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Updated: Apr 26, 2026
Modulating Cognition Using Transcranial Direct Current Stimulation of the Cerebellum
Published on: February 15, 2015
Mossy fibers in the cerebellar hemisphere show delay activity in a delayed response task
Takahiro Ishikawa1, Saeka Tomatsu2, Yoshiaki Tsunoda3
1Motor Disorders Project, Tokyo Metropolitan Institute of Medical Science, Tokyo 156-8506, Japan.
Abstract:
To examine whether mossy fibers (MFs) in the cerebellar hemisphere show delay activity, we recorded MF activity during a wrist movement task with a random instructed delay period in two monkeys. Among 155 task-related MFs, 70 MFs (45%) demonstrated significant delay activity. Those MFs were widely distributed in the cerebellar hemisphere. Some of the activities were evoked by instruction cue presentation, whereas other activity started in anticipation of the upcoming go signal. For most MFs, the delay activities showed directional tuning. These patterns of the activity were in common with those of neurons in the cerebral motor cortices.
Insights
Mossy fibers (MFs) in the cerebellar hemisphere exhibit significant delay activity during motor tasks. This activity, showing directional tuning, is similar to patterns observed in cerebral motor cortices.
Area of Science:
- Neuroscience
- Cerebellar Function
- Motor Control
Background:
- The cerebellum plays a crucial role in motor control and learning.
- Mossy fibers (MFs) are the primary input to the cerebellar cortex.
- The presence and nature of delay activity in MFs remain incompletely understood.
Purpose of the Study:
- To investigate whether mossy fibers (MFs) in the cerebellar hemisphere display delay activity.
- To characterize the properties of MF delay activity during a motor task with a delay period.
Main Methods:
- Recordings of MF activity were conducted in two monkeys during a wrist movement task.
- The task included a randomly instructed delay period between cue presentation and movement execution.
- Analysis focused on identifying and characterizing task-related MFs exhibiting delay activity.
Main Results:
- Out of 155 task-related MFs, 70 (45%) showed significant delay activity.
- This delay activity was widely distributed across the cerebellar hemisphere.
- Activity patterns included responses to instruction cues and anticipatory activity before the go signal, with most MFs exhibiting directional tuning.
Conclusions:
- Mossy fibers in the cerebellar hemisphere demonstrate significant delay activity, contributing to motor task processing.
- The characteristics of this delay activity, including directional tuning, parallel those found in cerebral motor cortex neurons.
- These findings suggest a more complex role for MFs in motor preparation and execution than previously appreciated.
