When Susie was 18 months old, her mother stood behind her, helping her throw a bean bag into a bucket. As Susie's skill improved, her mother stepped back, letting her try on her own. This example best illustrates the concept of

When Oliver Sacks, Bob Wasserman, and Knut Nordby -- who was a vision

researcher with achromatopsia -- arrived on Pingelap, Nordby was the only one who noticed that some of the children there were squinting and covering their eyes. This is an example of (a) perceptual learning (b) classical conditioning (c) operant learning (d) Nordby's above average intelligence

The process of mixing lights of different wavelengths is called additive color mixing

a. True b. False