ground

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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 ?
Yard by yard the School- house have been driven back, contesting every inch of ground.
Crab strikes his heel into the ground, to mark the spot where the ball was caught, beyond which the school line may not advance; but there they stand, five deep, ready to rush the moment the ball touches the ground.
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.
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.
How comes it that you are so lamentably less valiant now that you are on your own ground, face to face with the suitors in your own house?
At Usanga's order one of the blacks lifted her from the ground and carried her to the machine, and after Usanga had clambered aboard, they lifted her up and he reached down and drew her into the fuselage where he removed the thongs from her wrists and strapped her into her seat and then took his own directly ahead of her.
said Joe, scrambling down to the ground by the anchor-rope.
The fences are fastened to heavy oaken posts only three feet apart, and these posts are sunk five feet in the ground.
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.
We scarcely seemed to gain ground upon them at all.