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0Why overconfidence can be good for you
Do you know anyone who is more confident in their own abilities than their actual performance suggests they should be? Perhaps they think they are an incredible singer, but they're actually tone-deaf.
Most people believe that they are more intelligent and skilful than the average person, according to a 2020 meta-analysis by Zell and colleagues. Obviously, this cannot be the case. Overconfidence has a cost – it can lead to things like poor financial decisions and dangerous driving. So why do we have such a tendency to overestimate our abilities?
Excessive self-belief requires self-deception – believing your own falsehoods. An evolutionary perspective argues that humans evolved self-deception so that we could deceive others more easily. The theory goes that if you believe your own lies about your abilities, you're less likely to display behaviours which will give it away, such as nervousness or hesitation.
Deceiving others about your abilities may enable you to open doors, but it is when you have to prove yourself that overconfidence can lead to costly mistakes. For those who have a greater underlying ability, though, overconfidence can be highly beneficial.
This is what researchers are calling the 'peacock's tail for people'. Peacocks have long and brightly coloured feathers to attract females, but they are extremely burdensome. The feathers are heavy and highly visible to predators, so only the healthiest peacocks can afford to carry such elaborate plumage. In other words, their feathers are a reliable indicator of their suitability for potential mates.
Authors of a 2026 study, published in the Psychological Review compare this phenomenon with human overconfidence. They argue that only the most capable people can keep a high self-belief without suffering severe consequences. In other words, overconfidence may actually be a useful signal of ability.
So, what lessons can be learnt from all this? If you have a high ability in a particular skill, make sure you have the confidence to match it. Ability can bring success, but remember, it is confidence which opens the doors in the first place.
词汇表
tone-deaf [ˈtəʊn def] adj. 音盲的，五音不全的
meta-analysis [ˈmetə əˌnæləsɪs] n. 元分析（对多项研究结果进行综合分析的统计方法）
overconfidence [ˌəʊvəˈkɒnfɪdəns] n. 过度自信，自负
overestimate [ˌəʊvərˈestɪmeɪt] vt. 高估，过高估计
self-belief [self bɪˈliːf] n. 自信，自我信念
self-deception [self dɪˈsepʃn] n. 自我欺骗
falsehood [ˈfɔːlshʊd] n. 虚假，谎言，谬误
give something away 泄露，暴露，露马脚
deceive [dɪˈsiːv] vt. 欺骗，蒙蔽
open doors 创造机会，获得机会，打开门路
underlying [ˌʌndəˈlaɪɪŋ] adj. 潜在的，根本的，基础的
peacock's tail for people [ˈpiːkɒks teɪl] 人类的孔雀尾巴（指用来展示自身优势的信号）
burdensome [ˈbɜːdnsəm] adj. 繁重的，累赘的，成为负担的
predator [ˈpredətə(r)] n. 捕食者，食肉动物
elaborate [ɪˈlæbərət] adj. 精心制作的，复杂精美的
plumage [ˈpluːmɪdʒ] n. 羽饰，羽毛，羽衣
indicator [ˈɪndɪkeɪtə(r)] n. 指标，指示物，标志
suitability [ˌsuːtəˈbɪləti] n. 合适，适宜，相配
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