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Long-Lasting Cortical Reorganization as the Result of Motor Imagery of Throwing a Ball in a Virtual Tennis Court.

Cebolla AM, Petieau M, Cevallos C, Leroy A, Dan B, Cheron G - Front Psychol (2015)

Bottom Line: The N300 component was centrally localized on the scalp and was accompanied by significant phase consistency in the delta brain rhythms in the contralateral central scalp areas.The N1000 component spread wider centrally and was accompanied by a significant power decrease (or event related desynchronization) in low beta brain rhythms localized in fronto-precentral and parieto-occipital scalp areas and also by a significant power increase (or event related synchronization) in theta brain rhythms spreading fronto-centrally.The visual representation of movement formed in the minds of participants might underlie a top-down process from the fronto-central areas which is reflected by the amplitude changes observed in the fronto-central ERPs and by the significant phase synchrony in contralateral fronto-central delta and contralateral central mu to parietal theta presented here.

View Article: PubMed Central - PubMed

Affiliation: Laboratory of Neurophysiology and Movement Biomechanics, ULB Neuroscience Institute, Université Libre de Bruxelles , Brussels, Belgium.

ABSTRACT
In order to characterize the neural signature of a motor imagery (MI) task, the present study investigates for the first time the oscillation characteristics including both of the time-frequency measurements, event related spectral perturbation and intertrial coherence (ITC) underlying the variations in the temporal measurements (event related potentials, ERP) directly related to a MI task. We hypothesize that significant variations in both of the time-frequency measurements underlie the specific changes in the ERP directly related to MI. For the MI task, we chose a simple everyday task (throwing a tennis ball), that does not require any particular motor expertise, set within the controlled virtual reality scenario of a tennis court. When compared to the rest condition a consistent, long-lasting negative fronto-central ERP wave was accompanied by significant changes in both time frequency measurements suggesting long-lasting cortical activity reorganization. The ERP wave was characterized by two peaks at about 300 ms (N300) and 1000 ms (N1000). The N300 component was centrally localized on the scalp and was accompanied by significant phase consistency in the delta brain rhythms in the contralateral central scalp areas. The N1000 component spread wider centrally and was accompanied by a significant power decrease (or event related desynchronization) in low beta brain rhythms localized in fronto-precentral and parieto-occipital scalp areas and also by a significant power increase (or event related synchronization) in theta brain rhythms spreading fronto-centrally. During the transition from N300 to N1000, a contralateral alpha (mu) as well as post-central and parieto-theta rhythms occurred. The visual representation of movement formed in the minds of participants might underlie a top-down process from the fronto-central areas which is reflected by the amplitude changes observed in the fronto-central ERPs and by the significant phase synchrony in contralateral fronto-central delta and contralateral central mu to parietal theta presented here.

No MeSH data available.


Related in: MedlinePlus

ERPs. (A) Grand average (n = 11) in full scalp array for the rest (black traces) and for the motor imagery of throwing (red traces). (B) ERP in POz: the classical visual P100–N150 complex is indicated with open arrows. ERP in representative electrode FCz: Note the negative wave characterized by a N300 and N1000 in the motor imagery of throwing condition. (C) Scalp potential topography of the N300 and N1000 components in both rest (left) and motor imagery of throwing (middle) conditions and their statistical differences (right; p > 0.05). Note that there is no special right or left laterality.
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Figure 2: ERPs. (A) Grand average (n = 11) in full scalp array for the rest (black traces) and for the motor imagery of throwing (red traces). (B) ERP in POz: the classical visual P100–N150 complex is indicated with open arrows. ERP in representative electrode FCz: Note the negative wave characterized by a N300 and N1000 in the motor imagery of throwing condition. (C) Scalp potential topography of the N300 and N1000 components in both rest (left) and motor imagery of throwing (middle) conditions and their statistical differences (right; p > 0.05). Note that there is no special right or left laterality.

