Medical scholars of ancient times. In the

Huangdi Neijing Suwen-Yijing Bianqi Lun, when Qibo answered Huangdi's question, he mentioned his teacher: "The color and pulse are valued by the Emperor (the ancient emperor) and passed down by the previous teacher. In ancient times, Jiudaiji was employed to understand the color and pulse and comprehend mental activity, integrating them with metal, wood, water, and earth, the four seasons, Bafeng (EX-LE10), and the six pairs of meridians, without departing from their norms. By observing their changes and shifts, one can perceive their subtleties and grasp their essentials. To understand these essentials, the color and pulse are key."

The Ming Dynasty physician Xu Chun-fu said: "Jiudaiji was a person from the time of Huangdi, and the teacher of Qibo. Qibo engaged in dialogues with him, which were recorded in the Neijing."