Which of the following is an example of evidence showing that non-perceptual processes play a role in perception?
a. Perception of the steepness of a hill increases when the participants are wearing heavy backpacks.
b. A patient with blindsight (D.B.) experiences negative afterimages.
c. Texture gradients influence our perception of depth.
d. Removal of a portion of the right visual cortex results in a scotoma.
Question 2
Which threat occurs in nonequivalent group designs because the groups may have different participant characteristics?
a. history effects
b. instrumentation effects
c. regression toward the mean
d. assignment bias
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