Introduction
nausea, dizziness, vestibular areflexic, nausea, oscillopsia, debilitating symptoms, kinetosis) syndrome
MOTION SICKNESS, CORTEX
Although virtual reality (VR) is, and in the near future will become even more, pervasive in our lives, most users experience a constellation of debilitating symptoms (nausea, dizziness, discomfort) known as cybersickness (CS). It is estimated that up to 95% of people wearing head-mounted VR displays experience some degree of these symptoms, which can be severe enough as to lead to abandonment of VR immersion in up to 15% of cases [Similar to motion sickness (or kinetosis) syndrome [The mismatch has its clear neurophysiological signatures in a widespread and progressive increase in low-frequency delta (1–2 Hz) electroencephalographic (EEG) oscillations [those that better activate the vestibular cortex during peripheral galvanic stimulation [Interventions using biophysically modelled tACS to reach the vestibular cortex in a rare vestibular areflexic patient with chronic symptoms of nausea, oscillopsia and postural instability, led to the observation that a higher stimulation frequency (i.e. 10 Hz) drastically reduced these symptoms [