Using motion sickness to describe the unfortunately common wooziness that can come with playing VR is a bit of a misnomer, since it’s only caused by the perception of movement. More accurately, VR sickness can occur when the refresh rate on your display is too low, or when the movement you’re seeing through your headset doesn’t correspond to the movement that your inner ear is detecting. To take an extreme example: if you’re riding a roller coaster in VR, but are sitting still in real life, your inner ear will notice the discrepancy and may prompt some motion sickness.