Phase-Dependent Cerebellar Contributions to Visual Working Memory: An Online Triple-Pulse Transcranial Magnetic...

Area of Science:

• Neuroscience
• Cognitive Psychology

Background:

• The cerebellum, traditionally viewed as a motor structure, is increasingly recognized as a domain-general modulatory hub.
• Evidence links the cerebellum to nonmotor functions, including working memory (WM), a key executive function.
• Cerebellar engagement in WM may vary dynamically across different phases of memory processing.

Purpose of the Study:

• To investigate the phase-specific involvement of the cerebellum in visuospatial working memory (VWM).
• To examine how cerebellar neuromodulation differentially affects maintenance and retrieval processes in VWM tasks.
• To utilize temporally precise, online transcranial magnetic stimulation (TMS) to probe cerebellar function during VWM.

Main Methods:

• A within-subjects design with 38 healthy participants performing a forward Corsi block-tapping task (CBTT).
• Online transcranial magnetic stimulation (TMS) was applied to either the cerebellum or the vertex (control site).
• TMS was delivered during distinct phases of VWM: maintenance and retrieval, under four experimental conditions.

Main Results:

• Cerebellar stimulation during the retrieval phase impaired performance, indicated by slower response times and reduced accuracy.
• Conversely, cerebellar stimulation during the maintenance phase enhanced memory span.
• These findings suggest a dual role for the cerebellum in VWM depending on the cognitive phase.

Conclusions:

• The cerebellum contributes to VWM in a phase-specific manner.
• Cerebellar neuromodulation facilitates memory maintenance but disrupts memory retrieval.
• This highlights distinct functional roles of the cerebellum across different stages of working memory.