Mental rehearsal modulates sensorimotor rhythms, especially mu and beta activity over motor-related cortical regions. During imagery, these rhythms commonly show event-related desynchronization, meaning a reduction in synchronized activity. After the imagery period, event-related synchronization can occur during recovery. Together, these changes provide measurable markers of internally generated motor processing.
Event-related desynchronization marks the imagery phase, whereas event-related synchronization characterizes the subsequent recovery period. Examining both phases gives researchers a time-linked view of how sensorimotor activity changes around imagined movement. These patterns help connect EEG observations with motor planning and provide signals that can be analyzed for brain-computer interface control.
Analysis focuses on activity over motor-related cortical regions because imagined movement engages neural processes associated with motor planning. Changes in sensorimotor rhythms in these areas can reveal how the brain organizes an action without producing physical movement. This makes the method useful for studying brain function and changes associated with neural plasticity.
A typical workflow records EEG while a person mentally rehearses a specified movement without carrying it out physically. Researchers then examine changes in mu and beta activity, including desynchronization during imagery and synchronization during recovery. The resulting patterns can be interpreted as markers of motor-related brain activity or prepared for translation into control signals.
A brain-computer interface can use the patterned changes in sensorimotor rhythms as control signals. Imagery-related EEG activity is analyzed so that distinct neural responses can be associated with commands for an external system. This approach supports assistive devices and communication systems by offering a noninvasive route for translating imagined movement into device control.
In neuroscience, the method helps researchers examine motor planning, brain function, and neural plasticity. In applied settings, it contributes to rehabilitation technologies and systems intended to restore or augment motor function. Its noninvasive recording approach is particularly relevant when researchers need to connect imagined actions with assistive-device control or communication.