Martin was a healthy and active 41 year old male who suddenly developed problems with simple, everyday motor tasks such as taking a walk. The severity of these problems seemed to fluctuate, but when he also started to experience repeated strong headaches centred at the back of his head, he decided to see a specialist. Martin went to a hospital where several tests were run in order to determine the nature of his problem. These tests showed that in addition to his headaches and difficulties walking, Martin had developed a range of cognitive, perceptual and motor problems. Some of these included an inability to carry out simple mathematical calculations involving addition and subtraction, and difficulties performing tasks such as verbally identifying which finger was being touched by the physician (digital agnosia). In addition, it appeared Martin had poor motor control on the right side of his body. After conducting these behavioural tests, doctors decided to scan Martin’s brain using magnetic resonance imaging (MRI). MRI scanning provides a detailed three-dimensional photograph of the brain from which structural problems can often be identified. Photographs of Martin’s brain showed that he had suffered a stroke. The stroke had caused bilateral damage to the posterior part of Martin’s brain, particularly around the border between the parietal and occipital lobes. The most extensive damage wa
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