phosphene

phos·phene

P0257500 (fŏs′fēn′)n. A sensation of light caused by excitation of the retina by mechanical or electrical means rather than by light, as when the eyeballs are pressed through closed lids.

[French phosphène : Greek phōs, light; see phos- + Greek phainein, to cause to appear, to show; see bhā- in Indo-European roots.]

phosphene

(ˈfɒsfiːn) n (Physiology) the sensation of light caused by pressure on the eyelid of a closed eye or by other mechanical or electrical interference with the visual system[C19: from Greek phōs light + phainein to show]

phos•phene

(ˈfɒs fin)

n. a luminous visual image produced by mechanical stimulation of the retina, as when pressing on closed eyelids. [1870–75; < French phosphène, irreg. < Greek phôs light (contraction of pháos) + phaínein to show, shine]

Translations

Phosphene

phosphene

[′fäs‚fēn] (psychology) Sensation of spots of light in the visual field due to a stimulus other than light, such as pressure on the eyeball or an electrical stimulus to the retina or visual pathway.

Phosphene

a visual sensation that occurs in man without the action of light on the eyes.

Phosphenes may appear spontaneously in the dark, or they may be induced by mechanical pressure on closed eyes, by the chemical action of psychotropic agents on the central nervous system, or by the electrical excitation of the retina through electrodes placed on the temples. They can also be induced by direct electrical excitation of the visual centers of the cerebral cortex.

Phosphenes may be bluish, greenish, yellowish, or orange in color; their shapes are varied. When phosphenes are produced by excitation of the visual centers of the cerebral cortex, the subject ceases to see his surroundings and sees only light spots, which move with the eye movements. The excitation of adjacent regions of the cortex produce phosphenes of geometric and other shapes.

Phosphenes are not seen by persons blind from birth, but they may be induced in individuals who have become blind. Therefore, attempts are being made to create visual prostheses using artificial excitation of phosphenes. Phosphenes seen by a person in the presence of illumination sometimes blend with the images he sees of the real world, thereby creating visual illusions. Bright phosphenes may be a symptom of disease.

REFERENCES

Luriia, A. R. Vysshie korkovye funktsii cheloveka i ikh narusheniia pri lokal’nykh porazheniiakh mozga. Moscow, 1962.
Oster, G. “Fosfeny.” Nauka i zhizn, 1971, no. 4.N. A. VALIUS

phosphene

[fos´fēn] an objective visual sensation that occurs with the eyes closed, and in the absence of retinal stimulation by visible light.

phos·phene

(fos'fēn), Sensation of light produced by mechanical or electrical stimulation of the peripheral or central optic pathway of the nervous system. [G. phōs, light, + phainō, to show]

phosphene

(fŏs′fēn′)n. A sensation of light caused by excitation of the retina by mechanical or electrical means rather than by light, as when the eyeballs are pressed through closed lids.

phos·phene

(fos'fēn) Sensation of light produced by mechanical or electrical stimulation of the peripheral or central optic pathway of the nervous system. [G. phōs, light, + phainō, to show]

phosphene

A visual sensation arising from stimulation of the retina by something other than light. The stimulation can be either electrical, mechanical (e.g. a blow to the head or pressure on the eyeball), or some electromagnetic waves such as X-rays. See entoptic image; photopsia; adequate stimulus.

单词	phosphene
释义	phosphene phos·phene P0257500 (fŏs′fēn′)n. A sensation of light caused by excitation of the retina by mechanical or electrical means rather than by light, as when the eyeballs are pressed through closed lids. [French phosphène : Greek phōs, light; see phos- + Greek phainein, to cause to appear, to show; see bhā- in Indo-European roots.] phosphene (ˈfɒsfiːn) n (Physiology) the sensation of light caused by pressure on the eyelid of a closed eye or by other mechanical or electrical interference with the visual system[C19: from Greek phōs light + phainein to show] phos•phene (ˈfɒs fin) n. a luminous visual image produced by mechanical stimulation of the retina, as when pressing on closed eyelids. [1870–75; < French phosphène, irreg. < Greek phôs light (contraction of pháos) + phaínein to show, shine] Translations Phosphene phosphene [′fäs‚fēn] (psychology) Sensation of spots of light in the visual field due to a stimulus other than light, such as pressure on the eyeball or an electrical stimulus to the retina or visual pathway. Phosphene a visual sensation that occurs in man without the action of light on the eyes. Phosphenes may appear spontaneously in the dark, or they may be induced by mechanical pressure on closed eyes, by the chemical action of psychotropic agents on the central nervous system, or by the electrical excitation of the retina through electrodes placed on the temples. They can also be induced by direct electrical excitation of the visual centers of the cerebral cortex. Phosphenes may be bluish, greenish, yellowish, or orange in color; their shapes are varied. When phosphenes are produced by excitation of the visual centers of the cerebral cortex, the subject ceases to see his surroundings and sees only light spots, which move with the eye movements. The excitation of adjacent regions of the cortex produce phosphenes of geometric and other shapes. Phosphenes are not seen by persons blind from birth, but they may be induced in individuals who have become blind. Therefore, attempts are being made to create visual prostheses using artificial excitation of phosphenes. Phosphenes seen by a person in the presence of illumination sometimes blend with the images he sees of the real world, thereby creating visual illusions. Bright phosphenes may be a symptom of disease. REFERENCES Luriia, A. R. Vysshie korkovye funktsii cheloveka i ikh narusheniia pri lokal’nykh porazheniiakh mozga. Moscow, 1962. Oster, G. “Fosfeny.” Nauka i zhizn, 1971, no. 4.N. A. VALIUS phosphene phosphene [fos´fēn] an objective visual sensation that occurs with the eyes closed, and in the absence of retinal stimulation by visible light. phos·phene (fos'fēn), Sensation of light produced by mechanical or electrical stimulation of the peripheral or central optic pathway of the nervous system. [G. phōs, light, + phainō, to show] phosphene (fŏs′fēn′)n. A sensation of light caused by excitation of the retina by mechanical or electrical means rather than by light, as when the eyeballs are pressed through closed lids. phos·phene (fos'fēn) Sensation of light produced by mechanical or electrical stimulation of the peripheral or central optic pathway of the nervous system. [G. phōs, light, + phainō, to show] phosphene A visual sensation arising from stimulation of the retina by something other than light. The stimulation can be either electrical, mechanical (e.g. a blow to the head or pressure on the eyeball), or some electromagnetic waves such as X-rays. See entoptic image; photopsia; adequate stimulus.
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