The fear of heights is one of the most common apprehensions when planning a parachute jump. This is an unfounded fear, because the skydiver, whether beginner or experienced, does not feel this sensation. Even if this discomfort of heights is familiar to you and if the edge of cliffs puts you off, you will not feel dizzy during your parachute jump. How can we explain this curious phenomenon? Sensory cues modified during a parachute jump It is important to dissociate vertigo and fear of falling. Vertigo is a warning signal which manifests itself by a modification of perceptions, with the distressing impression that the ground is moving. But, whatever the height, we only feel this unpleasant sensation if our feet are placed on the ground and if we maintain visual contact with it. As the sensory cues are modified by the altitude (3,000 to 4,000 m), the dizziness of a parachute jump does not exist. By losing our usual vertical references, the perception of height disappears. It's the same thing on a plane: have you ever felt dizzy looking out the window?