title: Multisensory distortions of the hand have differential effects on tactile perception.
abstract: Research has suggested that altering the perceived shape and size of the body image significantly affects perception of somatic events. The current study investigated how multisensory illusions applied to the body altered tactile perception using the somatic signal detection task. Thirty-one healthy volunteers were asked to report the presence or absence of near-threshold tactile stimuli delivered to the index finger under three multisensory illusion conditions: stretched finger, shrunken finger and detached finger, as well as a veridical baseline condition. Both stretching and shrinking the stimulated finger enhanced correct touch detections; however, the mechanisms underlying this increase were found to be different. In contrast, the detached appearance reduced false touch reports-possibly due to reduced tactile noise, as a result of attention being directed to the tip of the finger only. These findings suggest that distorted representations of the body could have different modulatory effects on attention to touch and provide a link between perceived body representation and somatosensory decision-making.
authors.affiliation: School of Psychology, University of Nottingham Malaysia Campus, Jalan Broga, 43500, Semenyih, Selangor Darul Ehsan, Malaysia.
authors.forename: A
authors.initials: A
authors.lastname: Treshi-marie Perera
authors.affiliation: School of Psychology, University of Nottingham UK Campus, University Park, Nottingham, NG7 2RD, UK.
authors.forename: Roger
authors.initials: R
authors.lastname: Newport
authors.affiliation: School of Psychology, University of Nottingham Malaysia Campus, Jalan Broga, 43500, Semenyih, Selangor Darul Ehsan, Malaysia. kmckenzie@lincoln.ac.uk.|School of Psychology, University of Lincoln, Brayford Pool, Lincoln, LN6 7TS, UK. kmckenzie@lincoln.ac.uk.
authors.forename: Kirsten J
authors.initials: KJ
authors.lastname: McKenzie
mesh_terms: D000293:Adolescent; D000328:Adult; D005260:Female; D005385:Fingers / Q000294:innervation*; D006801:Humans; D007088:Illusions / Q000502:physiology*; D008297:Male; D010812:Physical Stimulation; D011434:Proprioception / Q000502:physiology*; D012684:Sensory Thresholds / Q000502:physiology; D011795:Surveys and Questionnaires; D014110:Touch; D055698:Touch Perception / Q000502:physiology*; D014732:Vibration; D055815:Young Adult
keywords: MIRAGE; Multisensory illusions; Signal detection; Somatic signal detection task; Tactile perception