Parts of the central nervous system characterised by their relatively whitish appearance. The appearance is due to the presence of a large percentage of myelinated axons and the myelin contributes to the whitish appearance.

In this test, subjects are presented with a three-letter word-fragment and asked to write down the first word they think of, or that had appeared on the previously presented list. Subsequently, subjects are asked to complete fragments. The score is the number of completed words that were elicited.

Memory where information is only stored for the period of time in which it is needed.

Closure of a wound by contraction of a ring of contractile cells differentiated from fibroblasts, producing a continuous layer of dermis which covers the wound.