http://www.clinph-journal.com/article/S1388-2457%2813%2900120-X/abstract
Highlights
•The
observation of goal-directed movements leads to stronger event-related
desynchronization (ERD) in alpha, beta and gamma frequency bands over
parietal compared to central brain regions.
•Both
the type of grasping and the type of object induced an ERS over
sensorimotor areas in the upper alpha and lower beta band, respectively.
•Beside
the often cited MNS linked mu rhythm there is further cortical
rhythmicity over parietal sites, which might be part of an “extended”
human MNS.
Abstract
Objective
We studied the activation of cortical motor and parietal areas during the observation of object related grasping movements. By manipulating the type of an object (realistic versus abstract) and the type of grasping (correct versus incorrect), we addressed the question how observing such object related movements influences cortical rhythmicity, especially the mu-rhythm, in the context of an “extended” human mirror neuron system (MNS).Methods
Multichannel electroencephalogram (EEG) was recorded during the observation of different object-related grasping actions in twenty healthy subjects. Different movies were presented, showing sequences of correct or incorrect hand grasping actions related to an abstract or realistic (daily life) object.Results
Event-related de/synchronization (ERD/ERS) analyses revealed a larger ERD in the upper alpha (10–12
Hz), beta (16–20Hz) and gamma (36–40Hz)
frequency bands over parietal brain regions depending on the type of
grasping. The type of object only influenced ERD patterns in the gamma
band range (36–40Hz)
at parietal sites suggesting a strong relation of gamma band activity
and cortical object representation. Abstract and realistic objects
produced lower beta band synchronization at central sites only, whereas
depending on the type of grasping an ERS in the upper alpha band (10–12Hz) was observed.
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