 How are we to analyse these sentences and the propositions they express? Husserl’s approach is to study the units of consciousness that the respective speaker presents himself as having—that he “gives voice to”—in expressing the proposition in question (for instance, while writing a mathematical textbook or giving a lecture). These units of consciousness he labels intentional acts or intentional experiences, since they always represent something as something—thus exhibiting what Brentano called intentionality. According to Husserl, there are non-intentional units of consciousness as well. (He quotes pain as an example.) What distinguishes intentional from non-intentional experiences is the former’s having intentional content.