Milgram’s Obedience Experiment: The Shock Machine Revisited
Milgram’s obedience experiment was a Yale social psychology study by Stanley Milgram, first published in 1963, in which volunteers acting as “teachers” believed they were giving electric shocks to a “learner” when instructed by an authority figure. In the classic condition, 65% reached the maximum 450 volts. The study is used to explain obedience, legitimacy of authority, the agentic state, gradual commitment, and moral strain. Modern replications cannot ethically repeat the full design, so they use partial stopping rules, virtual reality, lower shock ranges, or archival analysis. The best current interpretation is not “people blindly obey,” but that obedience is shaped by authority, institutional legitimacy, identification with science, social support, resistance, and coercive context.
In 1961, only months after Adolf Eichmann’s trial began in Jerusalem, Stanley Milgram asked a brutal question in a quiet Yale laboratory: could ordinary people be led to harm another person simply because an authority figure told them to continue?
The public version is famous: a volunteer becomes a “teacher”, a man in a lab coat gives instructions, a “learner” cries out from another room, and the teacher keeps pressing switches labelled up to 450 volts. The disturbing headline was that many normal adults obeyed.
The modern version is more interesting. Participants were not robotic. They sweated, protested, laughed nervously, negotiated, delayed, challenged the experimenter, and often showed intense moral strain. Milgram remains essential for exams, but the highest marks now come from knowing the classic finding and the modern critique at the same time.
| Researcher | Stanley Milgram, Yale University |
|---|---|
| Dates | Experiments began in 1961; classic article published in 1963; book published in 1974 |
| Field | Social psychology, social influence, obedience to authority |
| Sample | 40 adult male volunteers in the classic published study, aged about 20-50, recruited from the New Haven area through newspaper advertisements and mail solicitation |
| Cover story | Participants were told the study examined the effect of punishment on learning and memory |
| Design | Controlled laboratory observation with deception; the “learner” was a confederate and the shocks were fake |
| Key measure | Maximum shock level the participant was willing to administer when instructed by the experimenter |
| Classic result | 26 of 40 participants (65%) reached the maximum 450-volt switch; all reached at least 300 volts |
| Core explanation | Obedience increases when authority appears legitimate, responsibility is shifted, the victim is psychologically distant, and commitment escalates gradually |
| Modern status | Still influential but contested. Modern work stresses resistance, identification with science, ethical limits, procedural messiness, and partial rather than full replication |
Aim, Hypothesis and Method
IASNOVA.COMMilgram wanted to investigate obedience to authority: the tendency to follow direct commands from a person perceived as legitimate, even when those commands conflict with personal conscience. The historical background matters. Milgram was interested in whether atrocities could be explained only by abnormal personalities, or whether ordinary people in powerful situations could become agents of harm.
The study was presented as a memory experiment. In reality, it measured how far a participant would go in administering apparently painful shocks to another person when a scientific authority insisted that the procedure must continue.
The Procedure: How the Trap Worked
IASNOVA.COMMilgram’s procedure worked because it did not feel like a single monstrous decision. It felt like a series of small, authorised steps. The participant had already agreed to attend Yale, already accepted the memory-study cover story, already watched the learner being strapped in, already received a sample shock, and already started at only 15 volts. By the time the learner protested, the participant was embedded in the script.
Adult men volunteered for what was advertised as a study of memory and learning, not obedience.
The participant always became the teacher. The learner was always the confederate.
The teacher received a real mild shock to make the apparatus feel believable.
The teacher tested the learner and increased the shock level after each wrong answer.
The learner complained, refused to answer, and eventually fell silent according to a script.
If the teacher hesitated, the experimenter used standard prompts such as “please continue”.
For short-answer questions, write the procedure in this order: cover story → rigged role allocation → shock generator → learner protests → experimenter prods → obedience measured by maximum voltage.
Findings: The 65% Result
IASNOVA.COMThe result that made Milgram famous was simple and horrifying: 65% of participants continued to 450 volts. This did not mean they were calm. Milgram’s paper describes signs of extreme tension: sweating, trembling, stuttering, nervous laughter, and repeated attempts to stop. The study therefore shows obedience under conflict, not obedience without conscience.
26 of 40 participants in the classic published study went to the maximum switch.
No participant stopped before the point at which the learner strongly resisted.
The generator rose in 15-volt increments from 15 to 450 volts.
Milgram concluded that ordinary people can enter an agentic state, where they see themselves as instruments carrying out another person’s wishes. When responsibility is transferred to a legitimate authority, people may obey commands that conflict with their private moral standards.
The strong answer is careful: Milgram does not prove that everyone will obey any order. It shows that obedience rises under particular conditions: a prestigious setting, gradual escalation, a calm authority figure, distance from the victim, and no visible support for resistance.
