Cortical Modulation of the Transient Visual Response at Thalamic Level: A TMS Study
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Cortical Modulation of the Transient Visual Response at Thalamic Level: A TMS StudyData
2011-02-10Cita bibliográfica
Espinosa N, Mariño J, Labra C de, Cudeiro J. Cortical Modulation of the Transient Visual Response at Thalamic Level: A TMS Study. PLoS ONE. 2011;6(2):e17041
Resumo
[Abstract] The transient visual response of feline dorsal lateral geniculate nucleus (dLGN) cells was studied under control conditions
and during the application of repetitive transcranial magnetic stimulation at 1 Hz (rTMS@1Hz) on the primary visual cortex
(V1). The results show that rTMS@1Hz modulates the firing mode of Y cells, inducing an increase in burst spikes and a
decrease in tonic firing. On the other hand, rTMS@1Hz modifies the spatiotemporal characteristics of receptive fields of X
cells, inducing a delay and a decrease of the peak response, and a change of the surround/center amplitude ratio of RF
profiles. These results indicate that V1 controls the activity of the visual thalamus in a different way in the X and Y pathways,
and that this feedback control is consistent with functional roles associated with each cell type.
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