Figure 6.

Illustration of heat diffusion on cortical structure. Two boundaries are examples of pial and white matter surfaces. (a) Heat diffusion illustration with spectrum; (b) diffusion distance illustrated as random walk. Our heat kernel method may be able to capture the subtle difference determined by the intrinsic geometry structures because it estimates the heat transition probability on every intermediate point such that it may capture more regional information than other harmonic function methods (e.g. Jones et al., 2000).