How could people possibly be this bad at drawing a bicycle!? Was this study done on aboriginals living in a rainforest that have never gone to a paved part of

How could people possibly be this bad at drawing a bicycle!? Was this study done on aboriginals living in a rainforest that have never gone to a paved part of the world where people use bicycles? Sure, I'd get a bit flustered if asked to draw a modern mountain bike with rear suspension. Err... there's a spring back there... somewhere? But an ordinary road bike? How could you get that wrong?