Cerebellar Theta Burst Stimulation Impairs Working Memory.

Area of Science:

• Neuroscience
• Cognitive Neuroscience
• Neuroimaging

Background:

• Working memory involves temporary information storage and manipulation.
• The cerebellum's role in working memory is linked to its prefrontal cortex connections.
• Theta burst stimulation (TBS) modulates cerebellar-prefrontal functional connectivity.

Purpose of the Study:

• To investigate the causal role of the cerebellum in working memory.
• To determine if excitatory intermittent TBS (iTBS) enhances and inhibitory continuous TBS (cTBS) disrupts working memory.
• To examine the effects of cerebellar TBS on specific working memory tasks.

Main Methods:

• Sixteen healthy participants received iTBS, cTBS, and sham TBS in separate sessions.
• Bilateral cerebellar stimulation was applied using a figure-of-eight coil.
• Participants completed letter 1-Back, 2-Back, digit span forward, and digit span backward tasks post-stimulation.

Main Results:

• A significant effect of stimulation type was found on digit span backward task performance (p=0.02).
• cTBS significantly reduced digit span backward scores compared to sham stimulation (p=0.01).
• Neither iTBS nor cTBS affected performance on 1-Back, 2-Back, or digit span forward tasks.

Conclusions:

• The cerebellum contributes to working memory processes.
• Inhibitory cerebellar stimulation (cTBS) can disrupt working memory, particularly complex sequential recall.
• Further research is needed to elucidate the precise mechanisms of cerebellar involvement in working memory.