You wrote, "like to hear from at least one person who is going for or completed their Ph.D on this forum."
No that is not me.
But I might add a couple points that may be of interest. I suffered a massive stroke about 3 1/2 years ago. It affected several areas deep inside my brain. After the stroke, I lost by ability to read. I stared at words and they broke apart right before my eyes. Not only that but the letters also broke into pieces and became an entirely different alphabet system, one that I could not read. If that wasn't bad enough, I also lost my knowledge of almost all spoken words.
One of the conditions I developed is called aphasia and I suffered one of the most severe forms. Bruce Willis recently suffered a similar condition. It is really difficult to recover from such a condition. It takes a significant amount of mental work.
One point to make is that even though I lost my ability to read, I did not lose my ability to write. I wrote myself a very detailed description of what happened to me from the stoke, but I could not even read what I had written. I stumbled across the paper 6 months later after I made some recovery.
Probably another point to make is that humans have multiple brains. One exist on the left side of our skull and the other on the right side. There is a little connecting tissue that combines these two sides together. These two brains are very different brains. As we evolve from childhood to adulthood, one becomes our daytime brain. The other brain exists in our sleep, in REM and deep NREM sleep. Humans are much more complex then anyone really understands.
There is one interesting book that might provide some insight. It is called "Whole Brain Living" by Jill Bolte Taylor, Ph,D. This was her second book. Her first one is also worth a read. It describes the effect of her massive stroke when she was around 35 years old in very fine and intricate detail.