ABSTRACT
The psychotic traits questionnaires that have appeared have had varying theoretical and empirical origins. Not all have been constructed explicitly from a 'schizotypy' viewpoint, some being only marginally, if at all, influenced by that idea. In the full clinical domain it would correspond to the negative symptom aspects of schizophrenia. One way to address the question is relatively narrowly, with respect to those scales that belong in the 'classic' schizotypy tradition and which were specifically designed to measure features extrapolated from schizophrenia. An Einheitpsychose theory is of course the position adopted by Hans Eysenck, though applied in his case to normal individual differences, and even then based on a very particular construction of 'psychoticism' that is only interpretable when used alongside his other personality dimensions.
