The smallest spacing that can be perceived between parts of a pattern is known as

In one study, health psychologists compared the reading level of children who attended a school close to a noisy airport with that of children attending a school in a much quieter area. This type of study is an example of a(n):

A) community field trial. B) retrospective study. C) prospective study. D) randomized clinical trial.

Eli's grandmother speaks to him in normal adult speech. His grandfather speaks to him in infant-directed speech. If Eli is 4 months old, which would he prefer listening to?

a. his grandmother b. his grandfather c. both his grandmother and grandfather d. neither his grandmother or grandfather