When I was in primary school (year 5 or 6) I struck upon the idea that humans could have variable perceptions. My friend, Charlie, had colour blindness, I did not know what this meant and assumed after a cursory explanation that he mistook red for green and green for red. Being a relatively inquisitive kid I struck upon a problem immediately and could not work out how he’d ever know he was colour blind.
It wasn’t until later that day I was informed as to how colour blindness works. Still, I felt incredibly clever for several years until I was informed that the problem had been thought of before, I thought I had encountered a true wonder of the human mind for the first time and to me it was a pretty big high especially considering my age.
If you do not have sight of your quarry but you suspect it to be in the area then you’ll probably freeze. Animals, humans included, are excellent at spotting motion. Of course, both of our ideas are essentially baseless, I think we’d have a clearer picture if someone performed Eliezer’s study (or similar).