A method of tracking visual attention, the method comprising: obtaining a base image; generating at least one visual stimulus, each stimulus having a characteristic modulation, the characteristic modulation being applied to high spatial frequency, HSF, components (502, 505, 508, 511, 603) of the visual stimulus, the HSF components (502, 505, 508, 511, 603) having a spatial frequency higher than a predetermined high spatial frequency threshold; displaying the or each visual stimulus via a graphical user interface, GUI, of a display, wherein displaying the or each visual stimulus comprises: merging the or each visual stimulus with the base image to provide a blended image; and displaying the blended image via the GUI; receiving neural signals of a user from a neural signal capture device; and when the user views the or each visual stimulus, determining a point of focus of the user in the blended image based on the neural signals, the neural signals including information associated with the characteristic modulation of a visual stimulus to which the user's visual attention is directed; wherein generating the stimulus includes: processing the base image into segmented display objects (501, 601); for each segmented display object, filtering the segmented display objects (501, 601) into high spatial frequency, HSF, components (502, 505, 508, 511, 603) and low spatial frequency, LSF, components (503, 506, 509, 512, 604); and applying a temporal modulation in the HSF components (502, 505, 508, 511, 603) of the segmented display objects (501, 601). obtaining a base image; generating at least one visual stimulus, each stimulus having a characteristic modulation, the characteristic modulation being applied to high spatial frequency, HSF, components (502, 505, 508, 511, 603) of the visual stimulus, the HSF components (502, 505, 508, 511, 603) having a spatial frequency higher than a predetermined high spatial frequency threshold; displaying the or each visual stimulus via a graphical user interface, GUI, of a display, wherein displaying the or each visual stimulus comprises: merging the or each visual stimulus with the base image to provide a blended image; and displaying the blended image via the GUI; merging the or each visual stimulus with the base image to provide a blended image; and displaying the blended image via the GUI; receiving neural signals of a user from a neural signal capture device; and when the user views the or each visual stimulus, determining a point of focus of the user in the blended image based on the neural signals, the neural signals including information associated with the characteristic modulation of a visual stimulus to which the user's visual attention is directed; wherein generating the stimulus includes: processing the base image into segmented display objects (501, 601); for each segmented display object, filtering the segmented display objects (501, 601) into high spatial frequency, HSF, components (502, 505, 508, 511, 603) and low spatial frequency, LSF, components (503, 506, 509, 512, 604); and applying a temporal modulation in the HSF components (502, 505, 508, 511, 603) of the segmented display objects (501, 601). processing the base image into segmented display objects (501, 601); for each segmented display object, filtering the segmented display objects (501, 601) into high spatial frequency, HSF, components (502, 505, 508, 511, 603) and low spatial frequency, LSF, components (503, 506, 509, 512, 604); and applying a temporal modulation in the HSF components (502, 505, 508, 511, 603) of the segmented display objects (501, 601).