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Published on: October 16, 2019
Encoding of sensory prediction errors in the human cerebellum
John Schlerf1, Richard B Ivry, Jörn Diedrichsen
1Department of Physical Medicine and Rehabilitation, Johns Hopkins School of Medicine, Baltimore, Maryland 21205, USA. schlerf@gmail.com
Summary
The cerebellum learns from sensory prediction errors, processing both unexpected sensory events and omissions. This neuroimaging study reveals cerebellar activation for both error types, advancing motor neuroscience understanding.
Area of Science:
- Motor Neuroscience
- Cognitive Neuroscience
- Neuroimaging
Background:
- The cerebellum is thought to learn from sensory prediction errors.
- Neuroimaging studies have not definitively shown cerebellar error processing.
- Existing research suggests the cerebellum may process unexpected sensory events but not omissions.
Purpose of the Study:
- To compare cerebellar responses to errors from unexpected sensory presence versus absence.
- To investigate the role of the cerebellum in encoding different types of sensory prediction errors.
Main Methods:
- Functional magnetic resonance imaging (fMRI) study with human participants.
- Participants performed reaching movements with potential sensory errors (force pulse presence or absence).
- Cerebellar blood-oxygen-level-dependent (BOLD) response analyzed, with heart rate variation accounted for.
Main Results:
- Initial analysis showed decreased cerebellar BOLD response on error trials.
- Heart rate decrease was observed during error trials.
- After heart rate correction, increased cerebellar activation in lobules V and VI was found for both error types.
Conclusions:
- The human cerebellum encodes errors signaled by both the unexpected presence and absence of sensory stimulation.
- This study provides evidence for a more comprehensive role of the cerebellum in processing sensory prediction errors than previously thought.
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