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美国哈佛大学利萨·伯克曼博士的研究小组,用6年时间跟踪了1 6638名40～80岁的美国人。以回忆一个写有10个单词的表格等方式评估他们的记忆力,并调查他们参加志愿者活动的频率,以及对邻居、同事的了解程度等,以评估其社交活动情况。
In a six-year period, the research team of Dr. Lisa Burkman, Harvard University, has tracked 16,638 Americans aged 40 to 80. Evaluate their memory by recalling a 10-word form, assess their frequency of participation in volunteer activities, and their level of familiarity with their neighbors and colleagues to assess their social activities.