The method of loci (loci being Latin for 'places') is a method of memory enhancement which uses visualizations with the use of spatial memory, familiar information about one's environment, to quickly and efficiently recall information. The method of loci is also known as the memory journey, memory palace, or mind palace technique. This method is a mnemonic device adopted in ancient Roman and Greek rhetorical treatises (in the anonymous Rhetorica ad Herennium, Cicero's De Oratore, and Quintilian's Institutio Oratoria). Many memory contest champions report using this technique to recall faces, digits, and lists of words.'the method of loci', an imaginal technique known to the ancient Greeks and Romans and described by Yates (1966) in her book The Art of Memory as well as by Luria (1969). In this technique the subject memorizes the layout of some building, or the arrangement of shops on a street, or any geographical entity which is composed of a number of discrete loci. When desiring to remember a set of items the subject 'walks' through these loci in their imagination and commits an item to each one by forming an image between the item and any feature of that locus. Retrieval of items is achieved by 'walking' through the loci, allowing the latter to activate the desired items. The efficacy of this technique has been well established (Ross and Lawrence 1968, Crovitz 1969, 1971, Briggs, Hawkins and Crovitz 1970, Lea 1975), as is the minimal interference seen with its use. The method of loci (loci being Latin for 'places') is a method of memory enhancement which uses visualizations with the use of spatial memory, familiar information about one's environment, to quickly and efficiently recall information. The method of loci is also known as the memory journey, memory palace, or mind palace technique. This method is a mnemonic device adopted in ancient Roman and Greek rhetorical treatises (in the anonymous Rhetorica ad Herennium, Cicero's De Oratore, and Quintilian's Institutio Oratoria). Many memory contest champions report using this technique to recall faces, digits, and lists of words. The term is most often found in specialised works on psychology, neurobiology, and memory, though it was used in the same general way at least as early as the first half of the nineteenth century in works on rhetoric, logic, and philosophy. John O'Keefe and Lynn Nadel refer to: The items to be remembered in this mnemonic system are mentally associated with specific physical locations. The method relies on memorized spatial relationships to establish order and recollect memorial content. It is also known as the 'Journey Method', used for storing lists of related items, or the 'Roman Room' technique, which is most effective for storing unrelated information. Many effective memorisers today use the 'method of loci' to some degree. Contemporary memory competition, in particular the World Memory Championship, was initiated in 1991 and the first United States championship was held in 1997. Part of the competition requires committing to memory and recalling a sequence of digits, two-digit numbers, alphabetic letters, or playing cards. In a simple method of doing this, contestants, using various strategies well before competing, commit to long-term memory a unique vivid image associated with each item. They have also committed to long-term memory a familiar route with firmly established stop-points or loci. Then in the competition they need only deposit the image that they have associated with each item at the loci. To recall, they retrace the route, 'stop' at each locus, and 'observe' the image. They then translate this back to the associated item. For example, Ed Cooke, a World Memory Champion Competitor, describes to Josh Foer in his book Moonwalking with Einstein how he uses the method of loci. First, he describes a very familiar location where he can clearly remember many different smaller locations like his sink in his childhood home or his dog's bed. Cooke also advises that the more outlandish and vulgar the symbol used to memorize the material, the more likely it will stick. Memory champions elaborate on this by combining images. Eight-time World Memory Champion Dominic O'Brien uses this technique. The 2006 World Memory Champion, Clemens Mayer, used a 300-point-long journey through his house for his world record in 'number half marathon', memorising 1040 random digits in a half-hour. Gary Shang has used the method of loci to memorise pi to over 65,536 (216) digits. The technique is taught as a metacognitive technique in learning-to-learn courses. It is generally applied to encoding the key ideas of a subject. Two approaches are: The method of loci has also been shown to help sufferers of depression remember positive, self-affirming memories. A study at the University of Maryland evaluated participants ability to accurately recall two sets of familiar faces, using a traditional desktop, and with a head-mounted display. The study was designed to leverage the method of loci technique, with virtual environments resembling memory palaces. The study found an 8.8% recall improvement in favor of the head-mounted display, in part due to participants being able to leverage their vestibular and proprioceptive sensations. The Rhetorica ad Herennium and most other sources recommend that the method of loci should be integrated with elaborative encoding (i.e., adding visual, auditory, or other details) to strengthen memory. However, due to the strength of spatial memory, simply mentally placing objects in real or imagined locations without further elaboration can be effective for simple associations.