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3D visualization of movements can amplify motor cortex activation during subsequent motor imagery.

Sollfrank T, Hart D, Goodsell R, Foster J, Tan T - Front Hum Neurosci (2015)

Bottom Line: We hypothesized that a richer sensory visualization might be more effective during instrumental conditioning, resulting in a more pronounced event related desynchronization (ERD) of the upper alpha band (10-12 Hz) over the sensorimotor cortices thereby potentially improving MI based brain-computer interface (BCI) protocols for motor rehabilitation.The largest upper alpha band power decrease was obtained during MI after a 3-dimensional visualization.Realistic visual feedback, consistent with the participant's MI, might be helpful for accomplishing successful MI and the use of such feedback may assist in making BCI a more natural interface for MI based BCI rehabilitation.

View Article: PubMed Central - PubMed

Affiliation: Department of Psychology I, Institute of Psychology, University of Würzburg Würzburg, Germany.

ABSTRACT
A repetitive movement practice by motor imagery (MI) can influence motor cortical excitability in the electroencephalogram (EEG). This study investigated if a realistic visualization in 3D of upper and lower limb movements can amplify motor related potentials during subsequent MI. We hypothesized that a richer sensory visualization might be more effective during instrumental conditioning, resulting in a more pronounced event related desynchronization (ERD) of the upper alpha band (10-12 Hz) over the sensorimotor cortices thereby potentially improving MI based brain-computer interface (BCI) protocols for motor rehabilitation. The results show a strong increase of the characteristic patterns of ERD of the upper alpha band components for left and right limb MI present over the sensorimotor areas in both visualization conditions. Overall, significant differences were observed as a function of visualization modality (VM; 2D vs. 3D). The largest upper alpha band power decrease was obtained during MI after a 3-dimensional visualization. In total in 12 out of 20 tasks the end-user of the 3D visualization group showed an enhanced upper alpha ERD relative to 2D VM group, with statistical significance in nine tasks.With a realistic visualization of the limb movements, we tried to increase motor cortex activation during subsequent MI. The feedback and the feedback environment should be inherently motivating and relevant for the learner and should have an appeal of novelty, real-world relevance or aesthetic value (Ryan and Deci, 2000; Merrill, 2007). Realistic visual feedback, consistent with the participant's MI, might be helpful for accomplishing successful MI and the use of such feedback may assist in making BCI a more natural interface for MI based BCI rehabilitation.

No MeSH data available.


Related in: MedlinePlus

Visualization of five different limb movements: wrist movement, elbow rotation, arm flexion, knee and ankle rotation. All movements were shown for the left and right limb, except the ankle rotation which showed both feet rotating simultaneously. All videos were displayed randomized in 2D and 3D.
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Figure 1: Visualization of five different limb movements: wrist movement, elbow rotation, arm flexion, knee and ankle rotation. All movements were shown for the left and right limb, except the ankle rotation which showed both feet rotating simultaneously. All videos were displayed randomized in 2D and 3D.

Mentions: Participants were seated in a comfortable chair directly in front of a True3Di 24″ SDM-240M Stereoscopic 3D Monitor wearing stereoscopic glasses. Each participant’s chin lay on a pre-assembled chin holder. Participants were instructed to sit in a relaxed posture with their eyes open and avoiding any eye and body movements. Using a within subjects design, all participants were instructed to watch attentively 18 randomized videos of different limb movements for the left and right body part that were presented on a stereoscopic screen. Videos were displayed in 2D and 3D (Figure 1), portraying the following movements of computer-generated models: rotation of the wrist, elbow, knees and ankle anteriorly and an arm flexion towards the spectator. The videos displayed the movements from the perspective of the participant to encourage the feeling that each participant was moving their own limbs. At the end of each video a 6 s recording phase started, with a blank screen being presented during this phase. During this recording period, participants were requested to replicate subsequently the just observed movement by MI. The task was to perform a kinesthetic rather than visual MI (Neuper et al., 2005). Instructions were important during this experiment, as the participants only received offline feedback. Participants were instructed to feel the just observed motion in their muscles and they should vividly remember a situation in which they performed a given movement before imagining it during the subsequent BCI use. This should activate their prior experience with the task they will imagine, which is expected to make the learning easier (Merrill, 2007). Data collection lasted 45 min, with participants performing three runs of 10 min each, with 5 min breaks between each run.


