Chaotic neurodynamics in the cerebral cortex is theorized as expressing degrees of uncertainty resulting from ambiguity in computational tasks. The cortex is modeled as a nonlinear system of oscillator circuits connected in a laminar structure and selectively excited or suppressed by input stimuli. Its behavior is related to modes predicted by the theory such as low level chaotic activity believed to be the default response when no stimulation is applied to isolated areas of the cortex.