Robots capable of social engagement help with loneliness as well as cognitive functioning, but the robot itself doesn't have to engage directly—it can serve as an intermediary for human communication.

能够参与社交的机器人可以帮助缓解孤独感并发挥认知功能，但机器人本身并不需要直接参与，它可以作为人类交流的中介。

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Researchers have found mounting evidence linking loneliness to physical illness and to functional and cognitive decline.

学者已经发现，越来越多的证据显示，孤独与生理疾病还有行为与认知能力下降都有关联。

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In fact, Age UK goes as far as arguing it is just as important as the physical activity bit as loneliness is a risk factor for both cognitive and physical decline.

BBC: Why old age need not be a burden