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Although the clinical tests of sensorium (CTS) are widely used as a quick check of mental efficiency (Slater and Roth, 1969), they have come together in a haphazard way and their validity has been questioned (Shapiro et al. , 1956). For example, a patient may be able to perform well on so-called memory tests such as Digit Span and Babcock Sentence and still have a florid memory disturbance (Roth and Hopkins, 1953; Zangwill, 1946).
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Hinton et al. (1971) studied this question.
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