Article

This investigation used magnetoencephalography (MEG) to examine the neural
oscillatory responses of the sensorimotor cortices during the motor planning and
movement execution stages of children with typical development and children with
cerebral palsy (CP). METHOD: The study involved 13 children with CP (nine males,
four females; mean [SD] age 14y 3mo [9mo], range 10-18y; height 1.61m [0.08m];
weight 52.65kg [13kg]), and 13 age- and sex-matched typically developing children
(height 1.64m [0.06m]; weight 56.88kg [10kg]). The experiment required the
children to extend their knee joint as whole-head MEG recordings were acquired.
Beamformer imaging methods were employed to quantify the source activity of the
beta-frequency (14-28Hz) event-related desynchronization (ERD) that occurs during
the motor planning period, and the gamma-frequency (~50Hz) event-related
synchronization (ERS) that occurs at the motor execution stage. RESULTS: The
children with CP had a stronger mean beta ERD during the motor planning phase and
reduced mean gamma ERS at the onset of movement. INTERPRETATION: The
uncharacteristic beta ERD in the children with CP suggests that they may have
greater difficulty planning knee joint movements. We suggest that these aberrant
beta ERD oscillations may have a cascading effect on the gamma ERS, which
ultimately affects the execution of the motor command.
CI - (c) 2014 Mac Keith Press.

Langue : ANGLAIS