3D visualization of movements can amplify motor cortex activation during subsequent motor imagery.

Sollfrank T, Hart D, Goodsell R, Foster J, Tan T - Front Hum Neurosci (2015)

Visualization of five different limb movements: wrist movement, elbow rotation, arm flexion, knee and ankle rotation. All movements were shown for the left and right limb, except the ankle rotation which showed both feet rotating simultaneously. All videos were displayed randomized in 2D and 3D.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4542583&req=5

Figure 1: Visualization of five different limb movements: wrist movement, elbow rotation, arm flexion, knee and ankle rotation. All movements were shown for the left and right limb, except the ankle rotation which showed both feet rotating simultaneously. All videos were displayed randomized in 2D and 3D.
Mentions: Participants were seated in a comfortable chair directly in front of a True3Di 24″ SDM-240M Stereoscopic 3D Monitor wearing stereoscopic glasses. Each participant’s chin lay on a pre-assembled chin holder. Participants were instructed to sit in a relaxed posture with their eyes open and avoiding any eye and body movements. Using a within subjects design, all participants were instructed to watch attentively 18 randomized videos of different limb movements for the left and right body part that were presented on a stereoscopic screen. Videos were displayed in 2D and 3D (Figure 1), portraying the following movements of computer-generated models: rotation of the wrist, elbow, knees and ankle anteriorly and an arm flexion towards the spectator. The videos displayed the movements from the perspective of the participant to encourage the feeling that each participant was moving their own limbs. At the end of each video a 6 s recording phase started, with a blank screen being presented during this phase. During this recording period, participants were requested to replicate subsequently the just observed movement by MI. The task was to perform a kinesthetic rather than visual MI (Neuper et al., 2005). Instructions were important during this experiment, as the participants only received offline feedback. Participants were instructed to feel the just observed motion in their muscles and they should vividly remember a situation in which they performed a given movement before imagining it during the subsequent BCI use. This should activate their prior experience with the task they will imagine, which is expected to make the learning easier (Merrill, 2007). Data collection lasted 45 min, with participants performing three runs of 10 min each, with 5 min breaks between each run.

Bottom Line: We hypothesized that a richer sensory visualization might be more effective during instrumental conditioning, resulting in a more pronounced event related desynchronization (ERD) of the upper alpha band (10-12 Hz) over the sensorimotor cortices thereby potentially improving MI based brain-computer interface (BCI) protocols for motor rehabilitation.The largest upper alpha band power decrease was obtained during MI after a 3-dimensional visualization.Realistic visual feedback, consistent with the participant's MI, might be helpful for accomplishing successful MI and the use of such feedback may assist in making BCI a more natural interface for MI based BCI rehabilitation.

View Article: PubMed Central - PubMed

Affiliation: Department of Psychology I, Institute of Psychology, University of Würzburg Würzburg, Germany.

ABSTRACT
A repetitive movement practice by motor imagery (MI) can influence motor cortical excitability in the electroencephalogram (EEG). This study investigated if a realistic visualization in 3D of upper and lower limb movements can amplify motor related potentials during subsequent MI. We hypothesized that a richer sensory visualization might be more effective during instrumental conditioning, resulting in a more pronounced event related desynchronization (ERD) of the upper alpha band (10-12 Hz) over the sensorimotor cortices thereby potentially improving MI based brain-computer interface (BCI) protocols for motor rehabilitation. The results show a strong increase of the characteristic patterns of ERD of the upper alpha band components for left and right limb MI present over the sensorimotor areas in both visualization conditions. Overall, significant differences were observed as a function of visualization modality (VM; 2D vs. 3D). The largest upper alpha band power decrease was obtained during MI after a 3-dimensional visualization. In total in 12 out of 20 tasks the end-user of the 3D visualization group showed an enhanced upper alpha ERD relative to 2D VM group, with statistical significance in nine tasks.With a realistic visualization of the limb movements, we tried to increase motor cortex activation during subsequent MI. The feedback and the feedback environment should be inherently motivating and relevant for the learner and should have an appeal of novelty, real-world relevance or aesthetic value (Ryan and Deci, 2000; Merrill, 2007). Realistic visual feedback, consistent with the participant's MI, might be helpful for accomplishing successful MI and the use of such feedback may assist in making BCI a more natural interface for MI based BCI rehabilitation.

No MeSH data available.


Related in: MedlinePlus