Imitation and matching of meaningless gestures: distinct involvement from motor and visual imagery
The aim of the present study was to understand the underlying cognitive processes of imitation and matching of meaningless gestures. Neuropsychological evidence obtained in brain damaged patients, has shown that distinct cognitive processes supported imitation and matching of meaningless gestures. Left-brain damaged (LBD) patients failed to imitate while right-brain damaged (RBD) patients failed to match meaningless gestures. Moreover, other studies with brain damaged patients showed that LBD patients were impaired in motor imagery while RBD patients were impaired in visual imagery. Thus, we hypothesize that imitation of meaningless gestures might rely on motor imagery, whereas matching of meaningless gestures might be based on visual imagery. In a first experiment, using a correlational design, we demonstrated that posture imitation relies on motor imagery but not on visual imagery (Experiment 1a) and that posture matching relies on visual imagery but not on motor imagery (Experiment 1b). In a second experiment, by manipulating directly the body posture of the participants, we demonstrated that such manipulation evokes a difference only in imitation task but not in matching task. In conclusion, the present study provides direct evidence that the way we imitate or we have to compare postures depends on motor imagery or visual imagery, respectively. Our results are discussed in the light of recent findings about underlying mechanisms of meaningful and meaningless gestures.
KeywordsMental Rotation Motor Imagery Matching Task Visual Imagery Stimulus Orientation
This work was supported by grants from ANR (Agence Nationale pour la Recherche; Project Démences et Utilisation d’Outils/Dementia and Tool Use, N°ANR 2011 MALZ 006 03; D. Le Gall, F. Osiurak), and was performed within the framework of the LABEX CORTEX (ANR-11-LABX-0042) of Université de Lyon, within the program “Investissements d’Avenir” (ANR-11-IDEX-0007; F. Osiurak, J. Navarro) operated by the French National Research Agency (ANR).
- Rumiati, R. I., Carmo, J. C., & Corradi-Dell’Acqua, C. (2009). Neuropsychological perspectives on the mechanisms of imitation. Philosophical Transactions of the Royal Society of London. Series B, Biological sciences, 364(1528), 2337–2347. doi: 10.1098/rstb.2009.0063.CrossRefPubMedPubMedCentralGoogle Scholar
- Sirigu, A., Grafman, J., & Sunderland, T. (1991). Multiple representations contribute to body knowledge processing. Brain, 114, 629–642. Retrieved from papers2://publication/uuid/9A1C10D4-40AD-4D1B-9675-E1746B3C2152.Google Scholar