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Semantics in the motor system: motor-cortical Beta oscillations reflect semantic knowledge of end-postures for object use.

van Elk M, van Schie HT, van den Heuvel R, Bekkering H - Front Hum Neurosci (2010)

Bottom Line: Time frequency analysis indicated that the execution of actions resulting in a meaningless compared to a meaningful end posture was accompanied by a stronger beta-desynchronization towards the end of the movement and a stronger subsequent beta-rebound after posture-onset.The effect in the beta-frequency band was localized to premotor, parietal and medial frontal areas and could not be attributed to differences in timing or movement complexity between meaningful and meaningless actions.This suggests that semantic object knowledge is indeed represented in motor-related brain areas, organized around specific end postures associated with the use of objects.

View Article: PubMed Central - PubMed

Affiliation: Donders Institute for Brain, Cognition and Behaviour, Radboud University Nijmegen Nijmegen, Netherlands.

ABSTRACT
In the present EEG study we investigated whether semantic knowledge for object use is represented in motor-related brain areas. Subjects were required to perform actions with everyday objects and to maintain either a meaningful or a meaningless end posture with the object. Analysis of the EEG data focused on the beta-frequency band, as previous studies have indicated that the maintenance of a posture is reflected in stronger beta-oscillations. Time frequency analysis indicated that the execution of actions resulting in a meaningless compared to a meaningful end posture was accompanied by a stronger beta-desynchronization towards the end of the movement and a stronger subsequent beta-rebound after posture-onset. The effect in the beta-frequency band was localized to premotor, parietal and medial frontal areas and could not be attributed to differences in timing or movement complexity between meaningful and meaningless actions. Together these findings directly show that the motor system is differentially activated during the execution and maintenance of semantically correct or incorrect end postures. This suggests that semantic object knowledge is indeed represented in motor-related brain areas, organized around specific end postures associated with the use of objects.

No MeSH data available.


Source analysis of the beta-rebound. Source reconstructions accounting for the stronger beta-rebound for meaningless compared to meaningful actions from 1200 to 4000 ms relative to the onset of the end posture. The strongest beta modulations were observed in the superior parietal cortex [BA 6 (A)] and in the superior frontal gyrus [BA 9 (B)]. Source activation is projected on a standard brain.
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Figure 6: Source analysis of the beta-rebound. Source reconstructions accounting for the stronger beta-rebound for meaningless compared to meaningful actions from 1200 to 4000 ms relative to the onset of the end posture. The strongest beta modulations were observed in the superior parietal cortex [BA 6 (A)] and in the superior frontal gyrus [BA 9 (B)]. Source activation is projected on a standard brain.

Mentions: The sources accounting for the modulation in the beta band during the posture interval were characterized by comparing the 16–24 Hz (20 ± 4 Hz smoothing) activity during the interval from 1200 to 4000 ms after the onset of the posture, between meaningless and meaningful actions. The single subject functional data were aligned with a standard brain, averaged across subjects and thresholded for statistical significance using the cluster-level randomization procedure (Maris and Oostenveld, 2007). The strongest modulation in the beta band for meaningless compared to meaningful actions was observed in BA 6 in the superior parietal cortex (x = −10, y = −35, z = 50; see Figure 6A) and in BA 9 in the superior frontal gyrus (x = −18, y = 35, z = 46; see Figure 6B).


Semantics in the motor system: motor-cortical Beta oscillations reflect semantic knowledge of end-postures for object use.

van Elk M, van Schie HT, van den Heuvel R, Bekkering H - Front Hum Neurosci (2010)

Source analysis of the beta-rebound. Source reconstructions accounting for the stronger beta-rebound for meaningless compared to meaningful actions from 1200 to 4000 ms relative to the onset of the end posture. The strongest beta modulations were observed in the superior parietal cortex [BA 6 (A)] and in the superior frontal gyrus [BA 9 (B)]. Source activation is projected on a standard brain.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2821178&req=5

Figure 6: Source analysis of the beta-rebound. Source reconstructions accounting for the stronger beta-rebound for meaningless compared to meaningful actions from 1200 to 4000 ms relative to the onset of the end posture. The strongest beta modulations were observed in the superior parietal cortex [BA 6 (A)] and in the superior frontal gyrus [BA 9 (B)]. Source activation is projected on a standard brain.
Mentions: The sources accounting for the modulation in the beta band during the posture interval were characterized by comparing the 16–24 Hz (20 ± 4 Hz smoothing) activity during the interval from 1200 to 4000 ms after the onset of the posture, between meaningless and meaningful actions. The single subject functional data were aligned with a standard brain, averaged across subjects and thresholded for statistical significance using the cluster-level randomization procedure (Maris and Oostenveld, 2007). The strongest modulation in the beta band for meaningless compared to meaningful actions was observed in BA 6 in the superior parietal cortex (x = −10, y = −35, z = 50; see Figure 6A) and in BA 9 in the superior frontal gyrus (x = −18, y = 35, z = 46; see Figure 6B).

Bottom Line: Time frequency analysis indicated that the execution of actions resulting in a meaningless compared to a meaningful end posture was accompanied by a stronger beta-desynchronization towards the end of the movement and a stronger subsequent beta-rebound after posture-onset.The effect in the beta-frequency band was localized to premotor, parietal and medial frontal areas and could not be attributed to differences in timing or movement complexity between meaningful and meaningless actions.This suggests that semantic object knowledge is indeed represented in motor-related brain areas, organized around specific end postures associated with the use of objects.

View Article: PubMed Central - PubMed

Affiliation: Donders Institute for Brain, Cognition and Behaviour, Radboud University Nijmegen Nijmegen, Netherlands.

ABSTRACT
In the present EEG study we investigated whether semantic knowledge for object use is represented in motor-related brain areas. Subjects were required to perform actions with everyday objects and to maintain either a meaningful or a meaningless end posture with the object. Analysis of the EEG data focused on the beta-frequency band, as previous studies have indicated that the maintenance of a posture is reflected in stronger beta-oscillations. Time frequency analysis indicated that the execution of actions resulting in a meaningless compared to a meaningful end posture was accompanied by a stronger beta-desynchronization towards the end of the movement and a stronger subsequent beta-rebound after posture-onset. The effect in the beta-frequency band was localized to premotor, parietal and medial frontal areas and could not be attributed to differences in timing or movement complexity between meaningful and meaningless actions. Together these findings directly show that the motor system is differentially activated during the execution and maintenance of semantically correct or incorrect end postures. This suggests that semantic object knowledge is indeed represented in motor-related brain areas, organized around specific end postures associated with the use of objects.

No MeSH data available.