Answer:
The bystander effect
Explanation:
The bystander effect is the phenomena that are proposed by Darley and Latane. This is the famous term in social psychology. The bystander effect occurs when people are less likely to help a person in need because of the presence of other eyewitnesses.
People take more action when there are no eyewitnesses. The number of eyewitnesses will decrease the responsibility to help a person who is in need.
Thus Mr. Hugh heard reaction illustrate the term bystander effect.