(a) Data

(b) Local maxima lines-singularity

(c) Sum over local maxima

(d) Coefficients at maximal scale

(e) Hölder exponent

(f) Multifractal spectrum

Figure 5: (a) Data of changes in concentrations of Oxy-Hb (b) Local maxima line (c) Partition functions (d) Wavelet coefficiens at the maximum scale (e) Scaling exponents (f) Multifractal spectrum.