A versatile averaging system for neurophysiology.

This paper describes a fully developed and versatile PDP 11-based averaging system for the neurophysiology laboratory. Data collection parameters can be varied with ease. A hardware pseudo-random timer is provided to control patient stimulation in cerebral evoked response measurements. Quantitative data analysis programs are provided. EMG contamination in cerebral evoked response measurements is minimised and information on the patient's habituation to the stimulus is automatically extracted. To find broad application the basic data collection program has been developed to run under either the disk operating system (DOS) or a real time sharing executive (RSX11D).