[Symptom validity tests in psychiatric assessment: a critical review].

Neuropsychological symptom validity testing is increasingly used even in psychiatric expert assessment. Low scores on symptom validity tests can only demonstrate exaggerated symptoms. However, symptom validity tests do not address the question of whether the result is intentionally produced or motivated by internal incentives. Therefore, symptom validity tests cannot differentiate between malingering and somatoform disorder. Test results have to be considered carefully in the medicolegal context and require thorough clinical assessment.