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Observer effect may refer to:
- Hawthorne effect, a form of reactivity in which subjects modify an aspect of their behavior, in response to their knowing that they are being studied
- Heisenbug of computer programming, where a software bug seems to disappear or alter its behavior when one attempts to study it
- Observer effect (information technology), the impact of observing a process while it is running
- Observer effect (physics), the impact of observing a physical system
- Probe effect, the effect on a physical system of adding measurement devices, such as the probes of electronic test equipment
- Observer-expectancy effect, a form of reactivity in which a researcher's cognitive bias causes them to unconsciously influence the participants of an experiment
It may also refer to:
- "Observer Effect" (Star Trek: Enterprise), an episode of Star Trek: Enterprise, named after this effect
- Heisenberg's uncertainty principle
- Actor-observer bias
- Schrödinger's cat, a thought experiment, often described as a paradox, devised by Austrian physicist Erwin Schrödinger
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