In 1967 Gough and McGurk proposed a 30 item set of geometric forms and illusions for use in cross-cultural study of cognitive functioning. An Italian survey was therefore initiated to determine the applicability of the series and its validity in specifying age related cognitive levels. The results are discussed. (Author)

The study sought to evaluate the extent to which certain objective tests, ward behavior ratings, recorded verbalization scores, and interview behavior ratings possessed convergent and discriminant validity for 10 psychotic syndromes. It was concluded that the convergent and discriminant validity of the syndromes is strongly supported. (Author)