I was thinking about post-traumatic stress disorder (PTSD) and I realized that the PTDS patients don't visualize, feel and re-experience traumatic situations and feelings out of nowhere. They often need a stimulus to be reminded about the specific situation. The stimulus could be a sound, a smell, a situation, or a complex mix of various factors.
What if we could use this mechanism of "stimulated memory come back" to learn and memorize loads of information and have them available when specific stimuli are applied?
For example, on every slide of the human anatomy presentation, there is a different visual or audio signature. It could be even specific ultrasound or another neuro stimulus. The sign provokes the non-harmful mini-stress, which activates the brain in a way similar to PTSD trauma and the slide gets "stuck" in your brain, while the signature gets remembered by your phone/electronic device (inlcuding keywords). The moment when you want to remember what was on the slide, you replay the specific signature via a keyword and the memory comes back like you lived through it just a minute ago!