Differences in Brain Oscillation Patterns During Motor-Related Sensory Imagery Creation and Recall.

Area of Science:

• Neuroscience
• Cognitive Neuroscience
• Brain-Computer Interfaces

Background:

• Motor imagery (MI) involves cognitive functions like memory and attention.
• Two types of MI exist: isomorphic (IMI) for exact reproduction and transmorphic (TMI) for new mental representations.
• Distinguishing IMI and TMI using electroencephalography (EEG) is crucial for understanding cognitive processes.

Purpose of the Study:

• To identify distinct EEG oscillation patterns differentiating IMI and TMI.
• To investigate the roles of frontal midline theta (FMΘ), central parietal beta (CPβ), and sensorimotor rhythms (SMR) in these MI types.
• To explore the neural correlates of reproducing versus transforming motor experiences.

Main Methods:

• Twenty healthy young adults participated.
• Participants used a haptic interface to perform hand-clamping actions and memorize sensations.
• EEG data were recorded during subsequent IMI (reproducing sensations) and TMI (imagining altered sensations) tasks.

Main Results:

• Significant differences in FMΘ and CPβ oscillations were found between IMI and TMI.
• IMI showed brain rhythm activity akin to working memory, supporting its reproductive function.
• TMI exhibited oscillation patterns resembling introspective activity and multimodal sensory transformations.
• Parietal delta and theta differences aligned with findings from actual movement studies.

Conclusions:

• EEG can differentiate between isomorphic and transmorphic motor imagery.
• IMI relies on brain mechanisms similar to working memory for accurate recall.
• TMI engages neural processes associated with sensory transformation and introspection.
• Controlling movement kinematics is vital for MI replicating sensory experiences, while creating new representations may be less constrained.