What You Miss Won’t Move You: Awareness Connects Respiratory Change to Subjective Arousal

Does physiological arousal shape emotion only when consciously perceived? Existing paradigms confound detection with signal magnitude, rendering this question intractable. The Breath Change Awareness Task (BCAT) resolves this confound by orthogonally manipulating signal magnitude and detection. Across five studies of undergraduate and community samples (total N = 787), detected changes produced arousal scaled to magnitude; equivalent undetected changes produced no differential response. In a pre-registered laboratory study with physiological verification (Study 5; N = 206), belt recordings confirmed physical compliance, and arousal gating was stronger during interoceptive engagement than visual tracking. Self-reported interoceptive awareness (MAIA) predicted detection confidence but not objective threshold, reflecting a disposition toward bodily awareness rather than detection ability. Conscious detection gates interoceptive arousal transfer: physiological change moves us only when we notice it. Findings are based on self-reported arousal and predominantly undergraduate samples, and warrant replication with clinical populations and objective physiological measures.