I experience precognition, deja vu, and knowing in distinctly different ways.
for me is when I find myself in a conversation or situation where I've already experienced what will happen next. Like what the other person is going to say. But before it happens, I don't know it's going to, and I get those shivers of 'I've experienced this before'. I remember when my daughter was teaching in Japan and visited Nagoa Castle, she rung me on her cell and said 'Mum, I can describe what was in the next room, before I enter, as I was walking through.' Yet she'd never been there before. It wasn't past life, as she saw it exactly as it is today. I think in our dreams, we enter a timeless zone and skip ahead of ourselves. Deja vu for me is usually around incidental stuff.
Is where I get visions and sensations of something significant before it happens. Like feeling ourwhelmed by grief and then a couple of days later someone close dies or very clear visions of someone being sick or an event that overwhelms me to the degree that words spontaneously come out of my mouth although I don't actually know what I'm saying. I'll get fragmented images, words and feelings.
Is when I just know something without the 'hows' and 'whys'. Like the time I was insistent my son ride his bike to school instead of taking the bus. I just knew he had to ride his bike that day. The bus driver ran over a kid at my son's bus stop that day. 'Knowing' comes in with a strong gut feeling that is unquestionable but you don't get the supporting information to justify it. I get that from my Mum who always 'knew' stuff and we learnt as kids to listen to her.
All three are more prevelant when I meditate regularly which can give me disconcerting feeling of being an observer in my life, rather than a participant.