I read an interesting Harvard study about perception. It's called "Prevalence-induced Concept Change", or simply "The Blue Dot Experiment'.
Participants were askes to sit in front of a computer monitor and watch as a colored dot would appear on the screen and then disappear. Then another dot would appear and disappear. The dots were either blue or purple, and the participant would simple have to click one of two buttons labeled "Blue" or "Not Blue".
They saw 1000 dots like this, and half were blue. Participants did very well distinguishing the blue dots from the not blue dots (purple). But then, with each additional 1000 dots, the researchers made it so fewer and fewer dots were blue. Each participant began labeling purple dots as blue.
They repeated the experiment using threatening and unthreatening faces instead of blue or purple dots. The same thing happened. Then they used ethical and unethical proposals. Participants would have to read sentence and click the appropriate label. Same results again.
This psychological studied showed that people become conditioned and develop a tendency to see what they expect to see. That's pretty remarkable.
A good example is how we're living today. By just about every measure of quality of life, freedom, equality, etc... we are doing better than at any other time throughout history. Yet so many people focus on the few bad things and overlook all the good things. And, according to the "blue dot" theory, we tend to see things that were never considered "bad" as now being bad. Conditioning has gotten us accustomed to seeking out bad things to point at or complain about, even when some of these things have never been considered bad.
Anyway, I wonder if seeing the perceptions for CTE users is related to the blue dot effect, where the user becomes conditioned to see a particular visual perception in a particular way. And expecting to see this visual a certain way allows them to actually perceive it as they want, and therefore align their body and stroke according to what they perceive. Just a thought.