Suppression of V1 feedback produces a shift in the topographic representation of receptive fields of LGN cells by unmasking latent retinal drives

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- Investigación (FCS) [1282]
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Suppression of V1 feedback produces a shift in the topographic representation of receptive fields of LGN cells by unmasking latent retinal drivesDate
2017-03-18Citation
Aguila J, Cudeiro FJ, Rivadulla C. Suppression of V1 feedback produces a shift in the topographic representation of receptive fields of LGN cells by unmasking latent retinal drives. Cereb Cortex. 2017;27(6):3331-3345
Abstract
[Abstract] In awake monkeys, we used repetitive transcranial magnetic stimulation (rTMS) to focally inactivate visual cortex while measuring the responsiveness of parvocellular lateral geniculate nucleus (LGN) neurons. Effects were noted in 64/75 neurons, and could be divided into 2 main groups: (1) for 39 neurons, visual responsiveness decreased and visual latency increased without apparent shift in receptive field (RF) position and (2) a second group (n = 25, 33% of the recorded cells) whose excitability was not compromised, but whose RF position shifted an average of 4.5°. This change is related to the retinotopic correspondence observed between the recorded thalamic area and the affected cortical zone. The effect of inactivation for this group of neurons was compatible with silencing the original retinal drive and unmasking a second latent retinal drive onto the studied neuron. These results indicate novel and remarkable dynamics in thalamocortical circuitry that force us to reassess constraints on retinogeniculate transmission.
Keywords
Corticothalamic feedback
LGN
RFs
v1
Visual system
Neuroplasticity
LGN
RFs
v1
Visual system
Neuroplasticity
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This is a pre-copyedited, author-produced version of an article accepted for publication in "Cerebral Cortex" following peer review. The version of record is avaliable online at Oxford University Press website.
ISSN
1047-3211
1460-2199
1460-2199