Figure-ground modulation in awake primate thalamus
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Figure-ground modulation in awake primate thalamusAutor(es)
Fecha
2015Cita bibliográfica
Jones HE, Andolina IM, Shipp SD, Adams DL, Cudeiro J, Salt TE, Sillito AM. Figure-ground modulation in awake primate thalamus. Proc Natl Acad Sci U S A. 2015 Jun 2;112(22):7085-90.
Resumen
[Abstract] Figure-ground discrimination refers to the perception of an object, the figure, against a nondescript background. Neural mechanisms of figure-ground detection have been associated with feedback interactions between higher centers and primary visual cortex and have been held to index the effect of global analysis on local feature encoding. Here, in recordings from visual thalamus of alert primates, we demonstrate a robust enhancement of neuronal firing when the figure, as opposed to the ground, component of a motion-defined figure-ground stimulus is located over the receptive field. In this paradigm, visual stimulation of the receptive field and its near environs is identical across both conditions, suggesting the response enhancement reflects higher integrative mechanisms. It thus appears that cortical activity generating the higher-order percept of the figure is simultaneously reentered into the lowest level that is anatomically possible (the thalamus), so that the signature of the evolving representation of the figure is imprinted on the input driving it in an iterative process.
Palabras clave
Vision
Perception
Feedback
Lateral geniculate nucleus
Figure-ground discrimination
Perception
Feedback
Lateral geniculate nucleus
Figure-ground discrimination
Versión del editor
ISSN
0027-8424