Two-alternative forced choice  

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Two-alternative forced choice (2AFC) is a method for measuring the subjective experience of a person or animal through their pattern of choices and response times. The subject is presented with two alternative options, only one of which contains the target stimulus, and is forced to choose which one was the correct option. Both options can be presented concurrently or sequentially in two intervals (also known as two-interval forced choice, 2IFC). The term 2AFC is often mistakenly used for describing the more common yes-no task, where a subject is presented with one option only and is forced to choose whether it belongs to one or another category. 2AFC is a method of psychophysics developed by Gustav Theodor Fechner.

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