cells vastly outnumbered by the cells you kill if you get a tiny scratch--to the status of a thinking, feeling human being. Then you turn around and try to argue that there is no way to prove that an observably feeling, aware human being is actually feeling and aware. Your inconsistency makes me think you are a troll.
Yet many living beings don’t even have brains. Nor can you determine that brain waves signify thoughts are happening or that perception is occurring. As in a coma patient. Your ever-shifting esoteric bases for defining a ‘living being’ fails repeatedly.