"Do we need to memorize that?" or cognitive science for chemists

In introductory chemistry courses, should students be encouraged to solve problems by reasoning based on conceptual understanding or by applying memorized facts and algorithms? Cognitive scientists have recently studied this issue with the assistance of new technologies. In the current consensus model for cognition, during problem solving the brain relies on "working memory" to sequentially process small elements of knowledge. Working memory is able to hold and manipulate virtually all elements that can be recalled "with automaticity" from long-term memory, but very few elements that are not recallable. As one consequence, students can reliably solve well-structured science problems only if most of the facts and algorithms needed to solve the problem have previously been well memorized. To achieve automaticity in recall, facts and procedures must be committed to memory (assimilated) and then tagged with associations to other knowledge (accommodated) in the brain's conceptual frameworks. Accommodation can be assisted by guided inquiry. Articles citing methods that can assist students in the development of automaticity are listed, and implications for chemistry instruction are discussed.