 The fact that we can be directed towards one and the same object in different ways allows Brentano to introduce a classification of mental phenomena. He distinguishes three basic kinds: presentations, judgments, and emotions (which he refers to as “phenomena of love and hate”). These are not three completely distinct classes, though. Presentations are the most basic kind of acts; we have a presentation each time when we are directed towards an object, be it that we are imagining, seeing, remembering, or expecting it, etc. In his Psychology Brentano held that two presentations can differ only in the object, towards which they are directed. Later he modified his position, though, and argued that they can also differ in various modes, such as temporal modes (cf. PES 217 [This text is part of the appendix to the second part of PES from 1911 – for the German original cf. PES, vol II, 142]). The two other categories, judgments and phenomena of love and hate, are based on presentations. In a judgment we accept or deny the existence of the presented object. A judgment, thus, is a presentation plus a qualitative mode of acceptance or denial. The third category, which Brentano names “phenomena of love and hate,” comprises emotions, feelings, desires and acts of will. In these acts we have positive or negative feelings or attitudes towards an object. 