Your textbook discusses research showing that people have better acuity for mental images that are visualized in the center of the retina, rather than in the periphery of the retina.
The reason that this research is significant is that:
a.it offers strong support for the propositional approach to mental images.
b.it demonstrates that the previous imagery research had been influenced by experimenter expectancy.
c.the research is similar to the results obtained when people perceive actual visual stimuli.
d.it demonstrates that individual differences in visual imagery are actually very small.