Imitating others' actions: transcranial magnetic stimulation of the parietal opercula reveals the processes underlying automatic imitation

The human tendency to imitate gestures performed by conspecifics is automatic in nature. However, whether this automatic imitation can be considered as a true imitative phenomenon or only as a special instance of spatial compatibility is still being debated. New evidence suggests that automatic imitation, otherwise known as ‘imitative compatibility’, shall be considered as a phenomenon that operates independently from spatial compatibility. So far there are only a few investigations directly aimed at identifying the neural structures dedicated to this process. In the present study, we applied double‐pulse transcranial magnetic stimulation (TMS) over the parietal opercula to further investigate the role of these regions in coding imitative compatibility. We found that a temporary disruption of parietal opercula caused the reduction of the imitative compatibility relative to the sham condition. In particular, the TMS interference with the parietal opercula's activity modulated the imitative compatibility but not the spatial compatibility, suggesting that these two processes are likely to be independent.

[1]  Matthew R Longo,et al.  Imitative response tendencies following observation of intransitive actions. , 2006, Journal of experimental psychology. Human perception and performance.

[2]  P. Haggard,et al.  Viewing the body prepares the brain for touch: effects of TMS over somatosensory cortex , 2005, The European journal of neuroscience.

[3]  Gereon R Fink,et al.  The somatotopic organization of cytoarchitectonic areas on the human parietal operculum. , 2007, Cerebral cortex.

[4]  Caroline Catmur,et al.  Associative sequence learning: the role of experience in the development of imitation and the mirror system , 2009, Philosophical Transactions of the Royal Society B: Biological Sciences.

[5]  J R Simon,et al.  Effect of Compatibility of S-R Mapping on Reactions toward the Stimulus Source , 1979, Acta psychologica.

[6]  W. Prinz,et al.  Movement observation affects movement execution in a simple response task. , 2001, Acta psychologica.

[7]  Aude Billard,et al.  Parallel and distributed neural models of the ideomotor principle: An investigation of imitative cortical pathways , 2006, Neural Networks.

[8]  C. Heyes,et al.  Experience modulates automatic imitation. , 2005, Brain research. Cognitive brain research.

[9]  J. Mazziotta,et al.  Cortical mechanisms of human imitation. , 1999, Science.

[10]  Rainer Goebel,et al.  The brain's intention to imitate: The neurobiology of intentional versus automatic imitation , 2008, Brain Stimulation.

[11]  C. Heyes.  Automatic imitation. , 2011, Psychological bulletin.

[12]  C. Heyes,et al.  Automatic imitation of intransitive actions , 2008, Brain and Cognition.

[13]  G. Rizzolatti,et al.  Neurophysiological mechanisms underlying the understanding and imitation of action , 2001, Nature Reviews Neuroscience.

[14]  J. Richard Simon,et al.  Effect of compatibility of S-R mapping on reactions toward the stimulus source. , 1981 .

[15]  G. Fink,et al.  What Is the Position of an Arm Relative to the Body? Neural Correlates of Body Schema and Body Structural Description , 2009, The Journal of Neuroscience.

[16]  Caroline Catmur,et al.  Time course analyses confirm independence of imitative and spatial compatibility. , 2011, Journal of experimental psychology. Human perception and performance.

[17]  Timothy Edward John Behrens,et al.  Anatomical and Functional Connectivity of Cytoarchitectonic Areas within the Human Parietal Operculum , 2010, The Journal of Neuroscience.

[18]  Ty W. Boyer,et al.  Is automatic imitation a specialized form of stimulus-response compatibility? Dissociating imitative and spatial compatibilities. , 2012, Acta psychologica.

[19]  Mara Fabri,et al.  Cortical areas within the lateral sulcus connected to cutaneous representations in areas 3b and 1: A revised interpretation of the second somatosensory area in macaque monkeys , 1995, The Journal of comparative neurology.

[20]  L Krubitzer,et al.  A redefinition of somatosensory areas in the lateral sulcus of macaque monkeys , 1995, The Journal of neuroscience : the official journal of the Society for Neuroscience.

[21]  W. Prinz,et al.  Compatibility between Observed and Executed Finger Movements: Comparing Symbolic, Spatial, and Imitative Cues , 2000, Brain and Cognition.

[22]  Paola Mengotti,et al.  Imitation components in the human brain: An fMRI study , 2012, NeuroImage.

[23]  Oili Salonen,et al.  Activation in parietal operculum parallels motor recovery in stroke , 2012, Human brain mapping.

[24]  W. Prinz,et al.  Movements, actions and tool-use actions: an ideomotor approach to imitation , 2009, Philosophical Transactions of the Royal Society B: Biological Sciences.

[25]  G. Aschersleben,et al.  The Theory of Event Coding (TEC): a framework for perception and action planning. , 2001, The Behavioral and brain sciences.

[26]  Stephan P. Swinnen,et al.  Is the human primary motor cortex activated by muscular or direction-dependent features of observed movements? , 2009, Cortex.

[27]  C. Heyes,et al.  What Is the Significance of Imitation in Animals , 2000 .

[28]  J. Mazziotta,et al.  Modulation of cortical activity during different imitative behaviors. , 2003, Journal of neurophysiology.

[29]  R. Wise,et al.  Separate Areas for Mirror Responses and Agency within the Parietal Operculum , 2008, The Journal of Neuroscience.

[30]  Mark Hallett,et al.  Impaired inhibition in writer's cramp during voluntary muscle activation , 1997, Neurology.

[31]  J. R. Simon,et al.  Reactions toward the source of stimulation. , 1969, Journal of experimental psychology.

[32]  R. C. Oldfield.  The assessment and analysis of handedness: the Edinburgh inventory. , 1971, Neuropsychologia.

[33]  A. Meltzoff,et al.  An fMRI study of imitation: action representation and body schema , 2005, Neuropsychologia.

[34]  W. Prinz.  Perception and Action Planning , 1997 .

[35]  Takashi Hanakawa,et al.  Differential effect of double-pulse TMS applied to dorsal premotor cortex and precuneus during internal operation of visuospatial information , 2010, NeuroImage.