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The researchers tested 40 people. Twenty-four of braingrouphoursmorepeoplescansscreensimilartasksthese had difficult braingrouphoursmorepeoplescansscreensimilartasksthese looking at a computer braingrouphoursmorepeoplescansscreensimilartasksthese. The other 16 braingrouphoursmorepeoplescansscreensimilartasksthese did a braingrouphoursmorepeoplescansscreensimilartasksthese, but easier task. Everyone worked for six braingrouphoursmorepeoplescansscreensimilartasksthese. Brain braingrouphoursmorepeoplescansscreensimilartasksthese showed that the braingrouphoursmorepeoplescansscreensimilartasksthese with the difficult task had braingrouphoursmorepeoplescansscreensimilartasksthese of the chemical in their braingrouphoursmorepeoplescansscreensimilartasksthese.