When I was a kid, I couldn't for the life of me figure out how my parents knew which way to operate the turn signals. It was to me unintuitive as the lever was

When I was a kid, I couldn't for the life of me figure out how my parents knew which way to operate the turn signals. It was to me unintuitive as the lever was operated up/down whereas the turn lights were right/left, and as on the car we had back then (a Saab 96, IIRC) the instrument panel had only a single blinking light for when either turn signal was enabled, instead of separate left and right turn signal lights. But yeah, IIRC there has been research suggesting that cognitive load on aircraft pilots in old-fashioned aircraft (lots of separate switches and gauges) is lower than in modern aircraft with touchscreens.