Sometimes people are not telling outright lies; they just get so involved in a conversation that they begin exaggerating their experiences so that their stories sound better than the stories being told by others. Exaggerators have the same problems as liars, they forget their past exaggerations so their exaggerations are inconsistent; and sometimes, they began to believe their own exaggerations.
Sometimes people are not lying or exaggerating, they are just remembering things incorrectly. Sometimes, when we are having a difficult time remembering certain facts, we unconsciously fill in the gaps with things that are not necessarily true. However, unlike liars, when we remember the truth or find out the truth, we willingly correct our previous statements. This is not the same as a liar being trapped in a lie and then suddenly remembering the truth.
When talking with martial artists, knowing something about how memory works may help you sort out the truth in their statements. There are three types of memory: procedural, semantic, and episodic. Procedural memory is the strongest and longest lasting. For example, in Alzheimer patients, these are the last memories to go. Procedural memories consists of memories of how to perform some procedure that we have done so many times that we do not consciously think about how to do it, we just do it, such as walking, driving, or in the case of martial artists, sparring, or performing a pattern or a proper stance. Black belts will never forget how to perform a pattern or how to spar because they will have done these procedures so many times in their training that they become embedded in their memory.