Method and apparatus for measurement of neural response

A device for measuring a neural response evoked by a neural stimulus, the device comprising:

• at least a first sense electrode and a second sense electrode, the first and second sense electrodes being configured to be positioned at distinct locations along a neural pathway;
• a first measurement amplifier circuit configured to amplify signals from the first sense electrode;
• a second measurement amplifier circuit configured to amplify signals from the second sense electrode;
• and
• a control unit configured to apply the neural stimulus, the control unit further configured to make a first recording of a first compound action potential evoked by the neural stimulus, the first recording being made using the first measurement amplifier circuit and the first sense electrode, the control unit further configured to make, simultaneously with the first recording, a second recording of the first compound action potential evoked by the stimulus, the second recording being made using the second measurement amplifier circuit and the second sense electrode;
• wherein the first measurement amplifier circuit has a first transfer function and the second measurement amplifier circuit has a second transfer function, and wherein the second transfer function differs from the first transfer function in a manner corresponding to a variation in the first compound action potential as the first compound action potential travels between the first sense electrode and the second sense electrode.