Post History
You could use a color change, eg. put the telepathic communication in a lighter gray color which could induce a focus change in the reader (leaning close and squinting) salient to telepathy.
Answer
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/44016 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/