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Brain oscillatory activity during motor preparation: effect of directional uncertainty on beta, but not alpha, frequency band.

Tzagarakis C, West S, Pellizzer G - Front Neurosci (2015)

Bottom Line: During cue presentation, the reduction of power of the alpha-band in the occipital lobe showed a brief differentiation of condition: the wider the visual cue, the more the power of the alpha-band decreased.However, during motor preparation, only the power of the beta-band was dependent on directional uncertainty: the less the directional uncertainty, the more the power of the beta-band decreased.In conclusion, the results indicate that the power in the alpha-band is associated briefly with cue size, but is otherwise an undifferentiated indication of neural activation, whereas the power of the beta-band reflects the level of motor preparation.

View Article: PubMed Central - PubMed

Affiliation: Brain Sciences Center, Veterans Affairs Health Care Service Minneapolis, MN, USA ; Department of Neuroscience, University of Minnesota Minneapolis, MN, USA.

ABSTRACT
In time-constraint activities, such as sports, it is advantageous to be prepared to act even before knowing precisely what action will be needed. Here, we studied the relation between neural oscillations during motor preparation and amount of uncertainty about the direction of the upcoming target. Ten right-handed volunteers participated in a cued center-out task. A brief visual cue identified the region of space in which the target would appear. Three cue sizes were used to vary the amount of information about the direction of the upcoming target. The target appeared at a random location within the region indicated by the cue, and the participants moved a joystick-controlled cursor toward it. Time-frequency analyses showed phasic increases of power in low (delta/theta: <7 Hz) and high (gamma: >30 Hz) frequency-bands in relation to the onset of visual stimuli and of the motor response. More importantly in regard to motor preparation, there was a tonic reduction of power in the alpha (8-12 Hz) and beta (14-30 Hz) bands during the period between cue presentation and target onset. During motor preparation, the main source of change of power of the alpha band was localized over the contralateral sensorimotor region and both parietal cortices, whereas for the beta-band the main source was the contralateral sensorimotor region. During cue presentation, the reduction of power of the alpha-band in the occipital lobe showed a brief differentiation of condition: the wider the visual cue, the more the power of the alpha-band decreased. However, during motor preparation, only the power of the beta-band was dependent on directional uncertainty: the less the directional uncertainty, the more the power of the beta-band decreased. In conclusion, the results indicate that the power in the alpha-band is associated briefly with cue size, but is otherwise an undifferentiated indication of neural activation, whereas the power of the beta-band reflects the level of motor preparation.

No MeSH data available.


Source localization of alpha and beta change in power during the delay period of the task. The source of power change was estimated using the DICS beamformer method. The colored cortical regions were significantly different than baseline (cluster-based permutation test, p = 0.05).
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Figure 3: Source localization of alpha and beta change in power during the delay period of the task. The source of power change was estimated using the DICS beamformer method. The colored cortical regions were significantly different than baseline (cluster-based permutation test, p = 0.05).

Mentions: We estimated the source of change of the alpha- and beta-bands during the delay period using DICS beamforming. The cortical areas significantly different from baseline are illustrated in Figure 3. The regions that contributed mostly to the decrease in power of the alpha-band were the left and right superior parietal cortices, including the precunei, the right inferior parietal cortex, and the left pre- and post-central gyri. Other regions of change in alpha-band included the right temporal lobe, the left inferior parietal cortex, and the left and right superior occipital gyri.


Brain oscillatory activity during motor preparation: effect of directional uncertainty on beta, but not alpha, frequency band.

Tzagarakis C, West S, Pellizzer G - Front Neurosci (2015)

Source localization of alpha and beta change in power during the delay period of the task. The source of power change was estimated using the DICS beamformer method. The colored cortical regions were significantly different than baseline (cluster-based permutation test, p = 0.05).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4508519&req=5

Figure 3: Source localization of alpha and beta change in power during the delay period of the task. The source of power change was estimated using the DICS beamformer method. The colored cortical regions were significantly different than baseline (cluster-based permutation test, p = 0.05).
Mentions: We estimated the source of change of the alpha- and beta-bands during the delay period using DICS beamforming. The cortical areas significantly different from baseline are illustrated in Figure 3. The regions that contributed mostly to the decrease in power of the alpha-band were the left and right superior parietal cortices, including the precunei, the right inferior parietal cortex, and the left pre- and post-central gyri. Other regions of change in alpha-band included the right temporal lobe, the left inferior parietal cortex, and the left and right superior occipital gyri.

Bottom Line: During cue presentation, the reduction of power of the alpha-band in the occipital lobe showed a brief differentiation of condition: the wider the visual cue, the more the power of the alpha-band decreased.However, during motor preparation, only the power of the beta-band was dependent on directional uncertainty: the less the directional uncertainty, the more the power of the beta-band decreased.In conclusion, the results indicate that the power in the alpha-band is associated briefly with cue size, but is otherwise an undifferentiated indication of neural activation, whereas the power of the beta-band reflects the level of motor preparation.

View Article: PubMed Central - PubMed

Affiliation: Brain Sciences Center, Veterans Affairs Health Care Service Minneapolis, MN, USA ; Department of Neuroscience, University of Minnesota Minneapolis, MN, USA.

ABSTRACT
In time-constraint activities, such as sports, it is advantageous to be prepared to act even before knowing precisely what action will be needed. Here, we studied the relation between neural oscillations during motor preparation and amount of uncertainty about the direction of the upcoming target. Ten right-handed volunteers participated in a cued center-out task. A brief visual cue identified the region of space in which the target would appear. Three cue sizes were used to vary the amount of information about the direction of the upcoming target. The target appeared at a random location within the region indicated by the cue, and the participants moved a joystick-controlled cursor toward it. Time-frequency analyses showed phasic increases of power in low (delta/theta: <7 Hz) and high (gamma: >30 Hz) frequency-bands in relation to the onset of visual stimuli and of the motor response. More importantly in regard to motor preparation, there was a tonic reduction of power in the alpha (8-12 Hz) and beta (14-30 Hz) bands during the period between cue presentation and target onset. During motor preparation, the main source of change of power of the alpha band was localized over the contralateral sensorimotor region and both parietal cortices, whereas for the beta-band the main source was the contralateral sensorimotor region. During cue presentation, the reduction of power of the alpha-band in the occipital lobe showed a brief differentiation of condition: the wider the visual cue, the more the power of the alpha-band decreased. However, during motor preparation, only the power of the beta-band was dependent on directional uncertainty: the less the directional uncertainty, the more the power of the beta-band decreased. In conclusion, the results indicate that the power in the alpha-band is associated briefly with cue size, but is otherwise an undifferentiated indication of neural activation, whereas the power of the beta-band reflects the level of motor preparation.

No MeSH data available.