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Binocular summation in marmoset lateral geniculate nucleus
Elissa Belluccini1,2,3, Natalie Zeater1,2,3, Alexander N J Pietersen1,2,3
1ARC Centre of Excellence for Integrative Brain Function, University of Sydney, Sydney 2000, Australia.
Visual Neuroscience
|November 14, 2019
Summary
Binocular summation in the koniocellular (K) layers of the dorsal lateral geniculate nucleus (LGN) is weak. Most cells showed reduced responses to simultaneous binocular stimulation, indicating predominantly sublinear integration of visual inputs.
Area of Science:
- Neuroscience
- Visual Processing
- Sensory Systems
Background:
- The dorsal lateral geniculate nucleus (LGN) in primates and carnivores exhibits eye-alternating monocular input in its main laminae.
- Koniocellular (K) layers of the LGN are known to receive convergent binocular input, but summation mechanisms remain unclear.
Purpose of the Study:
- To investigate how visual inputs from both eyes summate in the K layers of the marmoset LGN.
- To characterize the nature of binocular summation in K layer cells.
Main Methods:
- Extracellular array electrode recordings were performed in the marmoset (Callithrix jacchus) LGN, specifically targeting K layers.
- Visual stimuli, including flashed pulses and drifting gratings, were presented to individual eyes or simultaneously to both eyes.
Main Results:
- Most K layer cells (61%) exhibited reduced peak firing rates when stimulated binocularly compared to dominant eye stimulation.
- A subset of cells showed response facilitation (17%) or partial summation (22%).
- Sublinear summation was also observed for contrast-varying stimuli and in parvocellular/magnocellular layers.
Conclusions:
- Binocular summation in the marmoset LGN K layers is predominantly weak and sublinear.
- These findings provide novel insights into the integration of visual information within the LGN.
