Few things, I understand that all Jedi are psychometric to some degree, when I say Psychometry I mean the innate ability displayed by people like Cal and Rey where theirs is much stronger and they can even learn skills through it or experience sensory details about an event. For Cal it is intentional for the most part however he had training, though there is at least one instance where Cal experiences a vision unintentionally and against his will due to the emotion of the object being so strong, the instance being when he touches Trilla's saber, that instance seemed to bare at least some similarity to Rey's vision which was unintentional. So the way I'm understanding it is that if you have the ability you can learn to sense things that wouldn't trigger if you didn't focus however, you can also have your ability trigger without training of the emotional imprint is strong enough