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A blind or blinded experiment is a scientific experiment where some of the people involved are prevented from knowing certain information that might lead to conscious or subconscious bias on the part, invalidating the results.

For example, when asking consumers to compare the tastes of various brands of a product, the identities from the product should be concealed - otherwise consumers will generally tend to prefer the brand they are familiar with. Similarly, when evaluating the effectiveness of a medical drug, both the patients and the doctors who administer the drug may be kept in the dark concerning the dosage being applied every time - to forestall any chance of a placebo effect, observer bias, or conscious deception.

Blinding can be imposed on researchers, technicians, subjects, funders, or any combination of them. The opposite of the blind trial is an open trial. Blind experiments are an essential tool of the scientific method, in many fields of research - from medicine, forensics, psychology and also the social sciences, to natural sciences such as physics and biology and to market research. In some disciplines, such as drug testing, blind experiments are thought essential. In other disciplines, blind experiments could be very useful, but they are totally impractical or unethical. An oft-cited example is in the field of developmental psychology. Although it would be scientifically expedient to raise children under arbitrary experimental conditions, such as on a remote island with a fabricated enculturation, it is obviously a violation of ethics and human rights.

The terms blind (adjective) or to blind (transitive verb) when utilized in this sense are figurative extensions from the literal idea of blindfolding someone. The terms masked in order to mask may be used for the same concept. (This is commonly the case in ophthalmology, where the word \\\'blind\\\' is usually used in the literal sense.)

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