ABSTRACT
The human eye takes in ten million bits of information per second but only deals consciously with forty. The human visual system then divides the continuous pattern of light projected onto the retina into a discrete set of separate objects. This visual information is then analysed in yet other areas of the brain, which themselves are linked to many parts of the body. Binocular rivalry occurs when two images are presented simultaneously, one to each eye. These two images appear to alternate unpredictably as opposed to forming a third, stable image. Blindsight occurs due to damage of the primary visual cortex, resulting in a scotoma, or region of blindness. People with a scotoma report no visual awareness of visual stimuli presented to them in their blind field. Persaud and colleagues tested a patient with blindsight who was correct 70% of the time when asked to decide whether a stimulus had been presented to his affected visual field.