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The late Robert M. Yerkes of Harvard University found in 1904 that aquatic turtles have somewhat worse depth-discrimination than land turtles. On the visual cliff one might expect an aquatic turtle to respond to the reflections from the glass as it might to water and prefer the deep side for this reason.
Human physiology of underwater diving is the physiological influences of the underwater environment on the human diver, and adaptations to operating underwater, both during breath-hold dives and while breathing at ambient pressure from a suitable breathing gas supply.
Underwater diving is practiced as part of an occupation, or for recreation, where the practitioner submerges below the surface of the water or other liquid for a period which may range between seconds to the order of a day at a time, either exposed to the ambient pressure or isolated by a pressure resistant suit, to interact with the underwater ...
Cliff diving is the leaping off a cliff edge, usually into a body of water, as a form of sport. It may be done as part of the sport of coastal exploration [ 1 ] or as a standalone activity. Particular variations on cliff jumping may specify the angle of entry into the water or the inclusion or exclusion of human-made platforms or other equipment.
Open-water diving implies that if a problem arises, the diver can directly ascend vertically to the atmosphere to breathe air. [114] Wall diving is done along a near vertical face. Blue-water diving is done in good visibility in mid-water where the bottom is out of sight of the diver and there may be no fixed visual reference. [115]
In the early years of the sport, finding suitable places to jump was an issue, and people started jumping from any high place – in Europe and the United States they started jumping from bridges, then diving head first into the water. This evolved into "fancy diving" in Europe, and, particularly in Germany and Sweden, as a gymnastic act. The ...
A simple record of depth and time for a dive is useful as a legal record of a diving operation, where this is required, and in the case of an accident during the dive, an accurately recorded dive profile can provide useful diagnostic information for treatment of the injured diver and for analysis of the circumstances leading to the accident and ...
Depth perception is the ability to perceive distance to objects in the world using the visual system and visual perception. It is a major factor in perceiving the world in three dimensions Depth sensation is the corresponding term for non-human animals, since although it is known that they can sense the distance of an object, it is not known ...