What is the primary difference between the 'ill' and 'drunk' victim conditions in terms of help received?

The 'ill' victim (carrying a cane) received spontaneous help in nearly 95% of trials, usually within seconds. In contrast, the 'drunk' victim received help in only about 50% of trials and experienced a significant delay before intervention.

How did the results of Piliavin's study compare to the 'diffusion of responsibility' theory?

The study contradicted the theory; it found no evidence of diffusion of responsibility. In fact, help was slightly faster in larger groups, suggesting that in a confined space, the presence of others does not inhibit action.

How does a field experiment differ from a laboratory experiment in the context of bystander studies?

Field experiments take place in natural settings (like a subway) where participants are unaware they are in a study, leading to more authentic behavior. Laboratory experiments offer more control but may suffer from 'demand characteristics' where participants guess the study's aim.

What is a common mistake when describing the effect of group size in the subway study?

Students often incorrectly state that larger groups were slower to help (diffusion of responsibility). In reality, Piliavin found that the speed of help actually increased with group size in this specific environment.

Why is it incorrect to say that race was the most significant factor in helping behavior in this study?

While there was a slight tendency toward same-race helping in the 'drunk' condition, the victim's condition (ill vs. drunk) was a much more powerful predictor of whether help would be offered.

What ethical error is most frequently cited regarding Piliavin's methodology?

The lack of informed consent and the inability of participants to withdraw are major concerns. Bystanders were subjected to a stressful situation without their knowledge and could not 'leave' the experiment because they were on a moving train.

Define 'Arousal' within the context of the Cost-Reward Model.

Arousal refers to the unpleasant physiological and emotional state (tension, anxiety, or sympathy) triggered in a bystander when they witness a victim in distress.

What is meant by the 'Cost of Helping'?

It refers to the potential negative outcomes for the bystander if they intervene, such as physical harm, social embarrassment, effort, or being late to a destination.

Define 'Ecological Validity'.

It is the degree to which the behaviors observed in a study reflect behavior in real-life settings. Piliavin's study has high ecological validity because it used a real subway and real passengers.

What was the 'Model' condition in the study?

A confederate who was instructed to intervene and help the victim if no one else had done so after a specific amount of time (either 70 or 150 seconds) to see if this encouraged others.

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Piliavin's Subway Study

Summary

Piliavin's Subway Study (1969) is a landmark field experiment in social psychology that investigated bystander behavior in a naturalistic setting. It challenged the prevailing 'diffusion of responsibility' theory by demonstrating that in certain high-stakes environments, group size does not inhibit helping behavior, and proposed the 'Cost-Reward Model' to explain why individuals choose to intervene or remain passive during emergencies.

1. Definition & Core Concepts

Bystander Intervention: The phenomenon where individuals observe an emergency and must decide whether to provide assistance to a victim.
Field Experiment: A research method where the independent variables are manipulated in a natural, real-world environment (like a subway) rather than a controlled laboratory.
Ecological Validity: The extent to which research findings can be generalized to real-life settings; this study is noted for its high ecological validity due to the authentic environment and unscripted nature of the participants' reactions.
Diffusion of Responsibility: A socio-psychological theory suggesting that individuals are less likely to take action when others are present, as the perceived burden of responsibility is shared among the group.

2. Underlying Principles: The Cost-Reward Model

Arousal State: Observing an emergency creates an unpleasant state of emotional arousal (tension or fear) in the bystander, which they are motivated to reduce.
Cost of Helping: The perceived negative consequences of intervening, such as physical effort, potential danger, embarrassment, or time loss.
Cost of Not Helping: The negative consequences of ignoring the situation, including self-blame, public censure, or continued emotional distress from seeing the victim suffer.
Reward Analysis: The positive outcomes of helping (e.g., praise, self-satisfaction) or not helping (e.g., continuing one's journey uninterrupted).
Decision Rule: Bystanders will choose the response that most rapidly and completely reduces their arousal while incurring the lowest total cost.

Flowchart of the Arousal: Cost-Reward Model showing how perceived costs lead to helping or non-helping behavior.

3. Methods & Techniques

4. Key Distinctions

5. Exam Strategy & Tips

6. Common Pitfalls & Misconceptions