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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 ?
Another percentage of patients still grind, but the nightguard's plastic is damaged - it wears and the teeth don't.
Fans looking forward to the upcoming comedy Grind now have the exclusive opportunity to watch the first eight minutes of the movie on AOL days before its nationwide release on August 15.
Mikro Pulverizer models grind, blend and disperse in a single dustless operation.
A dynamic playfield enables gamers to launch off ramps, traverse moving platforms and grind rails that change shape to expose hidden areas.
The machine's six numerically controlled casting positioning axes can be programmed to automatically grind parting line or core print fins, gate and riser stubs.
Mikro-Bantam pulverizer is said to be an economical mill for lab, pilot plant or small batch production, which grinds samples as small as 10 g for analytical purposes with minimal loss at rates of 200 lb/hr for small batches.
A dynamic playfield enables gamers to contend with ramps, moving platforms and grind rails that change shape or rotate to expose hidden areas.
Units have various styles of grinding plates, adjustable gap clearance between the grinding surfaces, and predetermined runnerhead speeds so that they can be used to grind, pulverize, granulate, or blend powder mixtures.
silicon carbide, the conventional abrasive commonly used to grind nonferrous materials.
Offers auger-feed, beside-the-press granulators, heavy-duty upright granulators, shredders, conveyors, parts separators, granulate removal systems and complete closed-loop reclaim systems that can separate, convey, shred, grind and reload molding machines.
Meyer and Siney, both former senior managers in the Internet Strategy consulting practice for PricewaterhouseCoopers and seasoned "road warriors," grew weary of the daily grind associated with business travel and developed a business plan to address travelers' desire for a faster, more personalized ground transportation service.