... more about visual perception and hence what visual illusions can tell us about information processing, it is first worth noting the way in which the visual system is constructed. Below is a very brief and over-simplified outline of the processes involved. The cornea bends incoming light rays from the visual stimulus so they fall directly onto the retina at the back of the eyeball. The retina is a layer of light receptors (photoreceptors) and nerve cells at the rear of the eye and it is here that the transduction of light into neural energy takes place. The retina contains two types of photoreceptors: rods and cones, and a variety of nerve cells. Cones provide our perception in daylight conditions and allow us to see colour. Rods enable us to see under dim conditions (although they only allow black and white perception). The photoreceptor cells convert light into neural information, which is ...

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