Explain how the setting of the subway carriage in the study by Piliavin et al. (Subway Samaritan) may have led to a breach of the ethical guideline of protecting participants from psychological harm.
105 exam-style questions on OCR A Level Psychology Responses to people in need, covering Piliavin et al. (1969): Subway Samaritan and Levine et al. (2001): Cross-cultural altruism. Each one has a worked solution and a mark scheme showing where the marks go.