saccades. The lower the spatial frequency, meaning fewer objects in the visual field of the light flashes, the stronger the saccadic suppression. With fewer items in the visual field it is easier for saccadic suppression to occur. The higher the spatial frequency, which involves more complex objects within the visual field, the less likely there will be saccadic suppression. The second type concerns the detection of image displacement or a change in an image during eye movement. A displacement between saccades would not be detected because the movement of the eye eliminates the signal for the detection of the displacement. The location of the target forms an image feature that is used by the visual system to establish space constancy, which maintains the location of an object in space. Target blanking is used to study visual stability, space constancy and the content of information transferred across saccades. Blanking a target after a saccade eliminates an attempt to make a second saccade, resulting in the visual system failing to find the target information. Stability and constancy across the saccades is broken, as a result, image displacements become easier to detect when blanking occurs during or right after the saccade. Neural structures Superior colliculus A neural structure located behind the lateral geniculate nucleus that is understood to control eye movements. In particular, the deeper layers of the superior colliculus, known as lamina VI and VII, have been found to be involved in initiating and executing saccadic eye movements, which includes the desired speed and direction of the saccade. The cells in these layers are organized in a way that forms a map of the visual field. They are organized according to what direction each cell moves the eye. It has been found that activation of specific cells is directed by where objects in the environment are located in the visual field. Once a new object is detected, the cells that fire the strongest to stimuli within this specific area of the visual field will fire, causing the eyes to move and focus on this object. Although the superior colliculus may not be directly related to memory for objects across saccades, it is directly related to the control of saccades and selection of fixation targets. V4 This is an area within the visual cortex that has been found to play an important role in the target selection of saccades. In other words, this