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Binocular summation in marmoset lateral geniculate nucleus

Published online by Cambridge University Press:  13 November 2019

Elissa Belluccini ,
Natalie Zeater ,
Alexander N.J. Pietersen ,
Calvin D. Eiber  and
Paul R. Martin Open the ORCID record for Paul R. Martin [Opens in a new window]
Elissa Belluccini
Affiliation:
ARC Centre of Excellence for Integrative Brain Function, University of Sydney, Sydney 2000, Australia Save Sight Institute, University of Sydney, Sydney 2000, Australia School of Medical Sciences, University of Sydney, Sydney 2000, Australia
Natalie Zeater
Affiliation:
ARC Centre of Excellence for Integrative Brain Function, University of Sydney, Sydney 2000, Australia Save Sight Institute, University of Sydney, Sydney 2000, Australia School of Medical Sciences, University of Sydney, Sydney 2000, Australia
Alexander N.J. Pietersen
Affiliation:
ARC Centre of Excellence for Integrative Brain Function, University of Sydney, Sydney 2000, Australia Save Sight Institute, University of Sydney, Sydney 2000, Australia School of Medical Sciences, University of Sydney, Sydney 2000, Australia
Calvin D. Eiber
Affiliation:
ARC Centre of Excellence for Integrative Brain Function, University of Sydney, Sydney 2000, Australia Save Sight Institute, University of Sydney, Sydney 2000, Australia School of Medical Sciences, University of Sydney, Sydney 2000, Australia
Paul R. Martin*
Affiliation:
ARC Centre of Excellence for Integrative Brain Function, University of Sydney, Sydney 2000, Australia Save Sight Institute, University of Sydney, Sydney 2000, Australia School of Medical Sciences, University of Sydney, Sydney 2000, Australia
*
*Address correspondence to: Paul R Martin, Email: [email protected]
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Abstract

In primates and carnivores, the main laminae of the dorsal lateral geniculate nucleus (LGN) receive monocular excitatory input in an eye-alternating fashion. There is also evidence that nondominant eye stimulation can reduce responses to dominant eye stimulation and that a subset of LGN cells in the koniocellular (K) layers receives convergent binocular excitatory input from both eyes. What is not known is how the two eye inputs summate in the K layers of LGN. Here, we aimed to answer this question by making extracellular array electrode recordings targeted to K layers in the marmoset (Callithrix jacchus) LGN, as visual stimuli (flashed 200 ms temporal square-wave pulses or drifting gratings) were presented to each eye independently or to both eyes simultaneously. We found that when the flashed stimulus was presented to both eyes, compared to the dominant eye, the peak firing rate of most cells (61%, 14/23) was reduced. The remainder showed response facilitation (17%) or partial summation (22%). A greater degree of facilitation was seen when the total number of spikes across the stimulus time window (200 ms) rather than peak firing rates was measured. A similar pattern of results was seen for contrast-varying gratings and for small numbers of parvocellular (n = 12) and magnocellular (n = 3) cells recorded. Our findings show that binocular summation in the marmoset LGN is weak and predominantly sublinear in nature.

Keywords

Binocular visionParallel visual pathwaysLateral geniculate nucleusNonhuman primates
Type
Research Article
Information
Visual Neuroscience , Volume 36 , 2019 , E012
Copyright
Copyright © Cambridge University Press 2019 

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