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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 ?
At 98 Smith Street in Brooklyn, a two-story property offering 600 s/f of ground floor retail space, Eleven Jewelry has signed a lease.
Ground floor lobby and reception: monolithic reception desk with writing tablets of stacked glass.
The other two Ground Floor chambers are most closely associated with Franklin Roosevelt.
The ground floor is connected to a contiguous lower level of about 5,500 s/f, a space which has served as a private event venue for the art, music, and fashion industries and has a unique, private entrance off of Extra Place--the alleyway behind the space--as well as from within the ground floor space.
A four-story building with 9,800 square feet of ground floor retail/restaurant space and 59 loft-style apartments, designed by Kanner Architects, will be located across the street from City Hall West at the southwest corner of Anaheim Blvd.
The duo is handling space at 341-345 Amsterdam Avenue at 76th Street, where they have from 1,200 to 3,000 s/f of ground floor space.
There are three other main ground floor points of entry: MPs have a special entrance in the south-east corner of the plan; the public comes in at the north-east corner; scholars enter next to the south-west corner.
One Aragon will consist of 184 luxury rental apartments on ten floors in addition to ground floor retail and restaurants and four levels of parking.
It currently has 3,000 s/f on the ground floor with a 4,500 s/f selling lower level on Broadway between 11th and 12th Streets.
Cala added that in the Third Quarter of 1999, Cala Corporation owned and operated two Ground Floor Cafes in Oklahoma City, whereas in the Third Quarter of 2000 the company owned and operated only one Ground Floor Cafe.
Calumet has rented 16,000 s/f on a long term lease on three levels, including the ground floor, lower level and the entire 2nd floor at 22 West 22 Street.