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“ Cerebellar contribution to visuo-attentional alpha rhythm: insights from weightlessness ”

View Article: PubMed Central - PubMed

ABSTRACT

Human brain adaptation in weightlessness follows the necessity to reshape the dynamic integration of the neural information acquired in the new environment. This basic aspect was here studied by the electroencephalogram (EEG) dynamics where oscillatory modulations were measured during a visuo-attentional state preceding a visuo-motor docking task. Astronauts in microgravity conducted the experiment in free-floating aboard the International Space Station, before the space flight and afterwards. We observed stronger power decrease (~ERD: event related desynchronization) of the ~10 Hz oscillation from the occipital-parietal (alpha ERD) to the central areas (mu ERD). Inverse source modelling of the stronger alpha ERD revealed a shift from the posterior cingulate cortex (BA31, from the default mode network) on Earth to the precentral cortex (BA4, primary motor cortex) in weightlessness. We also observed significant contribution of the vestibular network (BA40, BA32, and BA39) and cerebellum (lobule V, VI). We suggest that due to the high demands for the continuous readjustment of an appropriate body posture in free-floating, this visuo-attentional state required more contribution from the motor cortex. The cerebellum and the vestibular network involvement in weightlessness might support the correction signals processing necessary for postural stabilization, and the increased demand to integrate incongruent vestibular information.

No MeSH data available.


Related in: MedlinePlus

Alpha-mu ERD brain sources in Eb, W, Earthafter-early and Earthafter-late conditions during the visuo-attention period.Nonparametric statistical maps calculated on the five astronauts for the alpha-mu ERD (with respect to the classical baseline as reference period). Each column represents the three views for a same spatial coordinate. Note bilateral motor cortex (BA4) activation during W condition.
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f3: Alpha-mu ERD brain sources in Eb, W, Earthafter-early and Earthafter-late conditions during the visuo-attention period.Nonparametric statistical maps calculated on the five astronauts for the alpha-mu ERD (with respect to the classical baseline as reference period). Each column represents the three views for a same spatial coordinate. Note bilateral motor cortex (BA4) activation during W condition.

Mentions: In order to avoid the pitfalls occurring when focusing on the power spectrum topographies at the scalp level, associated with the mixing of multiple cortical processes by volume conduction23, we modelled the ERD brain sources by using the swLORETA method2425. Figure 3 illustrates the nonparametric statistical source maps plotted for all participants at the ERD alpha frequency band during the visuo-attentional period, independently for Eb, W, Earthafter-early and Earthafter-late conditions and with respect to the classical baseline as a reference period. On the ground before the flight (Eb), the maxima of alpha ERD were localized in a single midline region of the posterior cingulate cortex (BA31, left cerebrum, −9.9, −21.3, 39.9 and BA31, right cerebrum, 14.1, −27.0 and 39.1). In contrast, in a condition of weightlessness (W), the maxima were lateralized in the motor cortex on both sides (BA4, left cerebrum, −25.0, −19.9, 40.0 and BA4, right cerebrum, 28.4, −18.0, 37.6). After the flight, the single midline region of the posterior cingulate cortex was obtained once again (BA31, left cerebrum, −1.6, −29.0, 34.6 for Earthafter-early condition) and (BA31, left cerebrum, −7.5, −35.4, 35 for Earthafter-late condition).


“ Cerebellar contribution to visuo-attentional alpha rhythm: insights from weightlessness ”
Alpha-mu ERD brain sources in Eb, W, Earthafter-early and Earthafter-late conditions during the visuo-attention period.Nonparametric statistical maps calculated on the five astronauts for the alpha-mu ERD (with respect to the classical baseline as reference period). Each column represents the three views for a same spatial coordinate. Note bilateral motor cortex (BA4) activation during W condition.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5121637&req=5

f3: Alpha-mu ERD brain sources in Eb, W, Earthafter-early and Earthafter-late conditions during the visuo-attention period.Nonparametric statistical maps calculated on the five astronauts for the alpha-mu ERD (with respect to the classical baseline as reference period). Each column represents the three views for a same spatial coordinate. Note bilateral motor cortex (BA4) activation during W condition.
Mentions: In order to avoid the pitfalls occurring when focusing on the power spectrum topographies at the scalp level, associated with the mixing of multiple cortical processes by volume conduction23, we modelled the ERD brain sources by using the swLORETA method2425. Figure 3 illustrates the nonparametric statistical source maps plotted for all participants at the ERD alpha frequency band during the visuo-attentional period, independently for Eb, W, Earthafter-early and Earthafter-late conditions and with respect to the classical baseline as a reference period. On the ground before the flight (Eb), the maxima of alpha ERD were localized in a single midline region of the posterior cingulate cortex (BA31, left cerebrum, −9.9, −21.3, 39.9 and BA31, right cerebrum, 14.1, −27.0 and 39.1). In contrast, in a condition of weightlessness (W), the maxima were lateralized in the motor cortex on both sides (BA4, left cerebrum, −25.0, −19.9, 40.0 and BA4, right cerebrum, 28.4, −18.0, 37.6). After the flight, the single midline region of the posterior cingulate cortex was obtained once again (BA31, left cerebrum, −1.6, −29.0, 34.6 for Earthafter-early condition) and (BA31, left cerebrum, −7.5, −35.4, 35 for Earthafter-late condition).

View Article: PubMed Central - PubMed

ABSTRACT

Human brain adaptation in weightlessness follows the necessity to reshape the dynamic integration of the neural information acquired in the new environment. This basic aspect was here studied by the electroencephalogram (EEG) dynamics where oscillatory modulations were measured during a visuo-attentional state preceding a visuo-motor docking task. Astronauts in microgravity conducted the experiment in free-floating aboard the International Space Station, before the space flight and afterwards. We observed stronger power decrease (~ERD: event related desynchronization) of the ~10 Hz oscillation from the occipital-parietal (alpha ERD) to the central areas (mu ERD). Inverse source modelling of the stronger alpha ERD revealed a shift from the posterior cingulate cortex (BA31, from the default mode network) on Earth to the precentral cortex (BA4, primary motor cortex) in weightlessness. We also observed significant contribution of the vestibular network (BA40, BA32, and BA39) and cerebellum (lobule V, VI). We suggest that due to the high demands for the continuous readjustment of an appropriate body posture in free-floating, this visuo-attentional state required more contribution from the motor cortex. The cerebellum and the vestibular network involvement in weightlessness might support the correction signals processing necessary for postural stabilization, and the increased demand to integrate incongruent vestibular information.

No MeSH data available.


Related in: MedlinePlus