Mentions: Parietal and occipital ERPs of both conditions (“throw” and “rest”) showed similar visual P100-N150 complex elicited by the target’s appearance on the screen with no significant differences (p = 0.45 and p = 0.50, respectively; P100 of 113.3 ± 5.6 ms and 1.4 ± 1.2 μV, N150 of 152.1 ± 8.9 ms and 3.6 ± 1.7 μV in the “throw” condition versus P100 of 111.3 ± 8.2 ms and 0.85 ± 0.9 μV, N150 of 152.3 ± 10.2 ms and 3.5 ± 1.2 μV in the “rest” condition in POz; Figures 2A,B, empty arrows). Analogous to the parieto-occipital visual complex, a positive P200 was observed in the fronto-central areas, and presented no significant difference (p = 0.06) between conditions (with latencies of 224.6 ± 9.1 ms and 209.0 ± 9.0 ms and amplitudes of 5.6 ± 3.9 and 7.1 ± 2.9 μV in FCz for “throw MI” and “rest” conditions, respectively). Interestingly, ERPs showed a sustained stronger fronto-central negativity wave in the “throw MI” condition with respect to the “rest” condition. This is illustrated in the grand average ERP for the whole EEG electrodes montage (Figure 2A) and for one representative electrode, FCz (Figure 2B where the black horizontal bar indicates the duration of the amplitude significant difference for p < 0.05). Such negativity was characterized by two minima at around 300 ms (N300) and around 1000 ms (N1000; Figure 2B, black arrows; latencies of 320.3 ± 39.6 ms and 1021.0 ± 60.7 ms in FCz) with significant (p > 0.05) stronger amplitudes than the “rest” condition (–6.1 ± 3.3 μV versus –2.1 ± 2.8 μV and –6.8 ± 3.9 μV versus 2.5 ± 4.0 μV for N300 and N1000, respectively with p = 0.001 and p = 0.002, respectively; Figures 2B,C). The N300 component showed a more restricted central localisation than the N1000 component, which expanded to the frontal and postcentral areas as illustrated in the topographical potential distribution maps (Figure 2C). N300 and N1000 components did not show either left or right laterality (Figure 2C).


Long-Lasting Cortical Reorganization as the Result of Motor Imagery of Throwing a Ball in a Virtual Tennis Court.

Cebolla AM, Petieau M, Cevallos C, Leroy A, Dan B, Cheron G - Front Psychol (2015)

ERPs. (A) Grand average (n = 11) in full scalp array for the rest (black traces) and for the motor imagery of throwing (red traces). (B) ERP in POz: the classical visual P100–N150 complex is indicated with open arrows. ERP in representative electrode FCz: Note the negative wave characterized by a N300 and N1000 in the motor imagery of throwing condition. (C) Scalp potential topography of the N300 and N1000 components in both rest (left) and motor imagery of throwing (middle) conditions and their statistical differences (right; p > 0.05). Note that there is no special right or left laterality.
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Figure 2: ERPs. (A) Grand average (n = 11) in full scalp array for the rest (black traces) and for the motor imagery of throwing (red traces). (B) ERP in POz: the classical visual P100–N150 complex is indicated with open arrows. ERP in representative electrode FCz: Note the negative wave characterized by a N300 and N1000 in the motor imagery of throwing condition. (C) Scalp potential topography of the N300 and N1000 components in both rest (left) and motor imagery of throwing (middle) conditions and their statistical differences (right; p > 0.05). Note that there is no special right or left laterality.
Mentions: Parietal and occipital ERPs of both conditions (“throw” and “rest”) showed similar visual P100-N150 complex elicited by the target’s appearance on the screen with no significant differences (p = 0.45 and p = 0.50, respectively; P100 of 113.3 ± 5.6 ms and 1.4 ± 1.2 μV, N150 of 152.1 ± 8.9 ms and 3.6 ± 1.7 μV in the “throw” condition versus P100 of 111.3 ± 8.2 ms and 0.85 ± 0.9 μV, N150 of 152.3 ± 10.2 ms and 3.5 ± 1.2 μV in the “rest” condition in POz; Figures 2A,B, empty arrows). Analogous to the parieto-occipital visual complex, a positive P200 was observed in the fronto-central areas, and presented no significant difference (p = 0.06) between conditions (with latencies of 224.6 ± 9.1 ms and 209.0 ± 9.0 ms and amplitudes of 5.6 ± 3.9 and 7.1 ± 2.9 μV in FCz for “throw MI” and “rest” conditions, respectively). Interestingly, ERPs showed a sustained stronger fronto-central negativity wave in the “throw MI” condition with respect to the “rest” condition. This is illustrated in the grand average ERP for the whole EEG electrodes montage (Figure 2A) and for one representative electrode, FCz (Figure 2B where the black horizontal bar indicates the duration of the amplitude significant difference for p < 0.05). Such negativity was characterized by two minima at around 300 ms (N300) and around 1000 ms (N1000; Figure 2B, black arrows; latencies of 320.3 ± 39.6 ms and 1021.0 ± 60.7 ms in FCz) with significant (p > 0.05) stronger amplitudes than the “rest” condition (–6.1 ± 3.3 μV versus –2.1 ± 2.8 μV and –6.8 ± 3.9 μV versus 2.5 ± 4.0 μV for N300 and N1000, respectively with p = 0.001 and p = 0.002, respectively; Figures 2B,C). The N300 component showed a more restricted central localisation than the N1000 component, which expanded to the frontal and postcentral areas as illustrated in the topographical potential distribution maps (Figure 2C). N300 and N1000 components did not show either left or right laterality (Figure 2C).

