A monitoring or predicting system to detect the onset of a neurological episode the system comprising :a neurological electrical input the input being a digital representation of a neurologically derived signal a converter to convert the digital signal into a digital data string a pattern analyser to identify recurring patterns in the digital data string and a monitor to measure a pattern derived parameter wherein an output from the monitor gives an indication of the onset or occasion of a neuronal activity in dependence on the pattern derived parameter.
