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Common neural correlates of real and imagined movements contributing to the performance of brain-machine interfaces.

Sugata H, Hirata M, Yanagisawa T, Matsushita K, Yorifuji S, Yoshimine T - Sci Rep (2016)

Bottom Line: Similarly, although decoding accuracies surpassed the chance level in both real and imagined movements, these were significantly different after the onset.The temporal correlation of decoding accuracy significantly increased around the hand and arm areas, except for the period immediately after response onset.Our results suggest that cM1 is involved in similar neural activities related to the representation of motor information during real and imagined movements, except for presence or absence of sensory-motor integration induced by sensory feedback.

View Article: PubMed Central - PubMed

Affiliation: Department of Neurosurgery, Osaka University Medical School, 2-2 Yamadaoka, Osaka, 565-0871, Japan.

ABSTRACT
The relationship between M1 activity representing motor information in real and imagined movements have not been investigated with high spatiotemporal resolution using non-invasive measurements. We examined the similarities and differences in M1 activity during real and imagined movements. Ten subjects performed or imagined three types of right upper limb movements. To infer the movement type, we used 40 virtual channels in the M1 contralateral to the movement side (cM1) using a beamforming approach. For both real and imagined movements, cM1 activities increased around response onset, after which their intensities were significantly different. Similarly, although decoding accuracies surpassed the chance level in both real and imagined movements, these were significantly different after the onset. Single virtual channel-based analysis showed that decoding accuracy significantly increased around the hand and arm areas during real and imagined movements and that these are spatially correlated. The temporal correlation of decoding accuracy significantly increased around the hand and arm areas, except for the period immediately after response onset. Our results suggest that cM1 is involved in similar neural activities related to the representation of motor information during real and imagined movements, except for presence or absence of sensory-motor integration induced by sensory feedback.

No MeSH data available.


Related in: MedlinePlus

Spatial correlation of decoding accuracies between real and imagined movements averaged over subjects.Significant spatial correlations were observed around response onset (Pearson’s test, *p < 0.05) (error bar, SD).
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f4: Spatial correlation of decoding accuracies between real and imagined movements averaged over subjects.Significant spatial correlations were observed around response onset (Pearson’s test, *p < 0.05) (error bar, SD).

Mentions: To examine the relationship between cM1 activity representing motor information in real and imagined movements, we calculated the spatial correlation of decoding accuracy between both movements at each time point. Figure 4 depicts the time course of the averaged spatial correlations. The correlation coefficients significantly increased from −100 to 300 ms (Pearson’s correlation test, p < 0.05). A similar result was also observed in cS1 from 100 to 300 ms but not in the other six ROIs (Fig. S8).


Common neural correlates of real and imagined movements contributing to the performance of brain-machine interfaces.

Sugata H, Hirata M, Yanagisawa T, Matsushita K, Yorifuji S, Yoshimine T - Sci Rep (2016)

Spatial correlation of decoding accuracies between real and imagined movements averaged over subjects.Significant spatial correlations were observed around response onset (Pearson’s test, *p < 0.05) (error bar, SD).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4835797&req=5

f4: Spatial correlation of decoding accuracies between real and imagined movements averaged over subjects.Significant spatial correlations were observed around response onset (Pearson’s test, *p < 0.05) (error bar, SD).
Mentions: To examine the relationship between cM1 activity representing motor information in real and imagined movements, we calculated the spatial correlation of decoding accuracy between both movements at each time point. Figure 4 depicts the time course of the averaged spatial correlations. The correlation coefficients significantly increased from −100 to 300 ms (Pearson’s correlation test, p < 0.05). A similar result was also observed in cS1 from 100 to 300 ms but not in the other six ROIs (Fig. S8).

Bottom Line: Similarly, although decoding accuracies surpassed the chance level in both real and imagined movements, these were significantly different after the onset.The temporal correlation of decoding accuracy significantly increased around the hand and arm areas, except for the period immediately after response onset.Our results suggest that cM1 is involved in similar neural activities related to the representation of motor information during real and imagined movements, except for presence or absence of sensory-motor integration induced by sensory feedback.

View Article: PubMed Central - PubMed

Affiliation: Department of Neurosurgery, Osaka University Medical School, 2-2 Yamadaoka, Osaka, 565-0871, Japan.

ABSTRACT
The relationship between M1 activity representing motor information in real and imagined movements have not been investigated with high spatiotemporal resolution using non-invasive measurements. We examined the similarities and differences in M1 activity during real and imagined movements. Ten subjects performed or imagined three types of right upper limb movements. To infer the movement type, we used 40 virtual channels in the M1 contralateral to the movement side (cM1) using a beamforming approach. For both real and imagined movements, cM1 activities increased around response onset, after which their intensities were significantly different. Similarly, although decoding accuracies surpassed the chance level in both real and imagined movements, these were significantly different after the onset. Single virtual channel-based analysis showed that decoding accuracy significantly increased around the hand and arm areas during real and imagined movements and that these are spatially correlated. The temporal correlation of decoding accuracy significantly increased around the hand and arm areas, except for the period immediately after response onset. Our results suggest that cM1 is involved in similar neural activities related to the representation of motor information during real and imagined movements, except for presence or absence of sensory-motor integration induced by sensory feedback.

No MeSH data available.


Related in: MedlinePlus