title: Observed manipulation of novel tools leads to mu rhythm suppression over sensory-motor cortices.
abstract: Tool stimuli can be analyzed based on their affordance, that is, their visual structure hinting at possible interaction points. Additionally, familiar tools can initiate the retrieval of stored object-action associations, providing the basis for a meaningful object use. The mu rhythm within the electroencephalographic alpha band is associated with sensory-motor processing and was shown to be modulated during the sight of familiar tool stimuli, suggesting motor cortex activation based on either affordance processing or access to stored conceptual object-action associations. The current study aimed to investigate the impact of such associations, acquired by observation of manipulation, in a training study controlling for inherent object affordances and previous individual differences in object-related experience. Participants observed the manipulation of a set of novel tool objects and visually explored a second set of novel tools for which only functional information was provided. In contrast to non-trained objects, observed objects modulated the mu rhythm over left sensory-motor cortex within 200 ms after training. Additionally, both observed and visually explored objects modulated mu rhythm over right sensory-motor cortex in the same time window to some extent, with the effect being stronger for the latter. This result suggests that motor cortex activation in visual processing of tools can result from observation of tool manipulation. However, mu rhythm modulation, albeit with a different and less clear left-lateralized pattern, is also seen when the tools were only made visually familiar and when information was restricted to the tools function.
authors.affiliation: Institute of Cognitive Neuroscience, Department of Neuropsychology, Faculty of Psychology, Ruhr-University Bochum, Universitaetsstrasse 150, 44801 Bochum, Germany; International Graduate School of Neuroscience, Ruhr-University Bochum, Universitaetsstrasse 150, 44801 Bochum, Germany. Electronic address: naima.ruether@rub.de.
authors.forename: Norma Naima
authors.initials: NN
authors.lastname: Rüther
authors.affiliation: International Graduate School of Neuroscience, Ruhr-University Bochum, Universitaetsstrasse 150, 44801 Bochum, Germany; Maryland Psychiatric Research Centre, University of Maryland School of Medicine, 55 Wade Avenue, Baltimore, MD 21228, USA.
authors.forename: Elliot Clayton
authors.initials: EC
authors.lastname: Brown
authors.affiliation: Institute of Clinical Neuroscience and Medical Psychology, Medical Faculty, Heinrich Heine University Düsseldorf, Universitaetsstrasse 1, 40225 Düsseldorf, Germany.
authors.forename: Anne
authors.initials: A
authors.lastname: Klepp
authors.affiliation: Institute of Experimental Psychology, Heinrich Heine University Düsseldorf, Universitaetsstrasse 1, 40225 Düsseldorf, Germany.
authors.forename: Christian
authors.initials: C
authors.lastname: Bellebaum
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D001931:Brain Mapping; D058256:Brain Waves / Q000502:physiology*; D004569:Electroencephalography; D005260:Female; D007839:Functional Laterality; D006801:Humans; D008297:Male; D009044:Motor Cortex / Q000502:physiology*; D019370:Observation; D010775:Photic Stimulation; D011597:Psychomotor Performance / Q000502:physiology*; D011930:Reaction Time / Q000502:physiology; D055815:Young Adult
keywords: Action; Affordance; Mu rhythm; Observation; Tools; Training