When an audience member becomes immersed, attention is shifted towards the media and story, and this is accompanied by the allocation of mental resources to represent events and characters. Here we investigate whether it is possible to measure immersion using continuous behavioural or physiological measures. Using television and film clips, we validated dual-task reaction times, heart rate, and skin conductance against self-reported narrative engagement. We find that reaction times in the

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... ask were strongly positively correlated with immersion: slower reaction times were indicative of greater immersion, particularly emotional engagement. Synchrony in heart rate between participants was associated with attentional and emotional engagement with the story, although we found no such relationship with skin conductance. These results establish both dual-task reaction times and heart rate as candidate measures for the real-time, continuous, assessment of audience immersion.