A neural stimulus system configured to apply a first stimulus in order to evoke a neural response, the neural stimulus system comprising: an electrode array comprising one or more first stimulating electrodes, one or more second stimulating electrodes other than the one or more first stimulating electrodes, and one or more sense electrodes other than the one or more first stimulating electrodes, means for electrical artefact compensation in measurement of the neural response configured to apply a compensatory stimulus; wherein the first stimulus includes a first phase during which an electrical stimulus of first polarity is applied, and a second phase, subsequent to the first phase, during which an electrical stimulus of a second polarity opposite to the first polarity is applied; characterised in that: the means for electrical artefact compensation comprises: means for measuring an effectiveness of a previously applied compensatory stimulus, wherein the means for measuring an effectiveness of a previously applied compensatory stimulus comprises: means for obtaining at least one neural response measurement of an actual performance of the previously applied compensatory stimulus by means of the one or more sense electrodes; means for comparing the actual performance against a target performance, in order to determine an error between the actual performance and the target performance; and means configured for adjusting the compensatory stimulus to reduce the error; wherein the neural stimulus system is configured to apply the first stimulus to the one or more first stimulating electrodes; wherein the means for electrical artefact compensation is configured to apply; the compensatory stimulus to the one or more second stimulating electrodes, and to adjust an amplitude of the compensatory stimulus, or an amplitude and a duration of the compensatory stimulus, to substantially compensate for time varying stimulus artefact caused by charge redistribution during the first stimulus. an electrode array comprising one or more first stimulating electrodes, one or more second stimulating electrodes other than the one or more first stimulating electrodes, and one or more sense electrodes other than the one or more first stimulating electrodes, means for electrical artefact compensation in measurement of the neural response configured to apply a compensatory stimulus; wherein the first stimulus includes a first phase during which an electrical stimulus of first polarity is applied, and a second phase, subsequent to the first phase, during which an electrical stimulus of a second polarity opposite to the first polarity is applied; the means for electrical artefact compensation comprises: means for measuring an effectiveness of a previously applied compensatory stimulus, wherein the means for measuring an effectiveness of a previously applied compensatory stimulus comprises: means for obtaining at least one neural response measurement of an actual performance of the previously applied compensatory stimulus by means of the one or more sense electrodes; means for comparing the actual performance against a target performance, in order to determine an error between the actual performance and the target performance; and means configured for adjusting the compensatory stimulus to reduce the error; wherein the neural stimulus system is configured to apply the first stimulus to the one or more first stimulating electrodes; wherein the means for electrical artefact compensation is configured to apply; the compensatory stimulus to the one or more second stimulating electrodes, and to adjust an amplitude of the compensatory stimulus, or an amplitude and a duration of the compensatory stimulus, to substantially compensate for time varying stimulus artefact caused by charge redistribution during the first stimulus. means for obtaining at least one neural response measurement of an actual performance of the previously applied compensatory stimulus by means of the one or more sense electrodes; means for comparing the actual performance against a target performance, in order to determine an error between the actual performance and the target performance; and means configured for adjusting the compensatory stimulus to reduce the error; wherein the neural stimulus system is configured to apply the first stimulus to the one or more first stimulating electrodes; wherein the means for electrical artefact compensation is configured to apply; the compensatory stimulus to the one or more second stimulating electrodes, and to adjust an amplitude of the compensatory stimulus, or an amplitude and a duration of the compensatory stimulus, to substantially compensate for time varying stimulus artefact caused by charge redistribution during the first stimulus.