Once again, this proves that ADD/ADHD are not so much about the brain speed as they are about poor equilibrium between left and right brain hemispheres with regards to their dominance, functions, speed, efficiency, and intensity of performance.
Most ADD/ADHD symptoms come from poor performance of the left brain.
PTSD symptoms come directly from the right brain. The more the right hemisphere is out of balance with the left, the more prominent will be the symptoms of PTSD.
PTSD are emotions constantly kept on the foreground via memory recalls. Memories of violence, horror, injustice, physical pains, emotional pains get stuck in the mind. They are persistent, unstoppable, invading, intruding into our all hours of our lives. The only way to keep them in check is to train the brain, both left and right, to work in equilibrium.
Google "nestoiter what is vestibular stimulation" and "nestoiter Hidden Powers of Tightrope: Balance Training". No pill can create the conditions that would train left and right hemispheres to work with the same intensity, but a simple balance beam will.