Professor Reber is the author of a Dictionary of Psychology
Here are a few entries:"Implicit Learning": A term coined by A.S. Reber for learning that takes place largely independent of awareness of both the process of acquisition and the content of the knowledge so acquired. Material that has been learned in this fashion, often termed "procedural knowledge", can be used to guide behavior, make decisions and solve problems, although the individual is tyically unaware of the complex knowledge held that enables him or her to act in this fashion.
"Explicit Learning": Learning that takes place consciously and results in knowledge that is available to consciousness; learning of which one is aware.