Maps of red and green cone inputs to visual receptive fields of the marmoset LGN obtained with the reverse correlation technique
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1
Institute of Physiology, Medical School, University of Pecs, Hungary
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2
Department of Optometry & Vision Sciences, The University of Melbourne, Australia
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3
Bosch Institute and School of Medical Sciences, The University of Sydney, Australia
Red and green cones are the only source of visual input to the receptive fields (RFs) of parvocellular and magnocellular neurones in the primate lateral geniculate nucleus under photopic conditions. We have shown previously using sinusoidally modulated stimuli that the excitatory (centre) and inhibitory (surround) mechanisms can both receive mixed input from red and green cones in the new world monkey marmoset. The sensitivity of each neurone to chromatic contrast is determined by the segregation of cone types between these mechanisms. Conflicting results have been published by others on the basis of RF maps obtained from macaques using the reverse correlation technique. Here, we used the same technique in anaesthetised, paralysed trichromatic marmosets to test if mixed cone input to parvocellular and magnocellular RFs can be detected. RF maps of a preliminary sample of cells were established using M and L cone isolating, chromatic (L-M) and luminance (L+M) modulated binary noise sequences. Centre and surround regions of the RF maps were identified as pixels giving opposite sign of response to contrast increment. The results confirmed our earlier findings as far as various mixtures of L and M cones were found to drive the centre and surround. The sensitivity of cells to chromatic modulation (measured separately using low spatial frequency sinusoidal stimuli) was higher when centre and surround were dominated by different cone types. Interestingly, magnocellular RFs were sometimes dominated by a single cone type suggesting that the marmoset retina can contain extended patches of a single cone type.
Conference:
12th Meeting of the Hungarian Neuroscience Society, Budapest, Hungary, 22 Jan - 24 Jan, 2009.
Presentation Type:
Poster Presentation
Topic:
Developmental neurobiology and subcortical functions
Citation:
Buzás
P,
Tailby
C,
Cheong
K,
Camp
A and
Martin
PR
(2009). Maps of red and green cone inputs to visual receptive fields of the marmoset LGN obtained with the reverse correlation technique.
Front. Syst. Neurosci.
Conference Abstract:
12th Meeting of the Hungarian Neuroscience Society.
doi: 10.3389/conf.neuro.01.2009.04.127
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Received:
04 Mar 2009;
Published Online:
04 Mar 2009.
*
Correspondence:
Péter Buzás, Institute of Physiology, Medical School, University of Pecs, Pecs, Hungary, peter.buzas@aok.pte.hu