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Association of social contact with dementia and cognition: 28-year follow-up of the Whitehall II cohort study.
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环境富集(EE)的定义是通过更大的群体住房、额外的物体以及通常的跑步轮，在动物的环境中添加社会、身体和体感刺激。
终身情感表达可以防止与年龄相关的大脑结构和功能的改变。我们已经报道，6周的这种富集足以改善大鼠的记忆并诱导神经发生(Birchetal.，2013)。本文使用的正常衰老的纵向模型通过跟踪从青年到中年和老年随年龄的变化，增强了分析的能力
在由于虚弱或身体残疾的原因，没有表明运动的人群中，EE在没有运动的情况下潜在的认知益处特别相关。这项研究提供了明确的证据，表明认知刺激可以防止一系列认知功能的年龄相关下降，同时伴随大脑结构和海马血流的大体解剖变化。EE诱导生长因子的表达，同时增加细胞增殖，抑制细胞凋亡和炎症，表明这种独立于物理活动的保护作用的潜在细胞机制。
社会纽带、社会网络、有意义的社会接触、知己的可获得性、
情感 信息 评价 物质
情绪与主观感知更重要
结构---主效应模型
功能---buffer
有没有把家庭和朋友分开研究的？
家庭的社会支持是否在压力环境（负面事件）更能发挥作用？