An experiment where an infant is isolated from the normal use of language in an attempt to discover the fundamental character of human nature or the origin of language.

(US) Prohibition

A social psychology experiment performed by Stanley Milgram in 1963, measuring people's willingness to obey an authority figure who instructed them to perform acts conflicting with their personal conscience.

An experiment in parapsychology that attempts to gauge telepathic ability by putting a subject into sensory deprivation and afterwards asking him/her to identify an object that was observed by somebody else during that period.

A parallel experiment designed to replicate the main experiment in every way, except in respect of the one variable that is being tested, so as isolate the effect of that variable; for example, an experiment in which subjects are given a placebo instead of an active drug, intended to check that any observed benefits of the drug derive from the drug itself and not from other factors involved in its administration.

(informal, humorous) A state of extreme uncleanliness, especially one which involves food mess left for an excessive period of time that is liable to spoil, rot, mold, etc.

A chemical reaction in which an aqueous solution containing glucose, sodium hydroxide and methylene blue turns from colourless to blue upon shaking and then loses its colour after a while. With further shaking, the cycle can be repeated several times.

In the field of human-computer interaction, a research experiment in which subjects interact with a computer system that they believe to be autonomous, but which is actually being operated by an unseen human being.

(physics, historical) An attempt in 1887 to detect the existence of the luminiferous aether by comparing the speed of light in perpendicular directions.

(physics) Any of various spectroscopic tests of the isotropy of mass and space, originally to test Mach's principle and now understood to be important tests of Lorentz invariance.