Clark and Word studied the role of ambiguity in promoting this phenomenon. 
Clark and Word studied the role of ambiguity in promoting this phenomenon. One study of this phenomenon involved a woman saying she could not move her foot, played tapes of choking from amidst cubicles, and slowly pumped smoke into a room where surveys were being completed. It was first studied to explain why Winston Moseley was able to return twice over a thirty-five minute period despite (*) thirty-eight witnesses. Similar to pluralistic ignorance, it was explained in Latane and Darley's paper "Why Don't People Help?" For 10 points, name this phenomenon in which an increase in the number of witnesses to an emergency decreases the likelihood of any one person acting, often used to explain the murder of Kitty Genovese.
Clark and Word studied the role of ambiguity in promoting this phenomenon.
the {bystander effect} [accept {pluralistic ignorance} before it is mentioned]