Evoked brain responses are generated by feedback loops.

@article{Garrido2007EvokedBR,
  title={Evoked brain responses are generated by feedback loops.},
  author={Marta I. Garrido and James Kilner and Stefan J. Kiebel and Karl J. Friston},
  journal={Proceedings of the National Academy of Sciences of the United States of America},
  year={2007},
  volume={104 52},
  pages={20961-6}
}
Neuronal responses to stimuli, measured electrophysiologically, unfold over several hundred milliseconds. Typically, they show characteristic waveforms with early and late components. It is thought that early or exogenous components reflect a perturbation of neuronal dynamics by sensory input bottom-up processing. Conversely, later, endogenous components have been ascribed to recurrent dynamics among hierarchically disposed cortical processing levels, top-down effects. Here, we show that evoked… CONTINUE READING
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