Another thing known for many decades, is that within 30 seconds or so of looking at a TV screen, even a blank one (by anyone who habitually watches), the watcher has gone into a light trance.  This means a person's critical thinking 'censor' is disabled, and they are rendered highly suggestible to 'programming'. This isn't just from habit, it's actually induced by the flickering light shining into a viewer's eyes. Also if there are diverse sensory channel inputs in the onscreen content (sound effects, text, images, speaking, lines of words scrolling around, etc. vs. coherent content), that also readily induces a hypnotic state, akin to a process known to clinical hypnotism as 'Erickson's Confusion Technique.'  The messages 'compete' in the brain, in effect disarming a person's mind.