Bereitschaftspotential preceding spontaneous and voluntary eyelid blinks in normal individuals

The eyelid blink is affected in numerous neurological diseases, occurring with increasing frequency, as observed in dementia, hyperkinetic movement disorders, and schizophrenia, or its reduction, as in Parkinson's patients (Stevens, 1978; Chen et al., 2003; Bologna et al., 2009; Chan et al., 2010). In addition to the protective and moisturizing function of the cornea, the eyelid blink actively participates in saccadic eye movements, fixations, visual cognitive processing and emotional expressions (Delgado-García et al., 2002, 2003).

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