5 Controversial Psychology Experiments That Would Never Happen Today

Scientific concepts, discoveries, and nature/behavioral phenomena

Core ethical framework (enabling what research can be done)

The video explains modern human-subject ethics, grounded in the 1970s Belmont Report, with three principles:

• Respect for persons: requires informed consent (participants understand risks/benefits).
• Beneficence: minimize harm (“do no harm”) by protecting participants’ wellbeing.
• Justice: ensure fair distribution of study burdens and benefits; avoid exploiting vulnerable groups.

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1) Classical conditioning in humans (fear conditioning)

Concept: Classical conditioning—pairing a stimulus that triggers a response (e.g., loud noise startles) with a previously neutral stimulus to produce a conditioned response (e.g., fear).

Claimed discovery/phenomenon: A child was reportedly conditioned to fear a fuzzy white rat after repeated pairing with loud noises.

Key elements described

• Inspired by Pavlov’s dog conditioning.
• 9-month-old “Albert” exposed to:
  • a fuzzy white rat (neutral stimulus)
  • and scary loud noise (unconditioned stimulus/startle)
• After repeated pairings, the sight of the rat triggered crying/crawling away.

Criticisms noted

• Single-subject design; no controls
• Lasting harm; no reconditioning to remove fear
• Consent/debriefing issues for a minor

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2) Feedback effects on language and self-esteem (“Monster Study”)

Concept: How positive vs. negative feedback affects:

• learning/behavior related to speech disorders (stuttering)
• self-esteem and social-emotional outcomes

Key elements described (methodology)

• Researchers: Wendell Johnson + Mary Tudor
• Setting: University of Iowa; children recruited from an orphanage
• Participants: 22 children
  • some with early signs of stutters
  • some with normal speech
• Group assignment and feedback:
  • Group A (5 described as having stutters): told they do not have a stutter and given positive feedback
  • Group B (5 described as having stutters): told they do have a stutter and given negative feedback

Reported outcomes

• Feedback type did not “cure” or strongly change stuttering behavior
• Positive feedback increased confidence
• Negative feedback increased withdrawal, self-consciousness, and frustration, even for some without stutters

Ethical concerns noted

• Minors could not provide proper consent
• Lack of protection and lack of debriefing/follow-up

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3) Obedience to authority under moral conflict (Milgram)

Concept: Psychology of obedience—the tendency to comply with an authority figure even when actions conflict with personal morals.

Key elements described (methodology)

• Researcher (authority): “Experimenter” in a lab coat
• Participants assigned roles:
  • Teacher: the real participant
  • Learner: an actor (to the Teacher, believed to be another volunteer)
• Setup:
  • Teacher instructs Learner via intercom
  • Learner is in a separate room out of sight
• Punishment manipulation:
  • Learner answers word-pair questions incorrectly
  • Teacher is instructed to administer electric shocks
  • voltage increases by 15 volts each time
• Termination:
  • ends when Teacher gives maximum 450V three times or refuses to continue

Reported result

• 65% of subjects delivered maximum shocks

Ethical harms noted

• Participants believed they were causing serious injury and that there was “no permanent tissue damage”
• Lack of appropriate informed consent

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4) Help-seeking delay in emergencies (Bystander Effect)

Concept: The bystander effect—individuals are less likely to help when other potential helpers are present.

Key elements described (methodology)

• Researchers: John Darley + Bibb Latané
• Participants: college student volunteers
• Setup:
  • subjects alone in rooms with headphones
  • told they are communicating with other students via intercom
  • other “students” are recordings
• Trap/critical event:
  • recorded student mentions occasional seizures
  • later voice has trouble speaking and requests help for a seizure
• Measurement:
  • time taken for the subject to go seek help

Reported result

• Response time increases and help likelihood decreases when more people are “present” in the conversation

Motivation described

• Helps explain why people may not act during crises; relevant to community protection and crime prevention.

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5) Role internalization and abusive behavior (Stanford Prison Experiment)

Concept: How social roles can shape behavior through role internalization, power dynamics, and loss of restraint.

Key elements described (methodology)

• Researcher: Philip Zimbardo (Stanford University), acted as superintendent
• Participants: 24 white male college students
• Assigned roles:
  • prisoners: searched and given ID numbers instead of names (dehumanization)
  • guards: given uniforms/clubs and instructed to maintain order (power/superiority)
• Planned duration: 2 weeks
• Actual duration: stopped after 6 days

Reported escalation

• prisoners became submissive
• guards became increasingly aggressive
• physical punishments and humiliations (e.g., sleeping on concrete, forced stripping)
• one prisoner released early due to panic/disorientation; revolt occurred

Ethical and design flaws noted

• Zimbardo’s role compromised impartiality
• Serious abuse and potential long-term harm were allowed
• Described as not ethically permissible today

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Researchers or sources featured (at end)

• Belmont Report (1970s ethical standards; report text/source)
• John Watson
• Wendell Johnson
• Mary Tudor
• Stanley Milgram
• Kitty Genovese (crime case motivating later work; discussed as a real-world event)
• John Darley
• Bibb Latané
• Philip Zimbardo
• Ivan Pavlov (referenced as origin of classical conditioning with dogs)
• SciShow (video/source context)