Examlex
In Pavlov's studies on classical conditioning,the bell was a(n) _____ before it was paired with the food.
Shades
Variations or different tones of colors, often used to describe subtle differences in color.
Distinguish
To recognize or treat (someone or something) as different, or to identify the distinct characteristics that set someone or something apart.
Color Blindness
A visual impairment in which a person has difficulty distinguishing between certain colors, typically red and green or blue and yellow.
Reds And Greens
Refers to the basic colors detected by the cones in the human eye, fundamental to color vision theories.
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