ground


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Related to ground: ground control, ground zero

ground

 [grownd]
1. a path of conduction from an electrical circuit to the earth.
2. to connect an electrical circuit or electrical equipment to the earth.
3. zero electrical potential.

ground

Etymology: AS, grund
1 (in electricity) a connection between the electric circuit and the ground, which becomes a part of the circuit.
2 (in psychology) the background of a visual field that can enhance or inhibit the ability of a patient to focus on an object.

ground

1. Basic substance or foundation.
2. Reduced to a powder; pulverized.
3. In electronics, the negative or earth pole that has zero electrical potential.

figure

A part or pattern in the visual field which has the perceptual attribute of completeness and is perceived as distinct from the rest of the field which forms the ground. Example: a printed word against a background page.
ambiguous figure An image or drawing arranged in such a way that its perception oscillates or flips involuntarily between, usually, two interpretations even though the retinal image remains constant, thus indicating that higher cortical processing are involved. Syn. reversible figure. See Blivet figure; Kanizsa figure; illusion; Necker cube; Rubin's vase; Schroeder's staircase.
Blivet figure An 'impossible' figure in which three apparently solid tubes are attached at one end of a rectangular base which projects only two bars (Fig. F4). See Necker cube; Schroeder's staircase; Rubin's vase.
fortification figure See scintillating scotoma.
Kanizsa figure An ambiguous figure in which the illusory contour of a square (or triangle) appears in the middle of four (or three) truncated solid squares (or circles). It is an illustration of the perceptual ability to make sense of an incomplete figure by creating a 'whole' image from the separate elements (Gestalt organization). Some people cannot perceive the contour. Syn. Kanizsa square (Fig. F5).reversible f. See ambiguous figure.
Fig. F4 Blivet figureenlarge picture
Fig. F4 Blivet figure
Fig. F5 Kanisza figureenlarge picture
Fig. F5 Kanisza figure
References in classic literature ?
She stamped three times on the ground, and the earth trembled, and both the church and the monk began to shake.
But when he went to look at the body of the bird he found instead of the dove a round white egg lying on the ground.
The estate had formerly belonged to a gentleman of opulence and taste, who had bestowed some considerable attention to the adornment of his grounds.
Gahan of Gathol let the ship rise a few feet from the ground, then, seizing a bow rope, he dropped over the side.
Springing lightly from the ground he swarmed up the rope toward the bow of the flier.
Still, Amphimedon just took a piece of the top skin from off Telemachus's wrist, and Ctesippus managed to graze Eumaeus's shoulder above his shield; but the spear went on and fell to the ground.
He saw the plane tilt and the machine rise from the ground.
It was thought best to divide their forces and try different trapping grounds.
said Joe, scrambling down to the ground by the anchor-rope.
He fell heavily to the ground, and the spear stuck in his heart, which still beat, and made the butt-end of the spear quiver till dread Mars put an end to his life.
The wires go out from the cave and fence in a circle of level ground a hundred yards in diameter; they make twelve independent fences, ten feet apart -- that is to say, twelve circles within circles -- and their ends come into the cave again.
Tom listened with the profoundest respect to this chapter of accidents, and followed East across the level ground till they came to a sort of gigantic gallows of two poles, eighteen feet high, fixed upright in the ground some fourteen feet apart, with a cross-bar running from one to the other at the height of ten feet or thereabouts.