The existential assumptions of traditional logic

There have been and continue to be disagreements about how to consider the traditional square of opposition and the traditional inferences of obversion, conversion, contraposition and inversion from the perspective of contemporary quantificational logic. Philosophers have made many different attempts to save traditional inferences that are invalid when they involve empty classes. I survey some of these attempts and argue that the only satisfactory way of saving all the traditional inferences is to make the existential assumption that both the subject and predicate classes and their complement classes are non-empty for all the propositions we admit. I briefly indicate the room for continued controversy over how properly to interpret Aristotle’s statements regarding these inferences, but find some plausibility in the views of Manley Thompson and A.N.Prior that Aristotle had in mind a particular arrangement of existential import unfamiliar to most contemporary logicians     

The case for existential therapy in HIV-related psychotherapy

Few topics currently evoke such debate and dynamics as HIV and AIDS. It is a phenomenon that affects people at all levels of their existence, including in their psychotherapy experience. There is an ever growing field of HIV related psychotherapy. Currently this field contains work from a cognitive behavioural focus, a systemic one, work from a psychodynamic focus and from the Group Analytic approach. In this paper the case for existential psychotherapy will be made as an important approach with a great deal to offer the field of HIV-related psychotherapy.     

Divergences in American psychiatry during the Depression: somatic psychiatry, community mental hygiene, and social reconstruction

The differences between somatic psychiatrists and mental hygienists, already apparent earlier, became much more pronounced during the Depression years, partly as a consequence of their different perspectives on this social crisis. Somatic psychiatrists, emboldened by the apparent success of new medical treatment methods, reasserted the central position of the mental hospital within psychiatry, attempted to improve the discipline's position within medicine, and promoted basic research. Mental hygienists, following the ideal of prevention, proposed far-reaching programs of community mental hygiene to alleviate widespread mental distress. A small group of mental hygienists embraced socialism and advocated measures of radical social reconstruction.     

Semantics for existential graphs

This paper examines Charles Peirce's graphical notation for first-order logic with identity. The notation forms a part of his system of existential graphs, which Peirce considered to be his best work in logic. In this paper a Tarskian semantics is provided for the graphical system.     

The measurement of mood

Due to unfortunate choices of response scale and psychometric model earlier analyses of mood adjective check lists have given a confused and complex picture of the area. When an adequate response scale was applied and a simplex rather than a common factor analysis model was utilized it was found, in two empirical studies, that mood was possible to describe with a few bipolar factors. A theory is suggested where mood is seen as basically two-dimensional: one dimension being activity and the other pleasantness. More or less specific definitions of the content of experience with reference to the situation may then be used to define further dimensions, such as social orientation.