验证码（又称逆向图灵测试）似乎成为当前互联网用户注册、登录和执行某些操作的必要程序。尽管已有批评者指出验证码设计给特殊人群带来的识别和输入等障碍，当前却鲜有研究从技术哲学的角度解构这种验证机制的技术本体论。验证码技术展示了一类人机互动的关系倒转情境：计算机从作为“他者”的技术，摇身变为对人提问的考官，甚至开始界定和拷问人的本质，人则从“主体”蜕变为技术的“他者”。本文引入技术哲学和技术现象学相关理论，讨论逆向图灵测试如何介入并影响了人对于“人是什么”这一问题的回答与实践。文章分析了“我验故我在”人机互动隐含的身体观和能力主义（ableism）预设，以现实案例揭示逆向图灵测试的发展如何进一步将人制造为技术的“他者”，扩大了能力主义隐含的否定辩证法（negative dialectics），最后通过展示“缺陷”和“连接”的技术方案，讨论去能力主义（dis-ableism）的可能性。

CAPTCHA seems to be a necessary procedure for users’ registration, login, and conducting certain operations in current Internet environment. While critics have pointed out the barriers to identification and input that CAPTCHA design poses to special populations, extant studies rarely pay attention to the technological ontology of CAPTCHA and the relevant authentication mechanisms. CAPTCHA technology demonstrates a type of relational inversion of human-computer interaction: From being the technology of “the other”, the computer has transformed itself into an examiner who asks questions of the human being, and has even begun to define and interrogate the nature of the human being, while the human being has metamorphosed from a “subject” into the “other” of the technology. This article draws on the philosophy of technology and the phenomenology of technology to discuss how the Reverse Turing Test intervenes in and influences human answers and practices to the question of “what is a human being”. The article analyses the bodily and ableist presuppositions implicit in “I test, therefore I am” human-computer interactions, and uses real-life examples to reflect on the negative dialectics of ableism, which massively create human beings as technological “others”. It further rethinks the bodily view of human-computer interaction by proposing “defects” and “connections” to demonstrate the possibility of dis-ableism in CAPTCHA.