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 periodicals archive ?
Nevertheless, more Americans perceive that education and taxes have lost ground than say they have gained ground in the past eight years.
But Zestril gradually made up the lost ground and, forging to the front approaching the final furlong, she ran on strongly to defeat Mrs P by one and a quarter lengths.
Suppliers now want to reclaim that lost ground and even recoup some recent price increases in chlorine feedstock.
Indeed, in certain respects the process has lost ground.
However, after scientists completed a series of studies using seismic waves to probe the Tibetan crust, this idea lost ground to another theory, which holds that the ramming plates have squeezed together a warm and weak Tibetan crust, thickening it and pushing up the plateau.
Price will be, more than ever, a key factor in purchasers' decision-making; it is notable that in the past couple of years, US importers have lost ground to cheaper suppliers in countries such as Brazil.
Most of the 33 sectors on the TSE lost ground, with the decliners led by the miscellaneous sector that includes game giant Nintendo, followed by the consumer finance and sea transport sectors.
Kader Nomads B, who are in contention for honours, lost ground when they defeated Ormesby E by just six sets to four.
LEWIS HAMILTON has slammed claims that his inexperience will cost him the world title, but admitted McLaren are mystified why they have lost ground to Kimi Raikkonen's Ferrari.
Ryhope lost ground because of their 1-1 result at Annfield Plain.
The city had moved forward under Richard Riordan's leadership but lost ground under Hahn, who rarely took responsibility for the things that went wrong and too often put a higher premium on political advantage than solving problems.
an overconcentration in tech stocks in the late 1990's) are often prone to make another "bet it all" impulse investment in a vain attempt to make up their lost ground in one fell swoop.