Giovanni Was Watching the Night Sky on a Clear Evening

question 107

Multiple Choice

Giovanni was watching the night sky on a clear evening in November.He noticed that sometimes when he looked directly overhead he could detect a very faint star.A few minutes later it seemed that the star had disappeared,and then it "appeared" again.In this case,it is very likely that the light from the star was

• A) just below Giovanni's level for perceptual invariance.
• B) producing action potentials that were too weak to reach the terminal buttons.
• C) just at Giovanni's absolute threshold for light.
• D) producing inhibitory synapses rather than excitatory synapses.

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Definitions:

Color-Blind Eye

A condition whereby an individual has difficulty distinguishing between certain colors, typically red and green.

Color Language

The way in which languages influence and categorize perceptions and concepts of colors among their speakers.

Described

Having been given a detailed account or depiction of something in words.

Young-Helmholtz Theory

A theory of color vision proposing that the eye contains three types of color receptors sensitive to red, green, and blue, which can produce the perception of all colors through their combined activity.