title: Left-handers show no self-advantage in detecting a delay in visual feedback concerning an active movement.
abstract: Right-handed people show an advantage in detecting a delay in visual feedback concerning an active movement of their right hand when it is viewed in a natural perspective compared to when it is seen as if viewing another person's hand (Hoover and Harris in Exp Brain Res 233:1053-1060, 2012. doi: 10.1007/s00221-014-4181-9 ; Exp Brain Res 222:389-397, 2015a. doi: 10.1007/s00221-012-3224-3 ). This self-advantage is unique to their dominant hand and may reflect an enhanced sense of ownership which contributes to how right-handed people relate to the world. Here we asked whether left-handers show the same pattern of performance for their dominant hand. We measured the minimum delay that could be detected by 29 left-handers when viewing either their dominant or non-dominant hand from 'self' or 'other' perspectives and compared their thresholds to an age-matched sample of 22 right-handers. Right-handers showed a significant signature self-advantage of 19 ms when viewing their dominant hand in an expected 'self' perspective compared to 'other' perspectives. Left-handers, however, showed no such advantage for either their dominant or non-dominant hand. This lack of self-advantage in detecting delayed visual feedback might indicate a less secure sense of body ownership amongst left-handers.
authors.affiliation: Department of Psychology, Centre for Vision Research, York University, 4700 Keele Street, Toronto, ON, M3J 1P3, Canada. adriah@yorku.ca.
authors.forename: Adria E N
authors.initials: AEN
authors.lastname: Hoover
authors.affiliation: Department of Psychology, Centre for Vision Research, York University, 4700 Keele Street, Toronto, ON, M3J 1P3, Canada.
authors.forename: Yasmeenah
authors.initials: Y
authors.lastname: Elzein
authors.affiliation: Department of Psychology, Centre for Vision Research, York University, 4700 Keele Street, Toronto, ON, M3J 1P3, Canada.
authors.forename: Laurence R
authors.initials: LR
authors.lastname: Harris
mesh_terms: D000328:Adult; D056228:Feedback, Sensory / Q000502:physiology*; D005260:Female; D007839:Functional Laterality / Q000502:physiology*; D006225:Hand; D006801:Humans; D008297:Male; D011434:Proprioception / Q000502:physiology*; D013997:Time Factors; D014796:Visual Perception / Q000502:physiology*; D055815:Young Adult
keywords: Body ownership; Cross-modal interactions; Handedness; Proprioception; Visual perspective