History of Terminology
Egon Brunswik defined the term "ecological validity" in the 1940s to describe a cue's informativeness. His students have written that the now-common use of "ecological validity" to describe a type of experimental validity was a corruption of his original terminology (see external link to paper by Hammond). Brunswik used the words representative design to describe what is now usually called the external validity of an experiment; this in turn depends partly on what is now usually called the ecological validity of the experiment. As originally defined by Brunswik, however, ecological validity was a property of a cue, not a property of an experiment.
Read more about this topic: Ecological Validity (perception)
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