Philosophical theories of mental content include internalism, externalism, representationalism and intentionality. It is governed exclusively neither by causality, nor by intentionality. There are three alternative kinds of directedness/intentionality one might posit for moods. That common ground is the notion of the intentionality of consciousness. Humans conduct biofeedback naturally all the time, at varied levels of consciousness and intentionality. Letwin found Scruton's discussions of personhood and intentionality obscure. Starting with the "principle of intentionality", mental phenomena are intentionally directed towards an object. These replies address Searle's concerns about intentionality, symbol grounding and syntax vs. semantics. Searle argues that this is not real understanding or intentionality. Weak intentionalists privilege intentionality to emphasize that texts do not have meanings in themselves. The moral concept of one's intentionality develops with experience in the world. Brentano's concept of intentionality would become widely influential, including on analytic philosophy. This kind of reality is in one sense hallucinatory, being a product of collective intentionality. Searle's account does also, with its invocation of collective intentionality. Young explains this existence as in an "inhibited intentionality".