I copied this from wikepeadia:

Munenori in Fiction and Legend

Like his father, and his son Jubei, Munenori has achieved a degree of legendary status. A number of exaggerated tales and abilities have been attributed to him.

One of the most often repeated is the tale of his amazing sense of danger approaching. He was meditating in his garden facing away from the door when his assistant brought him his sword silently and without any declarations. His assistant, being a young and imaginative sort of person, thought to himself how it would be interesting to see if he could attack Munenori from this position. Before he could act on the fantasy, Munenori leapt to his feet and turned around, stunned to discover only his assistant was behind him. He was sure there was some impending danger.

Later on he was still troubled by the event. How could he have mistaken his assistant for impending danger? Was he losing his edge? He spoke of the incident to one of his trusted advisors while his assistant was in the room, and, being a virtuous youth, his assistant admitted that he had "thought" about attacking him earlier, but made no physical movements in accordance with the attack. Therefore, Munenori concluded that he was not in fact losing his edge but had actually achieved a new level of swordsmanship, one where a man can anticipate impending danger even when people are thinking about it.

Do you think it can be systematically developed thru internal training?

Cheers,
John