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Previous attempts, using adjective checklists, to demonstrate the existence of mood factors have found only monopolar factors where commonsense would lead us to expect bipolar factors. This surprising effect is attributed to deficiencies in the rating scale used. An improved rating scale is compared with one commonly employed. The results show that monopolarity is associated with the old scale, whilst bipolarity emerges with a new improved scale. A complete reappraisal of the current status of mood adjective checklist factors is recommended.
Ray Meddis (Thu,) studied this question.