Eventually we may have sufficiently fine-grained ability to observe brain states, plus a strong enough understanding of neuropsychology, such that an outside ob

Eventually we may have sufficiently fine-grained ability to observe brain states, plus a strong enough understanding of neuropsychology, such that an outside observer can accurately predict, for a brain under observation: 1. The subjective internal mental state of the participant (e.g. "you were imagining a red balloon") 2. Actions that will be taken before they physically manifest (e.g. "you will throw rock instead of scissors") If an outside observer can do these things without access to subjects' thoughts, especially with subjects' deliberate efforts to fool the observers, then IMO it is pretty clear evidence the thoughts are meaningless. As for the current day, I say the preponderance of evidence is on anyone who claims otherwise. There's lots of evidence suggesting free will is an illusion, and no evidence of telekinesis or the like.