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Bystander Intervention: Piliavin et al. (1969)

The Field Experiment Context

Introduction

Piliavin et al.’s 1969 study is a famous field experiment investigating bystander behaviour, specifically exploring the conditions under which people offer help in emergencies. It aimed to understand factors influencing helping behaviour in a natural environment rather than in a laboratory.

Study Objectives

1

Primary Aim

The primary aim was to explore bystander intervention in real-life emergencies and identify how factors like the victim’s characteristics and group context influence the likelihood of help.
2

The Phenomenon

They wanted to test the “Good Samaritan” phenomenon—do people help others even if they are strangers, and does the victim’s condition affect the response?

Methodological Insight

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Ecological Validity: A key strength is its ecological validity: The study was conducted in a realistic setting (New York City subway train), so the findings reflect real-world behaviour.

Procedure: Victim Conditions Tested

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Disabled Victim A “disabled” victim, appearing ill with a cane.
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Drunk Victim A “drunk” victim, smelling of alcohol and holding a bottle.

Procedure: Variables Observed

The emergency occurred between stops on the subway to ensure a fixed, confined environment.

ID Variable Type Victim Race Helper Race Time Help Spontaneous Bystander #
01 Help DV Y/N Y/N Sec Yes/No Count
02 Victim IV N/A N/A N/A N/A N/A
03 Data DV Observed Observed Recorded Observed Count

Findings Summary (Results and Conclusions)

Observation Factor Result
Overall Help Offered Over 90%
Disabled vs Drunk Help Disabled Faster/More
Diffusion of Responsibility Less evident
Crowd Effect Did not stop intervention

Challenging Lab Assumptions

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Wait, so is high liquidity always good? (Introduction for cards required)
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The presence of others did not stop intervention: Contrary to lab findings, this natural setting showed that crowds did not prevent helping.

Further Results

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Race Effects

People were more likely to help a victim of their own race.
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Proximity

More help from nearby passengers.
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Sample Size

It had a large sample size with thousands witnessing the emergencies.
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Ethics

The procedure was ethical under the conditions because the victim was immediately helped.

Evaluation: Strengths vs Weaknesses

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The Pros (Strengths) Ecological validity is high. Large sample size. Detailed behavioural observations gave a rich set of natural responses.
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The Cons (Weaknesses) Lack of control over extraneous variables. Ethical concerns (distressed passengers, unaware of participation). Results might be culturally/context-specific.

Conclusion

Field Data > Lab Theory
This study contributed substantially to understanding real-life bystander intervention and challenged earlier lab-based assumptions about the bystander effect.
Piliavin et al. (1969) Study Deck
Q
Main Aim

What was the main aim of Piliavin et al.’s 1969 study?

A
Answer

To explore bystander intervention in real-life emergencies and see how victim characteristics and group context affect helping.

Q
Location

Where did the Piliavin study take place?

A
Answer

On a New York City subway train.

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Victim Conditions

What were the two victim conditions used in the study?

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Answer

A “drunk” victim and a “disabled” victim.

Q
Victim Condition Effect

How did the victim's condition affect helping behaviour?

A
Answer

Disabled victims received help faster and more frequently than drunk victims.

Q
Diffusion of Responsibility

What did the study find about diffusion of responsibility?

A
Answer

Diffusion of responsibility was less evident; people often helped quickly even when many bystanders were present.

Q
Race Influence

How did race influence helping behaviour?

A
Answer

People were more likely to help victims of their own race.

Q
Strength

What was one major strength of the study?

A
Answer

It had high ecological validity due to the natural setting.

Q
Ethical Concern

Name one ethical concern raised by the study.

A
Answer

Some passengers were unaware they were part of the study, raising issues of consent and possible distress.

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Key Conclusion

What was a key conclusion of the study?

A
Answer

It challenged previous lab findings and showed that real-world bystander helping occurs frequently despite crowd presence.

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🌸 Piliavin et al. Study Quiz

1. What was the primary setting for Piliavin et al.’s study?

The study took place in a natural setting on a NYC subway to observe genuine helping behavior.

2. Which victim received help more quickly and frequently?

Help was offered faster and more often to disabled victims because they were perceived as more deserving of assistance.

3. True/False: The study found strong evidence for diffusion of responsibility in large groups.

Contrary to lab results, diffusion of responsibility was less evident, with many bystanders helping quickly.

4. How did race affect helping behavior?

The study observed racial bias, with helpers more likely to assist same-race victims.

5. Short answer: Name one ethical issue raised by the study.

Passengers were unaware they were part of an experiment and might have felt distressed or embarrassed.

📊 Results

  • Notes and Quiz
  • Psychology
  • GCSE
  • Developmental Psychology
  • EDEXCEL