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Pontine reference frames for the sensory guidance of movement
Konstantin Tziridis1, Peter W Dicke, Peter Thier
1Department for Cognitive Neurology, Hertie Institute for Clinical Brain Research, University of Tübingen, Otfried-Müller-Strasse 27, Tübingen 72076, Germany.
Cerebral Cortex (New York, N.Y. : 1991)
|June 15, 2011
Summary
The pontine nuclei (PN) adapt sensory-motor transformations for the cerebellum. Their spatial reference frames for movement guidance closely resemble those found in the cortex.
Area of Science:
- Neuroscience
- Motor Control
- Sensory-Perception
Background:
- The pontine nuclei (PN) are crucial relay stations in the corticopontocerebellar pathway.
- Understanding their role in processing spatial reference frames is key to deciphering sensorimotor integration.
Purpose of the Study:
- To investigate whether the dorsal pontine nuclei (DPN) transform spatial reference frames for cerebellar processing.
- To compare reference frames in the DPN with those in cortical areas involved in movement guidance.
Main Methods:
- Recorded movement-related neuronal activity in the dorsal pontine nuclei (DPN) of monkeys.
- Monkeys performed fixed-vector saccades and hand reaches from various starting positions.
- Analyzed neuronal responses to classify spatial reference frames (oculocentric, hand-centered, or mixed).
Main Results:
- 83 task-related neurons were analyzed, showing saccade-related (SR) and hand movement-related (HMR) activity.
- Approximately 40% of SR neurons were oculocentric; others depended on eye starting position.
- A third of HMR neurons used hand-centered coordinates; others showed mixed position dependencies, similar to cortical neurons.
Conclusions:
- Pontine reference frames for sensory-guided movement are highly similar to cortical reference frames.
- The prevalence of orbital position gain fields in DPN neurons matches that of the lateral intraparietal area (LIP).
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