Bottom Line: The N300 component was centrally localized on the scalp and was accompanied by significant phase consistency in the delta brain rhythms in the contralateral central scalp areas.The N1000 component spread wider centrally and was accompanied by a significant power decrease (or event related desynchronization) in low beta brain rhythms localized in fronto-precentral and parieto-occipital scalp areas and also by a significant power increase (or event related synchronization) in theta brain rhythms spreading fronto-centrally.The visual representation of movement formed in the minds of participants might underlie a top-down process from the fronto-central areas which is reflected by the amplitude changes observed in the fronto-central ERPs and by the significant phase synchrony in contralateral fronto-central delta and contralateral central mu to parietal theta presented here.

View Article: PubMed Central - PubMed

Affiliation: Laboratory of Neurophysiology and Movement Biomechanics, ULB Neuroscience Institute, Université Libre de Bruxelles , Brussels, Belgium.

ABSTRACT
In order to characterize the neural signature of a motor imagery (MI) task, the present study investigates for the first time the oscillation characteristics including both of the time-frequency measurements, event related spectral perturbation and intertrial coherence (ITC) underlying the variations in the temporal measurements (event related potentials, ERP) directly related to a MI task. We hypothesize that significant variations in both of the time-frequency measurements underlie the specific changes in the ERP directly related to MI. For the MI task, we chose a simple everyday task (throwing a tennis ball), that does not require any particular motor expertise, set within the controlled virtual reality scenario of a tennis court. When compared to the rest condition a consistent, long-lasting negative fronto-central ERP wave was accompanied by significant changes in both time frequency measurements suggesting long-lasting cortical activity reorganization. The ERP wave was characterized by two peaks at about 300 ms (N300) and 1000 ms (N1000). The N300 component was centrally localized on the scalp and was accompanied by significant phase consistency in the delta brain rhythms in the contralateral central scalp areas. The N1000 component spread wider centrally and was accompanied by a significant power decrease (or event related desynchronization) in low beta brain rhythms localized in fronto-precentral and parieto-occipital scalp areas and also by a significant power increase (or event related synchronization) in theta brain rhythms spreading fronto-centrally. During the transition from N300 to N1000, a contralateral alpha (mu) as well as post-central and parieto-theta rhythms occurred. The visual representation of movement formed in the minds of participants might underlie a top-down process from the fronto-central areas which is reflected by the amplitude changes observed in the fronto-central ERPs and by the significant phase synchrony in contralateral fronto-central delta and contralateral central mu to parietal theta presented here.

No MeSH data available.


Related in: MedlinePlus