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 ?
On the eve of the big build, following horrendous weather reports for the festival run-in and for the festival itself, organisers have had to make the tough decision to pull the event on health and safety grounds.
Inspector Penny Davies, who dismissed the appeal on highway safety grounds, said: "Myrtle Grove is narrow with on-going parking pressure and limited facilities for pedestrians.
The remainder of the meeting was abandoned on safety grounds after the incident, in which Stephens, 21, was injured during his fall from Titian Flame in the Weatherbys Insurance Handicap Hurdle.
We have recalled this product purely on safety grounds.
Yesterday it was reported that British diplomats were told by the Foreign Office not to use Alliance Air a fortnight ago after Rolls-Royce withdrew a contract for its engines on safety grounds.
Aero Zambia has been grounded after the Transport and Communication Minister Nkandu Luo refused to renew the carrier`s operating licence on safety grounds.
But Bernie Ecclestone defended the current rules saying it was time drivers "used their brains" and the FIA rule-makers stepped in, insisting changes could only be made on safety grounds.
However, Ian Brooke, chairman of Huddersfield Save Our Services, who spent a night at the protest, said: "There are no health and safety grounds as to why the cathedral should have to be shut, in fact many tourists and members of the public come in and tour the camp talking to protesters and reading literature.
ONE of the top fell-running events in the UK has been cancelled on health and safety grounds - because of fears it might see its first road casualty in 30 years.
Senior staff at Ysgol Glan Clwyd in St Asaph decided the school cannot be opened today on health and safety grounds.
Coun Nigel Dawkins has campaigned in recent years to prevent the pool from being filled in on safety grounds.
I have spoken to Queens College and learned that the reason for the felling of the tree was on health and safety grounds.