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Commissural communication allows mouse intergeniculate leaflet and ventral lateral geniculate neurons to encode
A Pienaar1, L Walmsley1, E Hayter1
1Faculty of Biology, Medicine and Health, School of Medicine, University of Manchester, Manchester, UK.
The Journal of Physiology
|September 22, 2018
Summary
The intergeniculate leaflet and ventral lateral geniculate nucleus (IGL/vLGN) use light signals from the opposite eye to create unique visual responses. This commissural signaling is crucial for encoding differences in light between the eyes, impacting vision control.
Area of Science:
- Neuroscience
- Visual System
- Thalamic Circuits
Background:
- The intergeniculate leaflet and ventral lateral geniculate nucleus (IGL/vLGN) are key visual thalamic regions involved in circadian and visuomotor/vestibular control.
- A unique feature of IGL/vLGN is extensive reciprocal commissural connections with unknown functions.
Purpose of the Study:
- To investigate the functional role of commissural connections within the IGL/vLGN.
- To understand how these connections contribute to visual processing and sensory properties.
Main Methods:
- Multielectrode recording in mice.
- Electrical microstimulation and thalamic inactivation.
- Presentation of various visual stimuli.
Main Results:
- Commissural projecting IGL/vLGN cells primarily respond to contralateral light increments.
- Cells receiving commissural input show antagonistic binocular responses, encoding interocular irradiance differences.
- These antagonistic responses depend on contralateral thalamic input, disappearing upon inactivation.
Conclusions:
- Commissural signaling in the IGL/vLGN is fundamental for generating unique visual response properties.
- This signaling plays a pivotal role in encoding interocular differences in light.
- The findings highlight the importance of IGL/vLGN commissural pathways for visual control systems.
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