Specialized procedure in which the examinee is directed to answer to himself instead of making a verbal response. The use of the SAT is prescribed by some PDD experts to help avoid distortions to the pneumograph tracings attributable to speech disorders, or to uncover certain countermeasures. To ensure examinees are attending to the content of the test questions, some PDD examiners instruct the examinees to indicate their responses by slightly nodding or shaking their heads. When the SAT is used with head movements, it is called an SAT Nod. See: Horvath (1972).