Muthukumaraswamy, Suresh Daniel ![]() |
Abstract
In this experiment, the oscillatory responses of the MEG were characterized during the observation of four viewing conditions: (a) observation of mouth movements, (b) observation of a non-biological motion stimulus (a mechanical aperture opening and shutting), (c) observation of object-directed mouth movements and (d) observation of speech-like mouth movements. Data were analyzed using synthetic aperture magnetometry (SAM) in three frequency bands, beta (15–35 Hz), gamma (35–70 Hz) and alpha/mu (8–15 Hz). Results showed that observations of biological motion resulted in beta desynchronization over lateral sensorimotor areas, while observations of non-biological motion resulted in a more medial desynchronization, an effect that may be related to the processing of a structured event sequence. Observation of linguistic movements resulted in less alpha/beta desynchronization in posterior brain regions in comparison to biological motion stimuli, suggesting that linguistically-relevant stimuli are processed with different neuronal systems than those recruited by normal action observation. We suggest that non-linguistic actions recruit dorsal systems while linguistic actions engage ventral processing systems. Object-directed movements showed the largest sensorimotor activations, suggesting that, as is the case for observations of hand movements, motoric processing is particularly sensitive to the viewing of goal-directed actions. Taken together, the results indicate that the brain utilizes multiple action encoding strategies, tailored to the function of the observed movement.
Item Type: | Article |
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Date Type: | Publication |
Status: | Published |
Schools: | Psychology |
Subjects: | R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry |
Uncontrolled Keywords: | Synthetic aperture magnetometry; Magnetoencephalography; Biological motion; Mirror neuron; Action observation; Beta rhythm |
Publisher: | Elsevier |
ISSN: | 0006-8993 |
Last Modified: | 20 Oct 2022 07:51 |
URI: | https://orca.cardiff.ac.uk/id/eprint/26628 |
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