Alex Is on a Ritual Fast in Which He Will

Alex is on a ritual fast in which he will avoid eating any food for the next forty-eight hours. As the fast continues, Alex finds that he thinks more and more about food, but he does not eat. While watching television, though, he notes that there seem to be more ads for food than usual. There are actually no more food ads today than there usually are, but Alex's perception best illustrates

A) top-down processing.
B) bottom-up processing.
C) feature detection.
D) visual dominance.