Thoughts, also called Ideas, are objects that can be observed floating around mental worlds and non-mental areas. Mental Connection can be used to grapple onto them. "Stray thoughts" can be revealed using a Thought Tuner, allowing for multiple grappling points to spawn.
Dark Thoughts[]
Dark thoughts are purple colored versions of thoughts. They require specialized mental connection upgrades to grapple to. Grappling to dark thoughts can lead Raz to hidden collectibles.