  Complex Schroedinger equation is transformed to spinor or coupled scalar
field equations replacing the imaginary unit $i$ by a matrix $\begin{bmatrix} 0
& 1 \\-1 & 0 \end{bmatrix}$. New perspecive on stochasic approach is developed
with spin as topological invariant and mass having stochastic origin in this
Spinor Random Field formalism.
