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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 ?
Reports that these attacks came from Chinese schools are totally groundless and the accusation of Chinese government involvement is also irresponsible and driven by ulterior motives," Qin said.
Groundless optimism is dangerous but I think that groundless pessimism is also dangerous.
The Ministry of Defence have so far opposed a public inquiry into Deepcut, also arguing that investigations by the Royal Military Police (RMP) had concluded that claims of bullying and abuse of recruits were groundless.
A A The article, it said, includes groundless facts and false information on the health of His Majesty the King, contrary to the truth included in the official communique issued by the Ministry of Royal Household, Protocol and Chancellery and signed by the personal doctor of the monarch.
Nestle Hellas will immediately take legal action to defend its rights and rid itself of these groundless charges.
The five-time African champions announced on their official website that the 28-year-old is an indispensable figure, and all allegations about his departure are completely groundless.
The Talmud uses this story to teach the terrible consequences of groundless hatred.
has taken an approach aimed at leaving our company in a difficult position with false, unreal and groundless allegations," Goldas said.
But the claim was determined to be groundless and lacked medical or genetic evidence, said Colin Williams, of the independent public prosecutor's office.
He refuted suggestions that he had been disruptive at meetings and said a claim he had been responsible for printing or distributing a leaflet to tenants in high rise flats had also been groundless.
This paranoid and groundless frenzy has been fomented and promoted by a shameless collection of lunatics and losers; crooks, cranks, demagogues and opportunists, who claim the existence of a top-secret master plan to join the U.
The annual Report on International Religious Freedom ''continues groundless accusations against China of its religious and ethnic policies,'' Qin Gang said in a statement posted on the ministry's website.