Cerebellar perturbation impairs human working memory and degrades spatial tuning throughout cortex

Area of Science:

• Cognitive Neuroscience
• Neurobiology of Memory

Background:

• Working memory is crucial for cognition, traditionally linked to frontoparietal networks.
• Emerging evidence implicates the cerebellum in cognitive functions, including memory.
• The necessity of cerebellar processing for persistent information maintenance remains unclear.

Purpose of the Study:

• To investigate the causal role of the cerebellum in spatial working memory.
• To determine if cerebellar activity is essential for maintaining visual information or a consequence of cortical processing.

Main Methods:

• Utilized functional magnetic resonance imaging (fMRI) to observe brain activity.
• Employed transcranial magnetic stimulation (TMS) to perturb cerebellar function in humans.
• Assessed the impact of cerebellar perturbation on spatial working memory recall and cortical spatial tuning.

Main Results:

• Cerebellar perturbation significantly degraded cortical spatial tuning.
• Disruption of the cerebellum impaired spatial working memory recall.
• The observed impairment was comparable to that seen after perturbing frontoparietal working memory regions.

Conclusions:

• Established a causal role for the cerebellum in the persistent maintenance of spatial information.
• Demonstrated that cerebellar function is necessary, not merely reflective, for spatial working memory.
• These findings necessitate a re-evaluation of current models of human working memory.