The timing of the stimulus relative to the cardiac cycle influenced conscious perception. This is further evidenced by the fact that higher HEPs were followed by decreases in brain responses related to conscious external somatosensory perception (e.g., P300). If the brain is more focused on internal signals such as the heartbeat, it may then be less aware of external signals from the outside world. The researchers explained that this might be due to the fact that the brain divides its attention between external signals in the environment and internal signals within the body.
The researchers found that if the brain’s response to the heartbeat, measured using the HEP, was higher, people were less able to detect the stimulus. The brain’s attentiveness to the heartbeat influenced conscious perception. Electrocardiography (ECG) was used to measure the electrical activity of the heart, and electroencephalography was used to measure a number of key brain responses including (1) The heartbeat-evoked potential (HEP) which indicates the brain’s response to the heartbeat and so is a marker of cardiac interoception (2) The P300 response, which is related to conscious external somatosensory perception. After each stimulus, participants were asked if they could detect the electrical stimuli, and if so if they could identify which finger the stimuli had been administered to. To investigate how the heartbeat influences conscious perception, weak electrical stimuli were administered to either the left index or middle finger of 37 participants. combine electroencephalography and electrocardiography to explore how and why the heartbeat influences conscious perception. whether it is contracting or expanding) can influence their perception of external stimuli. But does the heart influence the brain? A number of recent studies have shown that even though humans are mostly not aware of their heartbeats, the state of the heart (e.g. For example, when we experience danger the heart beats faster. It is common knowledge that the brain influences the heart.
The heart and the brain are two of the most important organs in the body. Post by Flora Moujaes What's the science?
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