Synesthesia

SYNESTHESIA
Synesthesia, from the ancient Greek σύν (syn), "together," and αἴσθησις (aisthēsis), "sensation," is a neurologically based condition in which stimulation of one sensory or cognitivepathway leads to automatic, involuntary experiences in a second sensory or cognitive pathway. People who report such experiences are known as synesthetes.
In one common form of synesthesia, known asgrapheme → color synesthesia or color-graphemic synesthesia, letters or numbers are perceived as inherently colored, while in ordinal linguistic personification, numbers, days of the week and months ofthe year evoke personalities.In spatial-sequence, or number form synesthesia, numbers, months of the year, and/or days of the week elicit precise locations in space, or may have a view of a year as amap.
Yet another recently identified type, visual motion → sound synesthesia, involves hearing sounds in response to visual motion and flicker. Over 60 types of synesthesia have been reported, butonly a fraction have been evaluated by scientific research. Even within one type, synesthetic perceptions vary in intensity and people vary in awareness of their synesthetic perceptions.
MEMORYPROCESS
Numerous theoretical accounts of memory have differentiated memory for facts and memory for context. Psychologist Endel Tulving further defined these two declarative memory conceptions of explicitmemory (in which information is consciously registered and recalled) into semantic memory wherein general world knowledge not tied to specific events is stored and episodic memory involving thestorage of context-specific information about personal experiences (i.e. time, location, and surroundings of personal knowledge). Conversely, implicit memory (non declarative) involves perhaps unconsciousregistration (lack of awareness during encoding), yet definite unconscious recollection. Skills and habits, priming, and classical conditioning all utilize implicit memory.
An essential aspect of...