7. Rods and cones convert ______into ______ (A)nerve impulses； brain waves. (B)light energy； electrical signals. (C) neural signals； images. (D) light impulses； colors and shapes.

5. A researcher repeatedly presents an image of a blue rectangle to a 4-month-old infant. After several presentations, the infant stops looking at the image. The researcher then presents the infant with the image of a red rectangle. The infant shows a renewed interest in this image and looks at it for as long as he had the blue rectangle initially. Which statement is not correct? (A)a 4-month-old infant can tell the difference between blue and red. (B)The researcher uses the repeat presentation paradigm to examine the perceptual ability in a 4-month-old infant. (C) The researcher uses the habituation paradigm to examine the perceptual ability in a 4-month-old infant. (D) This research cannot examine the shape discrimination in a 4-month-old infant.

7. Rods and cones convert into
(A)nerve impulses； brain waves.
(B)light energy； electrical signals.
(C) neural signals； images.
(D) light impulses； colors and shapes.

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