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What ethical limits apply to experiments involving people?

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Marble bust of Aristotle with a beard and draped robe, showing detailed facial features and wavy hair, set against a dark background. — Philosophy of science Aristotle, marble portrait bust, Roman copy (2nd century bce) of a Greek original (c. 325 bce); in the Museo Nazionale Romano, Rome.

In the philosophy of science, the ethical treatment of human subjects is governed by the fundamental principle that the rights and welfare of individuals must be prioritized above all other interests, including scientific curiosity or societal gain.12

To ensure these standards are met, research involving human participants is subject to rigorous oversight, primarily through an institutional review board (IRB). These committees evaluate research protocols based on three core ethical pillars: respect for persons, beneficence (minimizing harm while maximizing benefits), and justice.3

Key ethical requirements for human experimentation include:

Informed Consent: Participants must voluntarily agree to participate, fully understanding the nature of the study.14
Risk-Benefit Balance: The potential risks to subjects must never exceed the humanitarian importance of the research.1
Protection from Harm: Researchers must avoid unnecessary suffering and are obligated to terminate studies if they believe a participant is at risk of disabling injury or death.1
Qualified Oversight: Experiments must be conducted by qualified professionals, and independent committees must scrutinize projects to ensure risks are justified.14

These standards are informed by foundational documents such as the Nuremberg Code, the Declaration of Helsinki, and the Belmont Report.12