Addresses two questions that may be unique to perceptual learning: What are the circumstances that produce learning? and What is the content of learning? Suggests a critical principle for each question. Provides a discussion of perceptual learning theory, how learning occurs, and what gets learned. Includes a 121-item bibliography. (DR)

Argues that mental images have functional properties similar to those of audiovisual media in that they can be intentionally and systematically used as the informational base for cognitive operations and as an aid to new learning. Experimental evidence is cited to support the claims. Nineteen references are cited. (Author/CHC)