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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 may lead to conscious or subconscious bias on the part, invalidating the results.

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

Blinding can be imposed on researchers, technicians, subjects, funders, or any mixture of them. The opposite of a blind trial is definitely an open trial. Blind experiments are an important 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 also to market research. In some disciplines, such as drug testing, blind experiments are considered essential. In other disciplines, blind experiments would 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, for example on a remote island having a fabricated enculturation, it is obviously a violation of ethics and human rights.

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

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