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Time course of the effects of a tactile prepulse stimulus applied to the tibial nerve on R2 test reflex responses elicited by a blink reflex. The size of the conditioned R2 responses is expressed as a percentage of their unconditioned values. Blue diamond: patients with restless legs syndrome; purple square: healthy control. Y-axis: size of the conditioned reflex responses in percentage; X-axis: conditioning test interval in milliseconds.
