ABSTRACT
Perception is about the extraction of information from the external environment. It involves the operation of the senses and is effected in the shadow of the expectations, hopes, fears, needs and memories that make up our internal world. The great attraction of the visual system for attention research is that it is possible with suitable apparatus to discover what a person is looking at and where he moves his eyes to. How quickly visual information can be acquired depends on the position of the source of information in the visual field. There are two main classes of eye movements, those that involve the movement of the eyes so that the angle between the two lines of sight is constant and those when the angle changes. Scanpaths were also observed by P. J. Locher and C. Nodine whose subjects were directly instructed to memorize a series of random shapes while their eye movements were recorded.
