Responses of primate LGN cells to moving stimuli involve a constant background modulation by feedback from area MT
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Responses of primate LGN cells to moving stimuli involve a constant background modulation by feedback from area MTAutor(es)
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2013-05-03Cita bibliográfica
Jones HE, Andolina IM, Grieve KL, Wang W, Salt TE, Cudeiro J, Sillito AM. Responses of primate LGN cells to moving stimuli involve a constant background modulation by feedback from area MT. Neurosci. 2013;246:254-264.
Resumo
[Abstract] The feedback connections from the cortical middle temporal (MT) motion area, to layer 6 of the primary visual cortex (V1), have the capacity to drive a cascaded feedback influence from the layer 6 cortico-geniculate cells back to the lateral geniculate nucleus (LGN) relay cells. This introduces the possibility of a re-entrant motion signal affecting the relay of the retinal input through the LGN to the visual cortex. The question is whether the response of LGN cells to moving stimuli involves a component derived from this feedback. By producing a reversible focal pharmacological block of the activity of an MT direction column we show the presence of such an influence from MT on the responses of magno, parvo and koniocellular cells in the macaque LGN. The pattern of effect in the LGN reflects the direction bias of the MT location inactivated. This suggests a moving stimulus is captured by iterative interactions in the circuit formed by visual cortical areas and visual thalamus.
Palabras chave
Lateral geniculate nucleus
Feedback influence
Area MT
Feedback influence
Area MT
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