EVA:Eye Tracking Stimulus Integrated Semi Automated Case Base System.

In a real world visual search is a common task depending from sensory, perceptual and cognitive processes. Different classes of eye movements are necessary to hold an image on the retina during head rotation or movement of the image, and to move the eye suddenly to a new point of interest in space. From a functional point of view, two major classes of eye movements are described in humans: those stabilizing gaze (optokinetic nystagmus, oculovestibular reflex) and those moving gaze (saccades, pursuits and vergence). Under natural conditions, however, a mix of all kinds of eye movements permit continuous scanning of the visual scene. The sequence of fixations and saccades during visual exploration is an expression of a number of cognitive processes; the use of standardized tasks with pre-defined spatial-temporal variables allows us to assess specific cognitive domains, such as perception, attention, memory, preference and motivation. Manipulating the search task can vary the demands on brain. In turn, brain modulates visual search by selecting and limiting the information available at various levels of processing. The EVA software is a complete system based on a set of stimulus and patient’s case able to stress brain functionalities in order to assess some cognitive functions.