To which two processes do some social psychologists attribute the phenomenon of people not helping someone they do not know?

Question

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The bystander effect is the tendency for individuals to be less likely to offer help in an emergency situation when other people are present. Diffusion of responsibility is the belief that responsibility for taking action is spread across all individuals present, leading to decreased likelihood of any individual taking action. These two processes have been linked to the phenomenon of people not helping someone they do not know.

To Which Two Processes Do Some Social Psychologists Attribute the Phenomenon