Variables Affecting Obedience
IASNOVA.COMMilgram did not run just one study. He ran a programme of variations to identify situational variables. These variations are central in AQA, AP Psychology, IB and UPSC answers because they show that obedience is not fixed; it changes when the authority, victim, setting or social support changes.
Say: “Milgram’s variations support situational explanations because obedience changed systematically when proximity, location, legitimacy and social support changed.” That one sentence often unlocks AO3 evaluation marks.
Explaining Obedience: Old Model vs New Model
IASNOVA.COMTextbooks often teach Milgram through the agentic state and legitimacy of authority. Modern researchers add a deeper interpretation: people may not be blindly obeying authority so much as working toward a cause they believe is valuable. In Milgram’s lab, that cause was science.
- Agentic state: the participant sees themselves as an instrument of the experimenter.
- Legitimacy of authority: Yale, the lab coat and scientific language signal that the experimenter has the right to direct behaviour.
- Binding factors: participants continue to avoid appearing rude, wasting the study, or admitting that earlier shocks were wrong.
- Gradual commitment: the voltage increases in small steps, making refusal psychologically harder over time.
- Engaged followership: people comply when they identify with the authority’s mission, such as advancing science.
- Resistance is normal: many participants argued, delayed, sought reassurance, or tried to protect the learner.
- Direct orders can fail: research on Milgram’s prods suggests that blunt command is often less effective than appeals to scientific necessity.
- Coercive context matters: the experimenter’s silence and institutional framing may have narrowed perceived freedom to refuse.
Ethical Evaluation: Why Full Replication Is Impossible
IASNOVA.COMMilgram is one of the main reasons psychology students learn research ethics so seriously. The study produced valuable insight, but at a cost that would not pass ordinary ethics review today.
- High control: the procedure was standardised, allowing variations to isolate situational factors.
- Powerful real-world relevance: the study illuminated obedience in institutions, bureaucracy, war and harmful organisations.
- Generated ethical reform: it helped shape modern informed consent, debriefing and protection-from-harm standards.
- Replicable pattern: partial replications often find substantial compliance even under ethical safeguards.
- Deception: participants were misled about the true aim, the learner and the shocks.
- Psychological harm: many showed severe distress during the procedure.
- Right to withdraw: the experimenter’s prods made withdrawal feel difficult, even if technically possible.
- Sample bias: the classic study used male volunteers from one American region.
- Demand characteristics: participants may have inferred that the experimenter expected continuation.
- Ecological validity debate: the lab situation is artificial, yet the emotional conflict appeared real.
Modern Replications and Reinterpretations
IASNOVA.COMBecause Milgram’s full procedure is ethically unacceptable today, modern researchers use modified designs. These do not ask exactly the same question as Milgram, but they show which pieces of the obedience effect survive under modern constraints.
Slater et al.: Virtual reality reprise
Participants knew the learner was virtual, so the major deception problem was reduced. Even so, many responded physiologically and emotionally as if the virtual learner’s suffering mattered. The finding supports VR as an ethical way to study compliance, discomfort and presence.
Burger: The 150-volt solution
Jerry Burger stopped the procedure at 150 volts, the first major protest point. About 70% of participants were willing to continue beyond that point, only slightly lower than Milgram’s comparable rate. This is the key modern replication for exams.
Dolinski, Grzyb et al.: Poland obedience-lite study
A Central European version using a lower shock range found high obedience: around 90% went to the highest level in that modified procedure. The authors emphasised that ethical limits prevent full replication, but obedience pressure remained strong.
Haslam and Reicher: From blind obedience to engaged followership
Rather than seeing participants as blindly submissive, this view argues that they complied when they identified with the experimenter’s scientific project. People do harmful things more readily when they believe the authority represents a worthy cause.
Grzyb, Dolinski and Cantarero: Authority knows no gender
This study tested whether the experimenter’s gender affected obedience. In a laboratory obedience-lite design, compliance was statistically similar with a female experimenter and a male experimenter, suggesting professional authority can override gender expectations.
Kaposi and Sumeghy: Archival procedural critique
Using Milgram archival material, this paper argues that many “fully obedient” sessions were not fully obedient to the whole memory-learning procedure. Participants often continued administering shocks while violating other procedural rules, complicating the old picture of legitimate obedience.
Key Terms Glossary
IASNOVA.COM- Obedience
- A form of social influence in which a person follows a direct order from an authority figure.
- Agentic state
- A psychological state in which an individual sees themselves as carrying out another person’s wishes and therefore feels less personally responsible.
- Autonomous state
- A state in which a person sees themselves as responsible for their own actions. Milgram argued that obedience involves an autonomous-to-agentic shift.
- Legitimacy of authority
- The perception that a person or institution has the right to give orders. In Milgram, Yale University and the scientific experimenter increased legitimacy.
- Moral strain
- The distress produced when a person obeys an order that conflicts with conscience. Milgram’s participants showed intense moral strain.
