MNEMONIC

any device for aiding the memory. Named for Mnemosyne, the personification of memory in Greek mythology, mnemonics are also called memoria technica. The principle is to create in the mind an artificial structure that incorporates unfamiliar ideas or, especially, a series of dissociated ideas that by themselves are difficult to remember. Ideally, the structure is designed so that its parts are mutually suggestive. Grouping items in rhymed verse has long been a popular mnemonic technique, from the gender rhymes of the Latin grammars to the verse for remembering the number of days in the months (Thirty days hath September, April, June and November . . . ). Numerous attempts have been made to invent mnemonic systemsgeneralized codes to improve all-around capacity to remember. The Greek and Roman system of mnemonics was founded on the use of mental places and signs or pictures in terms of the location of the items of interest. The method combines a familiar structure (locus) and the item or thing to be remembered (res). This mnemonic method, which is referred to as loci et res, is an effective way to remember a series of items in serial order. The most usual method is to choose a large house, of which the apartments, walls, windows, statues, and furniture were severally associated with certain names, phrases, events, or ideas by means of symbolic pictures; to recall these it is only necessary to search over the apartments of the house until the particular place is discovered where they had been deposited by the imagination. In accordance with this system, if it is desired to fix a historic date in the memory, it is localized in an imaginary town divided into a certain number of districts, each with 10 houses, each house with 10 rooms, and each room with 100 quadrates, or memory places, partly on the floor, partly on the four walls, partly on the roof. Using this system, the traditional date of the invention of printing in Europe (1440) could be fixed in the memory by mentally placing a book or some other symbol of printing in the 40th quadrate, or memory place, of the 4th room of the 1st house of the imaginary town. Scientific interest in mnemonics was heightened in 1968 when the renowned Soviet psychologist Aleksandr R. Luria wrote The Mind of a Mnemonist, which suggested the field was worthy of deeper psychological study. Luria was particularly impressed with the ability of individuals to remember long lists of numbers for periods of years. Mnemonists use a variety of procedures to facilitate recall. One method, called linking, associates any pair of itemsa pen and a chair, for exampleand then links those items with a third, the chain proceeding indefinitely. Interaction, and not mere association, is necessary; one could imagine the pen writing on the chair. This method has proven effective with grammar-school children as well as with adults. Other methods include rhymes (i before e, except after c) or substitution (the name Tchaikovsky can become chew-cow-ski; Reagan becomes ray-gun; etc.). One point stressed by mnemonists is that the imagery has to be bizarre if it is to be effective. Simple or common associations are said to be quickly forgotten. In fact, mnemonic devices, all of which depend upon the use of some method of coding of what is to be remembered, may be very useful in limited fields, especially if the coding is made up by the person who is going to use it. Completely generalized and impersonal mnemonic systems are apt to break down, largely because of their inevitable complexity and ambiguity; thus their importance has declined.