跳蚤效應（Fleas Effect）是指跳蚤調節了自己跳的目標高度並適應了它，不再改變的現象。這個效應可以用來解釋人們在追求夢想或目標時所面臨的心理限制和自我設限。
跳蚤效應的來源可以追溯到一個跳蚤的實驗。在這個實驗中，一只跳蚤被放入一個玻璃杯中，它可以輕易地跳出來。然後，在玻璃杯上蓋上了一個盖子。結果，每次跳躍時，跳蚤都會撞到盖子。經過一段時間後，跳蚤開始根據盖子的高度調整自己的跳躍高度。最終，即使盖子被取下，跳蚤也無法再跳出玻璃杯。
這個實驗揭示了一個重要的心理現象。由於環境的變化，跳蚤調節了自己跳的目標高度並適應了它。然而，當機會再次出現時，它已經無法再跳出去了。這個現象在人類中也很常見。很多人在追求夢想或目標時，受到各種客觀因素的影響，例如他人的言論、困難、資源不足、缺乏機會等，導致他們降低了自己的目標，不再敢去追求夢想。當機會真正來臨時，他們認為自己無法抓住，並選擇放棄。這並不是因為他們無法實現，而是因為他們在心理上已經將自己限制在一個所謂的“高度”之內。
跳蚤效應提醒我們要警惕自我設限的心理現象。當我們對自己的能力和潛力設定了限制時，我們很可能無法充分發揮自己的潛力。因此，我們應該敢於追求成功，不要讓心理高度限制了我們的行動。只要我們有成功的野心，我們就能找到施展才華的舞台。
Fleas Effect
The Flea Effect refers to the phenomenon where fleas adjust and adapt their jumping target height, and no longer change it. This effect can be used to explain the psychological limitations and self-imposed restrictions that people face when pursuing their dreams or goals.
The origin of the Flea Effect can be traced back to an experiment with a flea. In the experiment, a flea was placed in a glass cup, which it could easily jump out of. Then, a lid was placed on the glass cup. As a result, the flea would hit the lid every time it jumped. After some time, the flea started adjusting its jumping height according to the height of the lid. Eventually, even when the lid was removed, the flea was unable to jump out of the glass cup.
This experiment reveals an important psychological phenomenon. Due to the changes in the environment, the flea adjusted and adapted its jumping target height. However, when the opportunity arose again, it was unable to jump out. This phenomenon is also very common in humans. Many people, when pursuing their dreams or goals, are influenced by various objective factors, such as the opinions of others, difficulties, lack of resources, and lack of opportunities, which cause them to lower their own goals and no longer dare to pursue their dreams. When the opportunity finally arrives, they feel they cannot grasp it and choose to give up. This is not because they cannot achieve it, but because they have already psychologically limited themselves to a so-called "height."
The Flea Effect reminds us to be wary of the phenomenon of self-imposed limitations. When we set limits on our own abilities and potential, we are likely unable to fully realize our potential. Therefore, we should dare to pursue success and not let our psychological heights restrict our actions. As long as we have the ambition to succeed, we can find a stage to showcase our talents.