Factor analyses of the shortened form of Betts' questionnaire upon mental imagery

Factor analyses of the shortened forms of Belts' 1909 Questionnaire Upon Mental Imagery (QMI) developed by Sheehan (1967) revealed a general factor before rotation, specific factors after orthogonal and oblique rotations and a general factor after a second-order analysis of oblique factor pattern inter-correlations. The nature of these factors was discussed and it was suggested that the large general factor may represent demand characteristics while a smaller, bi-polar second factor represents relationships between imagery modalities.