This book offers a comprehensive primer for the study of intensionality. It explores and assesses those key theories of intensionality which have been developed in the twentieth and early twenty-first centuries. Each of the examined theories is tested as to whether it can account for the problems associated with (A) the intersubstitution salva veritate of co-extensional expressions, and (B) existential generalisation. All of these theories are subsequently compared so as to determine which of them comes closest to successfully solving these problems. The book examines four kinds of intensionalist approaches: the Fregean approach (including Church's formalisation of Frege's theory); the possible-worlds approaches of Carnap, Montague and Cresswell; the theory of properties relations and propositions devised by Bealer; and the Meinongian approaches put forward by Zalta and Priest. The book also proposes an alternative to intensionalism: sententialism. Sententialists argue that the problems of intensionality could be solved by appealing to linguistic items (usually sentences) rather than intensional entities. Drawing on the works of Quine, Davidson, Scheffler and R. M. Martin, it explores the viability and value of sententialism as an alternative to intensionalism.

Mendelovici proposes a novel theory of intentionality in terms of phenomenal consciousness, arguing that the view avoids the problems of its competitors and can accommodate a wide range of cases, including those of thought and nonconscious states.

This volume analyses ancient and medieval theories of intentionality in various contexts: perception, imagination, and intellectual thinking. It sheds new light on classical theories (e.g. by Aristotle and Thomas Aquinas) and examines neglected sources, both Greek and Latin. It includes contributions by J. Biard, M. Burnyeat, V. Caston, D. Frede, R. Gaskin, E. Karger, C. Michon, D. O'Meara, C. Panaccio, R. Pasnau, D. Perler, Ch. Rapp, P. Simons, R. Sorabji, and H. Weidemann.

Since the late 1970's, the main research program for understanding intentionality -- the mind's ability to direct itself onto the world -- has been based on the attempt naturalize intentionality, in the sense of making it intelligible how intentionality can occur in a perfectly natural, indeed entirely physical, world. Some philosophers, however, have remained skeptical of this entire approach. In particular, some have argued that phenomenal consciousness - - the subjective feel of conscious experience -- has an essential role to play in the theory of intentionality, a role missing in the naturalization program. Thus a number of authors have recently brought to the fore the notion of phenomenal intentionality, as well as a cluster of nearby notions. There is a vague sense that their work is interrelated, complementary, and mutually reinforcing, in a way that suggests a germinal research program. With twelve new essays by philosophers at the forefront of the field, this volume is designed to launch this research program in a more self-conscious way, by exploring some of the fundamental claims and themes of relevance to this program.

This book has roots in our respective doctoral dissertations, both completed in 1970 at Stanford under the tutelage of Professors Dagfmn F øllesdal, John D. Goheen, and Jaakko Hintikka. In the fall of 1970 we wrote a joint article that proved to be a prolegomenon to the present work, our 'Intentionality via Intensions', The Journal of Philosophy 68 (1971). Professor Hintikka then suggested we write a joint book, and in the spring of 1971 we began writing the present work. The project was to last ten years as our conception of the project continued to grow at each stage. Our iritellectual debts follow the history of our project. During our dis sertation days at Stanford, we joined with fellow doctoral candidates John Lad and Michael Sukale and Professors Føllesdal, Goheen, and Hintikka in an informal seminar on phenomenology that met weekly from June of 1969 through March of 1970. During the summers of 1973 and 1974 we regrouped in another informal seminar on phenomenology, meeting weekly at Stanford and sometimes Berkeley, the regular participants being ourselves, Hubert Dreyfus, Dagfmn Føllesdal, Jane Lipsky McIntyre, Izchak Miller, and, in 1974, John Haugeland.

Ascriptions of mental states to oneself and others give rise to many interesting logical and semantic problems. Attitude Problems presents an original account of mental state ascriptions that are made using intensional transitive verbs such as 'want', 'seek', 'imagine', and 'worship'. Forbes offers a theory of how such verbs work that draws on ideas from natural language semantics, philosophy of language, and aesthetics.