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In attention, rate and gamma modulations are not concomitant effects. Rate modulation (solid curve) and gamma modulation (dashed curve) as a function of the excitatory synaptic conductance ratio gAMPA/gNMDA. Increasing this ratio increases rhythmic gamma-band power (dotted curve), decreases the rate modulation monotonically while gamma modulation has a peak. Either of the two modulations can be dominant, depending on the gamma power. Figure modified from (Deco et al., 2011).
