1/f pattern is considered to be a fundamental property of nonlinear, complex dynamical systems studied across the physical and life sciences (Mandelbrot, 1998).
Van Orden, G. C., Holden, J. G., & Turvey, M. T. (2003). Self-organization of cognitive performance. Journal of experimental psychology. General, 132(3), 331-50. doi:10.1037/0096-3445.132.3.331