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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 ?
Department of Agriculture (USDA) Cooperative State Education, Research and Extension Service, in cooperation with the National Easter Seal Society and Purdue University's Breaking New Ground Resource Center, provides expertise and service to farmers, ranchers, and agricultural workers who have been injured and who might not return to work because of the lack of knowledge about the interaction between rural and disability needs.
Jose Bandujo, president of Bandujo, Donker & Brothers Advertising notes, "RPCI is breaking new ground everyday and the new branding campaign is going to make people stand up and take notice.
Calhoun County Council Chairman David Summers said, "On behalf of Calhoun County Council and our citizens, we are honored that Eastman Chemical Company is breaking new ground today.
CenterBoard is a privately held company whose network-based Virtual Operational Data Store (Virtual ODS) is breaking new ground in combining network and database technologies fundamentally changing the way enterprises integrate data.