Sensory Processing Sensitivity: Associations with the detection of real degraded stimuli, and reporting of illusory stimuli and paranormal experiences

Abstract

There are differences in Sensory Processing Sensitivity (SPS) within many species. In humans high SPS refers to greater responsivity to stimuli, slower, deeper processing, aesthetic sensitivity, and low threshold for sensory discomfort. This study tested whether SPS is associated with the accurate recognition of degraded auditory stimuli and susceptibility to auditory pareidolia (hearing illusory words when presented with ambiguous, degraded words). Fifty participants (mean age = 33.02; females n = 32, males n = 18) responded to degraded words presented in Deutsch's phantom word illusion task. They then completed the Highly Sensitive Person Scale, which assesses SPS, and the Survey of Anomalous Experiences. SPS was significantly associated with the recognition of degraded stimuli, but not with pareidolia. Number of anomalous experiences reported by participants was significantly associated with SPS and pareidolia. This study shows objective validation of the Highly Sensitive Person Scale regarding detection of subtle external stimuli.