The Soul Stones' Origin
With his stats pumped up like this, Jake's previously damaged Spirit Body was showing distinct signs of recovery despite the slowly worsening headache piling up at his temples. He was already able to release his Spirit Body out of his body.
As he regained his full mental capacity and beyond, he found that the trauma to his Spirit Body had caused him some cognitive damage. He had been feeling normal, but his mental clarity and ability to think had been affected despite not being aware of it previously.
It was only with this temporary intelligence power-up that he finally noticed it. Even with a migraine, he felt more lucid than ever before, and certain options and clues that his mind had previously overlooked suddenly became obvious.