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. Author manuscript; available in PMC: 2011 Sep 1.
Published in final edited form as: Neuroimage. 2010 Feb 10;52(3):897–912. doi: 10.1016/j.neuroimage.2010.02.004

Figure 6. The effect of the strength of the 10Hz FF and FB input on symmetry indices and TFR mu-alpha to mu-beta ratios.

Figure 6

For a fixed 5 ms delay between the rhythmic FF and FB input we manipulated the strength of the inputs via changes in the (A) post-synaptic conductance, (B) number of spike in the input burst on each cycle of the input, and (C) variance of spikes in the input burst on each cycle of the input (see Supplementary Figure 3). A. Increasing the post-synaptic conductances of the rhythmic FB input (left), while holding FF post-synaptic conductances constant, resulted in a decrease in the symmetry indices (top) and a decrease in the TFR mu-alpha to mu-beta ratio (bottom). The opposite pattern was found when the post-synaptic conductances of the FF input was increased, while holding FB conductances constant (right). B. Increasing the number of inputs on each cycle of the rhythmic FB input (left), while holding FF number constant, led to a decrease in symmetry indices and a decrease in the TFR ratio; the opposite pattern was found when the number of FF inputs were increased (right), while holding FB number constant. C. Increasing the variance of the inputs on each cycle the rhythmic FB input (left), while holding the FF variance constant, had a minimal effect on the symmetry indices, but resulted in a relative decrease in the TFR ratios. Increasing the variance of the rhythmic FF input (right), while holding the FB variance constant, again resulted in a relatively constant symmetry index, but led to an increase the TFR ratio.