- Binding factors
- Psychological pressures that keep a person in a situation, such as politeness, commitment, embarrassment, and fear of disrupting the experiment.
- Gradual commitment
- The tendency to continue after a series of small steps, because each next step feels only slightly different from the previous one.
- Experimenter prods
- Scripted prompts used when participants hesitated, including “please continue” and “the experiment requires that you continue.”
- Engaged followership
- Haslam and Reicher’s reinterpretation: participants harm others when they identify with an authority’s cause, not simply because they obey orders blindly.
- 150-volt solution
- Burger’s ethical replication method: stop the study at 150 volts, the first major protest, because Milgram’s data suggested this point predicts later continuation.
Exam Strategy: How to Write Milgram Answers
IASNOVA.COMMilgram questions often look easy because everyone remembers “65%”. Top answers do more: they describe the procedure precisely, link findings to situational variables, evaluate ethics, and use modern replications to avoid textbook simplification.
What was Milgram’s obedience experiment?
It was a Yale laboratory study in which participants believed they were administering increasingly intense electric shocks to a learner when instructed by an experimenter. The learner was a confederate and the shocks were fake. The real aim was to measure obedience to authority.
What was the main finding of Milgram’s study?
In the classic published study, 26 of 40 participants, or 65%, continued to the maximum 450-volt shock level. All participants reached at least 300 volts.
Why is Milgram’s experiment unethical?
It involved deception, psychological stress, compromised withdrawal, and participants’ belief that they might be seriously harming another person. These issues make full replication unacceptable under modern ethics standards.
What is the agentic state?
The agentic state is Milgram’s explanation that obedient people may see themselves as instruments of an authority figure, reducing their sense of personal responsibility for the consequences.
What is legitimacy of authority?
Legitimacy of authority is the perception that a person or institution has the right to issue commands. In Milgram’s study, Yale University, scientific language and the experimenter’s role increased legitimacy.
What did Burger’s 2009 replication show?
Burger ran a partial replication that stopped at 150 volts, the first major protest. Around 70% of participants were willing to continue, suggesting substantial obedience still occurred under modern safeguards.
What did the Polish obedience-lite study find?
Dolinski, Grzyb and colleagues used an ethical modified procedure in Poland and found high obedience, with about 90% reaching the highest level available in that modified design.
What is engaged followership?
Engaged followership is Haslam and Reicher’s reinterpretation of Milgram. It argues that people comply when they identify with an authority’s cause, such as scientific progress, rather than simply obeying blindly.
Is Milgram still accepted in psychology?
Yes, but not in the simplistic form often repeated online. The study remains central to social psychology and research ethics, while modern scholarship criticises its ethics, reporting, interpretation and procedural complexity.
How do I compare Milgram with Zimbardo?
Both are classic situationist studies showing how social contexts can shape harmful behaviour. Milgram focuses on obedience to authority; Zimbardo focuses on conformity to social roles. Both are ethically controversial and both have been reinterpreted by modern researchers.
- Milgram, S. (1963). Behavioral study of obedience. Journal of Abnormal and Social Psychology, 67(4), 371-378. DOI: 10.1037/h0040525.
- Milgram, S. (1974). Obedience to Authority: An Experimental View. Harper & Row.
- Burger, J. M. (2009). Replicating Milgram: Would people still obey today? American Psychologist, 64(1), 1-11. DOI: 10.1037/a0010932.
- Slater, M., Antley, A., Davison, A., Swapp, D., Guger, C., Barker, C., Pistrang, N., & Sanchez-Vives, M. V. (2006). A virtual reprise of the Stanley Milgram obedience experiments. PLOS ONE, 1(1), e39. DOI: 10.1371/journal.pone.0000039.
- Doliński, D., Grzyb, T., Folwarczny, M., Grzybała, P., Krzyszycha, K., Martynowska, K., & Trojanowski, J. (2017). Would you deliver an electric shock in 2015? Social Psychological and Personality Science, 8(8), 927-933. DOI: 10.1177/1948550617693060.
- Haslam, S. A., & Reicher, S. D. (2017). 50 years of “Obedience to Authority”: From blind conformity to engaged followership. Annual Review of Law and Social Science, 13, 59-78.
- Grzyb, T., Doliński, D., & Cantarero, K. (2025). Authority knows no gender: Gender effects in exerting obedience in Milgram’s experiment. Social Psychology, 56(2), 85-97. DOI: 10.1027/1864-9335/a000575.
- Kaposi, D., & Sumeghy, D. (2026). From legitimate to illegitimate violence: Violations of the experimenter’s instructions in Stanley Milgram’s “obedience to authority” studies. Political Psychology, 47(2), e70112. DOI: 10.1111/pops.70112.
- AQA (2025). A-level Psychology 7182 specification: Social influence, obedience, agentic state, legitimacy of authority and Milgram’s variations.
- College Board (2025-26). AP Psychology Course and Exam Description: Social Psychology and Personality.
