Cognitive Load in Auditory-Only Narrative Processing: A Theoretical Framework for Duration Limits in Audio Cinema

Abstract—Traditional audiovisual cinema distributes cognitive load across visual and auditory channels, with empirical evidence suggesting visual processing dominance (70–83% of cortical resources). This theoretical paper proposes a Proportional Load Hypothesis for auditory- only narratives, arguing that the absence of visual input fundamentally alters cognitive demand characteristics. We critically examine existing neuroscientific literature on unisensory auditory processing, working memory capacity, and sustained attention to derive testable predictions regard- ing optimal duration for audio-only narrative engagement. Based on converging evidence from EEG studies (theta- band power increases), comprehension degradation curves, and working memory capacity models, we propose a 13–15 minute optimal duration window for sustained auditory narrative processing. We discuss sensory compensation strategies, including cross-modal transduction, and outline a research agenda for empirical validation. This framework provides theoretical grounding for emerging audio-only media formats including auditory cinema, podcast narrative design, and accessible media production. Keywords: auditory cinema, cognitive load theory, work- ing memory, sustained attention, cross-modal perception, audio narrative design