The flight simulator was one source of Subliminal Distraction exposure that would have caused a mental break leading the captain to hijack the plane during a psychotic episode.
That three screen arrangement supplies threat-movement in peripheral vision to cause subliminal failed attempts to execute the vision startle reflex.That process is defined as a visual subliminal distraction.
There had to be more than one source since others have similar simulators in homes without known problems.
There are no pictures, so far, of his home computer. That might be a second source of exposure if it was located where family could walk by as he used it.
If he did things like read books while sitting in the pilots position on long flights, he would have subliminally detected the co-pilots movements for exposure too.
Subliminal Distraction, named for the normal feature of our physiology of sight that allows it to cause mental breaks, is explained in first semester college psychology lectures about peripheral vision reflexes.
The problem was discovered in 1964 because it caused mental breaks for office workers. The cubicle was designed to block peripheral vision for a concentrating knowledge workers to stop it in offices by 1968.
Everyone aware of it believes it only happens in offices and causes a harmless temporary episode.
VisionAndPsychosis_Net is a 12 year investigation of it.