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The R1 component of the blink reflex was evoked by stimulation of the left supraorbital and infraorbital nerves in 10 subjects. In addition, an artificial dipole was placed over the left eyebrow, in order to simulate the occurrence of the R1 component of the blink reflex. These electrical events were recorded at scalp locations Fz, F8, F7, C6, C5, referred either to Cv7 (seventh cervical vertebra) or to Fz. It was found that the blink R1 and the field of the artificial dipole had similar behaviour across the scalp; larger amplitudes were recorded ipsilateral to the stimulus from derivations referred to Cv7, but when referred to Fz larger contralateral amplitudes were measured. In the latter condition, the scalp-recorded R1 shows similar amplitude behaviour to electrical events originating from the cortex and hence its appearance may be deceiving.
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