  Each has its relative strengths and problems. HOT theorists note that we have no organs of inner sense and claim that we experience no sensory qualities other than those presented to us by outer directed perception. HOP theorists on the other hand can argue that their view explains some of the additional conditions required by HO accounts as natural consequences of the perception-like nature of the relevant higher-order states. In particular the demands that the conscious-making meta-state be noninferential and simultaneous with its lower level mental object might be explained by the parallel conditions that typically apply to perception. We perceive what is happening now, and we do so in a way that involves no inferences, at least not any explicit personal-level inferences. Those conditions are no less necessary on the HOT view but are left unexplained by it, which might seem to give some explanatory advantage to the HOP model (Lycan 2004, Van Gulick 2000), though some HOT theorists argue otherwise (Carruthers 2000).