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The human cerebellum is essential for modulating perceptual sensitivity based on temporal expectations
Assaf Breska1, Richard B Ivry1
1Department of Psychology and Helen Wills Neuroscience Institute, University of California, Berkeley, Berkeley, United States.
Elife
|June 24, 2021
Summary
Individuals with cerebellar degeneration (CD) do not benefit from temporal cues for perceptual timing. This suggests the cerebellum is crucial for proactively adjusting perceptual sensitivity in time.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Perception
Background:
- Attention enhances perceptual sensitivity in space and time.
- Cortico-thalamic networks are traditionally linked to attentional orienting.
- Cerebellar degeneration (CD) impairs reaction time benefits from temporal anticipation cues.
Purpose of the Study:
- To investigate the cerebellum's role in proactive attentional modulation of perceptual sensitivity in time.
- To determine if individuals with CD benefit from temporal cues in a non-speeded perceptual task.
Main Methods:
- Tested participants with cerebellar degeneration (CD) on a challenging perceptual discrimination task.
- Assessed benefit from temporal cues presented either aperiodically or rhythmically.
- Compared performance of CD group to control participants.
Main Results:
- CD group showed no duration-specific perceptual sensitivity benefit from aperiodic temporal cues.
- CD group performed similarly to controls when cued by a rhythmic stream.
- This dissociation highlights a specific role for the cerebellum in temporal attention.
Conclusions:
- The cerebellum contributes to the proactive attentional adjustment of perceptual sensitivity in time.
- Findings extend the known functions of the cerebellum beyond motor timing to include temporal attention.
- The cerebellum's role in temporal attention is dependent on cue regularity.
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