Logik (book)

Logik is an 1890 book by Alois Höfler and Alexius Meinong that originated the distinction between the act, content, and object of thought. Their theory (known as act-object psychology and act-content-object psychology) that every psychological state contains a mental act, a lived-through phenomenological content, and an intended object that the mental act is about influenced Kazimierz Twardowski, and became most associated with its development in his On the Content and Object of Presentations.