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Close your eyes and conjure a memory. Select a special place from your past: the view from a hotel room, or through a lych gate, or across a valley. Visualise the image in your mind.
On the right side of your brain, neurons are firing in your frontal lobe: monitoring, sequencing and organising. Remote regions of your brain are working in parallel. Chemical reactions and electrical charges travel through neuronal circuits and across synapses, reaching the temporal lobe at the side of your head, meeting signals from the hippocampal system below.
Memory is the "most fundamental and elusive of human powers", writes Frances Yates in her book The Art of Memory. Now imagine that it all stops. Imagine amnesia.
The sun on a coastal road. Stopping to repair a puncture in the early morning light. It's 5 July 1994. The next memory that Peter Wheeler can be certain about is six weeks later. He is being driven to his parents' house near Solihull in the West Midlands and he is reciting the street names. He was a postman, and the names still come easily. He desperately needs to prove to himself that his brain is still working.
In the five years since he came off his bicycle near Bishopsbourne, south of Canterbury, fracturing his skull in three places, Peter has devoted himself to putting his past back together. Like all amnesiacs who have suffered a head injury, he will never be able to recall the accident. He has no idea how he came off his touring bike so suddenly. Police who examined the scene found no evidence of a collision or holes in the road and so the accident will always be a mystery, but Peter is determined that the rest of his life won't stay that way.
When he eventually returned to his own flat, Peter couldn't remember it, or the accumulated stuff of ordinary life: the photographs, records and books. He sat and listened to all his music, record by record, to find out what he liked - jazz and reggae - and he finally realised that the picture on the wall of his spare room was of Bob Marley.
Hung on the walls of his living room are photographs of mountain views in clip frames, mountains he has walked up. When he first saw them he couldn't remember their names and he couldn't remember being on them. It drove him to despair. For weeks he pored over maps spread across the carpet of his mother's home, cross-referencing the routes marked on them against diary entries and photo albums, talking for hours with his brother about their walking holidays together.
His memories of the weeks following the accident are still cloudy, and he still prefixes most statements about the past with, "It's all very vague." He can't remember much of his childhood: a vivid memory of being caned for smoking at school, and of going to buy his first bicycle with his dad. But the memories of his adulthood have filtered back week by week, day-by-day. They are hard-earned.
Very little is known about how the brain recovers from a head injury. Most of the improvements seem to take place in the first year, as the bruising goes down. Retrograde amnesia, the name psychologists give to the loss of memories formed prior to the illness, can gradually shrink, sometimes right up to the hour before the accident. The parts of the brain needed to store long-term memories start working again with varying degrees of efficiency. Some psychologists believe that the brain compensates by forming new pathways, but there is no solid evidence.
Relationships have proved to be one of the worst problems for Peter. A few days after he left hospital, his brother Paul took him into The Navigation, his local in the village of Lapworth, near Solihull. Although Paul had warned them, old friends took offence when Peter didn't recognise them. Months later he saw a woman drive by and smile at him. He turned to his mother and said, "I think that's my girlfriend." The woman had heard about his injuries and didn't come round anymore...
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