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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 distribution of decoding accuracies averaged over subjects.Significant decoding accuracies were observed after response onset at the medial part of cM1, particularly around hand and arm areas, during both real and imagined movements. Decoding accuracy was plotted for the first sample acquired in the time window. Virtual channels with significant accuracies are marked with an “x” (binomial test, p < 0.01). A, anterior; L, lateral; M, medial; P, posterior.
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f3: Spatial distribution of decoding accuracies averaged over subjects.Significant decoding accuracies were observed after response onset at the medial part of cM1, particularly around hand and arm areas, during both real and imagined movements. Decoding accuracy was plotted for the first sample acquired in the time window. Virtual channels with significant accuracies are marked with an “x” (binomial test, p < 0.01). A, anterior; L, lateral; M, medial; P, posterior.

Mentions: In addition, the decoding analysis based on a single virtual channel showed a gradual and significant increase of decoding accuracy around the medial part of cM1 in line with response onset in both real and imagined movements (binomial test, p < 0.01) (Fig. 3 and Supplementary movie 1, 2). Further, decoding accuracy increased around the medial part of cS1 corresponding to the response onset for both real and imagined movements (Supplementary movie 3 and 4).


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 distribution of decoding accuracies averaged over subjects.Significant decoding accuracies were observed after response onset at the medial part of cM1, particularly around hand and arm areas, during both real and imagined movements. Decoding accuracy was plotted for the first sample acquired in the time window. Virtual channels with significant accuracies are marked with an “x” (binomial test, p < 0.01). A, anterior; L, lateral; M, medial; P, posterior.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f3: Spatial distribution of decoding accuracies averaged over subjects.Significant decoding accuracies were observed after response onset at the medial part of cM1, particularly around hand and arm areas, during both real and imagined movements. Decoding accuracy was plotted for the first sample acquired in the time window. Virtual channels with significant accuracies are marked with an “x” (binomial test, p < 0.01). A, anterior; L, lateral; M, medial; P, posterior.
Mentions: In addition, the decoding analysis based on a single virtual channel showed a gradual and significant increase of decoding accuracy around the medial part of cM1 in line with response onset in both real and imagined movements (binomial test, p < 0.01) (Fig. 3 and Supplementary movie 1, 2). Further, decoding accuracy increased around the medial part of cS1 corresponding to the response onset for both real and imagined movements (Supplementary movie 3 and 4).

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