
it literally implies that it can be used by normal senses with just this statement.
Precognition: knowledge of a future event or situation, especially through extrasensory means.
Especially: used to single out one person, thing, or situation over all others. (NOT EXCLUDED ALL OTHERS COMPLETELY, BUT NOTING THE ONE THING ABOVE ALL.)
"he despised them all, especially Sylvester"
synonyms: mainly, mostly, chiefly, principally, largely;
It says "especially" through extrasensory means. Especially means "mainly, largely, commonly or usually". These words mean more so than not. In no way, shape or form does it say that extrasensory is the "only" means of using precognition, it is simply the most common and typical. When people think of the ability to see the future, they think of having visions through the mind. Like you, they have such a simplistic and naive, typical perspective of precognition. However, by the definition right above you, it is directly basically, no literally saying "knowledge of a future event, usually but
not only used through extrasensory means". because, you know, not everyone uses precognition through their eyes, it's always been through mind, until Naruto introduced a more visual aspect. Show me a definition that says "foreknowledge of an event, "ONLY" through extrasensory means" and i'll be inclined to agree with you.