Heartbeat perception tasks are used to measure interoceptive accuracy. This paper explores the effect of reducing external auditory stimuli on heartbeat perception. Three samples (121 participants in total) performed a heartbeat perception task. Samples 1 and 2 wore ear-protectors and sample 3 did not. There were no differences in interoceptive accuracy between samples 1 and 2 but samples 1 and 2 showed significantly higher interoceptive accuracy than sample 3. These results suggest ear-protectors could be used to manipulate heartbeat perception and that the auditory component of heartbeat perception might be given greater consideration.