A computerised brain-training program cut the risk of dementia among healthy people by 48% , US researchers said after a 10-year study. The preliminary findings, presented at the Alzheimer's Association International Conference in Toronto, are the first to show that any kind of intervention could delay the development of dementia in normal, healthy adults.To date, cognitive psychologists and neuroscientists have largely rejected evidence that "brain games" have any effect on cognitive function.The new findings would be quite promising if they held up through peer review and publication in a scientific journal, said John King, an expert in social research at the National Institute of Ageing.The research found that a group of volunteers who participated in speed-training exercises showed less risk of dementia relative to the control group. ..