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Example cortical activation curve. Responses from a recording site evoked by thalamic electrical stimulation are shown. The activation curve was fitted with a sigmoidal function, and multiple parameters were obtained: RLow, lower asymptotic response level; RHigh, upper asymptotic response level; R25% and R75%, response levels 25% and 75% above RLow; C25% and C75%, currents corresponding to the response levels 25% and 75% above RLow; and DR, dynamic range (in dB) between C25% and C75%.
