Cranial is not the best word, Pauls's approach would better fall under the title of Visceral. He paid no attention to bones and sutures and claimed to feel interacting spirals whan he placed his hands on a person's skull.
This news recently in:
https://www.sydney.edu.au/news-opinion/news/2023/06/16/scientists-discover-spiral-shaped-signals-that-organise-brain-activity.html#:~:text=Scientists%20discover%20spiral%2Dshaped%20signals%20that%20organise%20brain%20activity,-16%20June%202023&text=University%20of%20Sydney%20and%20Fudan,themselves%20to%20resemble%20swirling%20spirals.