A device for applying a neural stimulus, the device comprising: at least two electrodes configured to be positioned alongside a neural pathway having a fibre population; and a control unit configured to: apply a sequence of therapeutic neural stimuli, the stimuli sequence comprising a first stimulus and a second stimulus delivered within a refractory period of the fibre population following the first stimulus, wherein the sequence of neural stimuli is applied sequentially to more than one of the at least two electrodes, wherein stimulus parameters of the second stimulus differ from stimulus parameters of the first stimulus in a manner that the second stimulus is capable of recruiting a further portion of the fibre population than the first stimulus; and control the timing of the respective stimuli in the sequence in order to cause spatiotemporal alignment of respective evoked responses propagating in a first direction along the nerve fibre to thereby cause correlation and summation of the evoked responses in the first direction, while causing spatiotemporal misalignment of the respective evoked responses propagating in a second direction opposite the first direction along the nerve fibre, to thereby decorrelate the evoked responses propagating in the second direction. at least two electrodes configured to be positioned alongside a neural pathway having a fibre population; and a control unit configured to: apply a sequence of therapeutic neural stimuli, the stimuli sequence comprising a first stimulus and a second stimulus delivered within a refractory period of the fibre population following the first stimulus, wherein the sequence of neural stimuli is applied sequentially to more than one of the at least two electrodes, wherein stimulus parameters of the second stimulus differ from stimulus parameters of the first stimulus in a manner that the second stimulus is capable of recruiting a further portion of the fibre population than the first stimulus; and control the timing of the respective stimuli in the sequence in order to cause spatiotemporal alignment of respective evoked responses propagating in a first direction along the nerve fibre to thereby cause correlation and summation of the evoked responses in the first direction, while causing spatiotemporal misalignment of the respective evoked responses propagating in a second direction opposite the first direction along the nerve fibre, to thereby decorrelate the evoked responses propagating in the second direction. apply a sequence of therapeutic neural stimuli, the stimuli sequence comprising a first stimulus and a second stimulus delivered within a refractory period of the fibre population following the first stimulus, wherein the sequence of neural stimuli is applied sequentially to more than one of the at least two electrodes, wherein stimulus parameters of the second stimulus differ from stimulus parameters of the first stimulus in a manner that the second stimulus is capable of recruiting a further portion of the fibre population than the first stimulus; and control the timing of the respective stimuli in the sequence in order to cause spatiotemporal alignment of respective evoked responses propagating in a first direction along the nerve fibre to thereby cause correlation and summation of the evoked responses in the first direction, while causing spatiotemporal misalignment of the respective evoked responses propagating in a second direction opposite the first direction along the nerve fibre, to thereby decorrelate the evoked responses propagating in the second direction.