A professor had us replicate this effect in college. We broke up into pairs and one person put on a blindfold while the other person let them around campus. A

A professor had us replicate this effect in college. We broke up into pairs and one person put on a blindfold while the other person let them around campus. After about 5 minutes the person being blindfolded could hear people, conversations, cars, etc. far sooner than their partner.