神经科学与心理学2020nature.com
电视观看与老年认知衰退
Television viewing and cognitive decline in older age
入门 · 约 45 分钟读完前置知识：流行病学基础、相关性分析
导读
这篇论文研究了老年人看电视时间与认知衰退之间的关系，发现重度看电视者的言语记忆等认知指标下降更快。评论普遍质疑其中的因果关系：看电视可能只是久坐、缺乏社交等生活方式的伴随现象。
HN 关注点：观察性研究中的因果推断问题，以及被动消费媒体（电视 vs 网络内容）对大脑的影响。
HN 评论精选
这几条评论里：质疑 2 补充 1 亲历 1
质疑看电视与认知衰退的相关性可能源于伴随的生活方式差异，因果关系很弱
这就像说“红酒对心脏好”一样。有一项研究分析了超过三百万张购物小票，发现买红酒的人更倾向于同时购买橄榄、低脂奶酪、蔬果、低脂肉类和茶，而买啤酒的人则更多买薯片、番茄酱、人造黄油、糖、即食餐和软饮料。我想说的是：看电视确实让大脑的思考部分“关机”，但与此同时你也不运动了。这里的因果关系非常不可靠。
papito查看英文原文
It's like when they say "wine is good for your heart". And then a study analyzed over three million grocery receipts.. "The people who bought wine were more likely to place olives, low-fat cheese, fruits and vegetables, low-fat meat, spices, and tea in their carts. Beer drinkers, on the other hand, were more likely to reach for the chips, ketchup, margarine, sugar, ready-cooked meals, and soft drinks." Schatzker, Mark. The Dorito Effect: The Surprising New Truth About Food and Flavor (p. 155). Simon & Schuster. Kindle Edition. EDIT: What I am saying is - yes, television shuts off the thinking part of your brain, but then you also don't move, don't exercise. Causation here is VERY flaky.
质疑测试的言语记忆能力与看电视所需能力无关，测量方式值得怀疑
研究中测量的是即时和延迟言语记忆：受试者听录音每 2 秒念一个常见词，共 10 个，然后要求立即和短暂延迟后回忆。这正是重度看电视者下降的指标，而看电视本身并不需要这种能力，因为理解下一段视频很少需要回忆之前听到的话。我自己做这类任务也不擅长，看过的电视节目事后什么都不记得，这也许是大脑保护记忆不被无意义内容覆盖的一种方式。
Merrill查看英文原文
>Immediate and delayed verbal verbal memory were assessed using a word learning task in which participants were presented with 10 common words by a taped voice, one every 2 seconds. Participants had to recall as many words as possible immediately and after a short delay during which they completed other cognitive tests. This is the measure that declined in heavy television watchers. It is also a task that television watching doesn't require, since recall of previous spoken words is rarely needed to understand the next video sequence. It's also a task that I don't do well on. I do much better if the words are presented in writing. I can watch a TV show and not remember a thing about it later. It may be a way the brain has of protecting memory from being overwritten by nonsense.
补充质疑看电视与刷网页等被动内容消费在认知影响上是否真有区别
有什么理由认为看电视和在网上被动消费文字内容有区别吗？我以前觉得有，但现在不太确定了。为娱乐而设计的被动媒体消费，无论是视觉还是文字形式，似乎都太相似了。
copperx查看英文原文
Is there a reason to believe that there's a difference between TV viewing and passive textual content consumption on the web? I used to think so, but nowadays I'm not so sure. Passive consumption of media designed to entertain, be it visual or textual, seems too similar.
亲历真正原因可能是老年人缺乏社交，而非看电视本身
我认识很多这样的老年人，我认为真正的问题是他们社交不足，这才是认知衰退和偏执的根源。有些人搬到更便宜的退休地后没有多少朋友，但大多数人只是看电视而不打电话约朋友，尽管朋友也很想见面。我尝试劝说过但没有成功。
uberduber查看英文原文
I know a ton of these older adults. I think the true problem is that they are not socializing enough which is the cause of the mental decline and often paranoia. Some of them have moved somewhere cheaper to retire where they don’t have many friends, but most of the ones I know just watch tv instead of calling a friend to do something. The friend is the same even though they would love to hang out. I’ve tried nudging them with no success.
历次讨论
- 2020Hacker News 讨论帖289 分 · 142 评
同领域还值得读
神经科学家能理解微处理器吗？（2017）
Could a Neuroscientist Understand a Microprocessor? (2017)
提出一个思想实验：把神经科学常用的分析方法（损伤实验、电生理、功能定位等）应用到一个我们完全了解其原理的工程系统——6502 微处理器（运行游戏）上，检验这些方法能否真正“理解”…
神经科学与心理学2017 · 411 分 · 135 评进阶 · 约 60 分钟编辑精选大脑衰老呈现非线性转变，提示中年“关键窗口”
Brain aging shows nonlinear transitions, suggesting a midlife "critical window"
这篇 PNAS 论文研究大脑衰老的非线性变化，发现大脑老化并非匀速进行，而是在中年（约 40-60 岁）存在一个关键的"临界窗口期"，此时干预可能有效。
神经科学与心理学2025 · 295 分 · 159 评进阶 · 约 75 分钟编辑精选社交网络中大规模情绪传染的证据（2014）
Evidence of massive-scale emotional contagion through social networks (2014)
这篇 2014 年发表于 PNAS 的论文研究了 Facebook 上约 70 万用户的信息流中，减少正面或负面内容是否会传染性地影响用户自己发布内容的情绪。
神经科学与心理学2020 · 285 分 · 72 评入门 · 约 45 分钟编辑精选裸盖菇素使人类大脑去同步化
Psilocybin desynchronizes the human brain
这篇 Nature 研究用个体化的 fMRI 精密成像追踪受试者服用裸盖菇素（psilocybin）前后的脑功能连接变化，发现药物会造成大范围的脑网络「去同步化」，尤其是默认模式…
神经科学与心理学2024 · 273 分 · 259 评进阶 · 约 60 分钟编辑精选对智力的赞扬会削弱儿童的动机与表现（1998）
Praise for Intelligence Can Undermine Children's Motivation (1998)
这篇 1998 年的经典论文（Dweck 等人）通过实验研究表扬方式对儿童动机的影响：夸孩子“聪明”（表扬智力）会让他们回避挑战、害怕失败，而表扬努力则更能培养坚持性。
神经科学与心理学2016 · 253 分 · 155 评入门 · 约 45 分钟编辑精选