title: Cross-modal repetition effects in the mu rhythm indicate tactile mirroring during action observation.
abstract: Similar cortical activations during the experience and observation of touch suggest the presence of a tactile mirroring system. However, the specificity of observation-related activity - i.e., whether observation excites the same representations as experience of that specific tactile stimulation - is still to be established. Furthermore, central mu rhythms are attenuated during the experience and observation of touch, and also during action observation and execution, making it unclear whether they index processing of predominantly tactile or motor features of observed actions. The present study used an electroencephalography (EEG) cross-modal repetition paradigm to assess the relative tactile and motor specificity of mu attenuation during action observation. Two experiments were carried out during which participants executed and observed actions in alternation, and the repetition of either tactile or motor features of the actions were manipulated. The mu signal over central electrodes varied as a function of tactile repetition, consistent with the claim of a tactile mirroring system and its reflection in the mu signal. Of note was the fact that mu attenuation was sensitive only to manipulation of tactile - not motor - properties of actions, suggesting that caution should be employed when interpreting mu effects during action observation as reflective of motor mirroring.
authors.affiliation: School of Psychology, Université Laval, Quebec City, Canada; Center for Interdisciplinary Research in Rehabilitation and Social Integration (CIRRIS), Quebec City, Canada.
authors.forename: Michel-Pierre
authors.initials: MP
authors.lastname: Coll
authors.affiliation: MRC Social, Genetic, and Developmental Psychiatry Centre, Institute of Psychiatry, King's College London, UK; Institute of Cognitive Neuroscience, UCL, London, UK.
authors.forename: Geoffrey
authors.initials: G
authors.lastname: Bird
authors.affiliation: Department of Psychology, University of Surrey, Guildford, UK.
authors.forename: Caroline
authors.initials: C
authors.lastname: Catmur
authors.affiliation: Department of Psychological Sciences, Birkbeck, University of London, UK. Electronic address: c.press@bbk.ac.uk.
authors.forename: Clare
authors.initials: C
authors.lastname: Press
mesh_terms: D000293:Adolescent; D000328:Adult; D001931:Brain Mapping; D058256:Brain Waves / Q000502:physiology*; D004569:Electroencephalography; D005260:Female; D006801:Humans; D007100:Imitative Behavior / Q000502:physiology*; D008297:Male; D059167:Mirror Neurons / Q000502:physiology*; D010775:Photic Stimulation; D011597:Psychomotor Performance / Q000502:physiology; D055698:Touch Perception / Q000502:physiology*; D055815:Young Adult
keywords: Adaptation; Mirror neurons; Mu rhythm; Somatosensory