When a Sparkler Is Twirled Rapidly,people Perceive a Circle of Light.This

question 28

Multiple Choice

When a sparkler is twirled rapidly,people perceive a circle of light.This occurs because

• A)the trail you see is caused by sparks left behind from the sparkler.
• B)due to its differing wavelengths,the light from the sparkler continues to radiate for about a second after it goes out.
• C)the length of iconic memory (the persistence of vision)is about a fraction of a second.
• D)Gestalt principles work to complete the circle in our minds.

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Definitions:

Brain

The central organ of the human nervous system, responsible for processing sensory information, and controlling thoughts, memories, emotions, and motor skills.

Hemisphere

Half of the terrestrial globe or celestial sphere, especially one of the halves into which the earth is divided, either north-south by the equator or east-west by a meridian.

Phencyclidine (PCP)

Substance that produces euphoria, slowed reaction times, and involuntary movements at low doses; disorganized thinking, feelings of unreality, and hostility at intermediate doses; and amnesia, analgesia, respiratory problems, and changes in body temperature at high doses.

Perceptual Changes

Alterations in the way an individual interprets or experiences sensory information.