UC San Diego

Many philosophical approaches hypothesize that one function of consciousness is the creation of a unified subjective experience (Baars, 2005; Bayne, 2010). Such unified experience links different processing streams, originating in separate perceptual modules, thus enabling common access and generation of integrated decisions. All of this presumably occurs via a mechanism that blends information from different modalities into a single, multidimensional representation. But what exactly is unified in conscious experience? Prevailing explanations focus on integration of specific stimulus features at a perceptual or decisional level. In this opinion piece we discuss a simple but underappreciated explanation that focuses on processing dynamics. Specifically, we propose that cross-modal integration is facilitated by different modalities having a similar effect on the global subjective experience of processing quality. This integrated experience can then enter into decisional processes concerned with its source and relevance for the current behavior. As such, our account combines "experiential" and "decisional" process. Below we place this argument in the context of research on cross-modal integration and processing experiences, and discuss some implications.