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The Rorschach test is a projective psychological test in which subjects' perceptions of inkblots are recorded and then analyzed using psychological interpretation, complex algorithms, or both. Some psychologists use this test to examine a person's personality characteristics and emotional functioning. It has been employed to detect underlying thought disorder, especially in cases where patients are reluctant to describe their thinking processes openly. The test is named after its creator, Swiss psychologist Hermann Rorschach. The Rorschach can be thought of as a psychometric examination of pareidolia, the active pattern of perceiving objects, shapes, or scenery as meaningful things to the observer's experience, the most common being faces or other patterns of forms that are not present at the time of the observation. In the 1960s, the Rorschach was the most widely used projective test.

The original Rorschach testing system faced numerous criticisms, which the Exner Scoring System—developed after extensive research in the 1960s and 1970s—aimed to address, particularly to improve consistency and reduce subjectivity. Despite these efforts, researchers continue to raise concerns about aspects of the test, including the objectivity of testers and inter-rater reliability, the verifiability and general validity of the test, bias in the test's pathology scales toward higher numbers of responses, its limited diagnostic utility and lack of replicability, its use in court-ordered evaluations and the value of projected images in general.