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Temporal Ordering of Dynamic Expression Data from Detailed Spatial Expression Maps
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Spatial-Temporal Dynamics of the Sensorimotor Cortex: Sustained and Transient Activity.

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    |May 13, 2018
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    Summary
    This summary is machine-generated.

    Sensorimotor cortex activity can be sustained or transient, reflecting speech action duration. This neurophysiological finding clarifies how the brain controls movement timing.

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    Area of Science:

    • Neuroscience
    • Motor Control
    • Speech Production

    Background:

    • The precise organization of the sensorimotor cortex for controlling movement features remains incompletely understood.
    • A key question is the relationship between an action's duration and the duration of neural activity in the sensorimotor cortex.

    Purpose of the Study:

    • To investigate the relationship between speech action duration and high-frequency band (HFB) power changes in the sensorimotor cortex.
    • To determine if HFB power changes are transient or sustained relative to speech duration.

    Main Methods:

    • Utilized subdural electrocorticography electrodes in five human subjects.
    • Analyzed HFB power changes (75-135 Hz) during the pronunciation of the Dutch /i/ vowel with varying durations.

    Main Results:

    • Demonstrated that sensorimotor cortex neuronal activity patterns can directly correlate with action duration in specific locations.
    • Observed transient neuronal activity, peaking at movement onset and/or offset, in other sensorimotor cortex locations during the same speech actions.

    Conclusions:

    • Neuronal activity in the sensorimotor cortex exhibits both sustained and transient responses related to speech action duration.
    • These findings offer insights into the neural mechanisms underlying motor control and action timing.