詹森效應是指一種心理現象，源於一位名叫丹·詹森（Dan Jansen）的運動員。詹森在平時訓練有素，實力雄厚，但在體育賽場上卻連連失利。這種現象被稱為詹森效應，意味著一個人在平時表現良好，但由於缺乏應有的心理素質而導致競技場上失敗。
詹森效應是一種心理疾病，表現為將現有的困境無限放大的心理異常現象。在日常生活中，有些名列前茅的學生在高考中屢屢失利，有些實力相當強的運動員卻在賽場上發揮異常，饮恨敗北等等。這種現象的唯一解釋是心理素質問題，主要原因是得失心過重和自信心不足。
心理學家埃里希·福洛姆曾進行了一個實驗，他帶領學生們走過一座非常窄小的木橋，並告訴他們橋下有各種毒蛇。學生們在看到毒蛇後，即使有安全網的保護，也不敢再次走過這座橋。這個實驗說明了心態的重要性，如果心態混亂，即使事情再簡單，也會讓人不敢嘗試或不願意全力以赴。
要克服詹森效應，首先需要認清競技場的目的，克服恐懼感，明白競技場只是比平常正規一些而已。其次，要平心靜氣地走出狹隘的患得患失的陰影，不貪求成功，只求正常地發揮自己的水平。最重要的是要树立自信心，相信自己的能力，才能發揮應有的水平。
The Jensen Effect
The Jensen Effect refers to a psychological phenomenon named after the athlete Dan Jansen. Jansen was well-trained and highly capable, but he repeatedly failed on the sports field. This phenomenon is known as the Jensen Effect, meaning that a person who performs well in normal circumstances fails to deliver due to a lack of appropriate mental qualities.
The Jensen Effect is a psychological condition characterized by the tendency to excessively magnify existing difficulties. In daily life, some top students repeatedly fail in the college entrance exam, and some athletes with considerable strength perform abnormally and suffer bitter defeats on the field. The only explanation for this phenomenon is a problem with psychological qualities, mainly due to an excessive focus on success and failure and a lack of self-confidence.
Psychologist Erich Fromm conducted an experiment where he led students across a very narrow wooden bridge and told them that there were venomous snakes below. After seeing the snakes, the students were too afraid to cross the bridge again, even with a safety net. This experiment demonstrates the importance of mental state - if one's mindset is in disarray, even simple tasks can become daunting and people may be unwilling to make a full effort.
To overcome the Jensen Effect, one must first recognize the purpose of the competitive field, overcome the sense of fear, and understand that the competitive arena is only slightly more formal than normal. Secondly, one must calmly emerge from the narrow shadow of success and failure, not craving success, but simply aiming to perform at one's normal level. Most importantly, one must establish self-confidence, believe in one's own abilities, and then be able to fully display one's true potential.