Somatosensory false feedback biases emotional ratings through interoceptive embodiment.
Scientific reports April 3, 2025 Joel Patchitt, Sarah Garfinkel, William H Strawson et al. 4 citations
False physiological feedback—mismatches between perceived and actual bodily signals—can bias how people judge the emotional intensity of faces. Prior work using auditory feedback suggested that perceived changes in heart rate increase intensity ratings regardless of whether the feedback indicates a faster or slower heart rate, with the right anterior insula acting as a mismatch detector. This study used pulsatile somatosensory stimulation (vibration) at rates above, below, or matching participants' heart rate, or no stimulation, while they rated emotional faces during brain scanning. Feedback produced a bidirectional effect: intensity ratings increased over each 20-second stimulation block.