afterimage

/'ɑ:ftər,imidʤ/

Thân thiện

A person stares at a bright light and then sees an afterimage when looking away.

Definition

1. Noun:
   • A visual impression that remains after the original stimulus has been removed: An "afterimage" is an optical phenomenon where an image continues to appear in one's vision after the exposure to the original image has ended. It is often a complementary color (a negative image) of the original.

Usage Examples

• Noun:
  • After staring at the bright light, I saw a lingering afterimage when I closed my eyes.
  • The optical illusion creates a colorful afterimage if you look at the center dot for 30 seconds.

Advanced Usage

• Positive afterimage: A brief persistence of an image in its original colors, typically lasting only a fraction of a second after the stimulus ends.
  • The sparkler left a brief positive afterimage of its trail in the dark sky.
• Negative afterimage: A more common type where the colors of the persistent image are inverted or complementary to the original stimulus.
  • Staring at the red circle produced a green afterimage on the white wall.

Variants and Related Words

• Aftereffect (n): A broader term for any effect that follows after the cause has been removed, not limited to vision.
  • The dizziness was an aftereffect of the medication.
• Persistence of vision (n phrase): The technical optical phenomenon that explains afterimages, where the retina retains an image briefly.
  • Animation relies on the persistence of vision to create the illusion of motion.

Synonyms

• Phosphene: A phenomenon of seeing light without light actually entering the eye, often caused by pressure or stimulation, which can be related.
• Ghost image: An informal term sometimes used for a faint, secondary, or persistent image.

Related Phrases

• To have an afterimage: To experience this visual phenomenon.
  • I still have an afterimage of the camera flash.
• To leave an afterimage: For a stimulus to cause this effect.
  • The bright sun left a strong afterimage.

Idioms and Figurative Use

• While not a common idiom, "afterimage" can be used metaphorically to describe a lasting memory or impression.
  • The tragic event left an emotional afterimage that haunted her for years.

Học thuật

Noun

1. an image (usually a negative image) that persists after stimulation has ceased

Từ đồng nghĩa

• aftersensation