参考答案

正确答案：decision processes
decision processes 解析：空前的the表明，本空应填名词(短语)。该段首句后半部分提到，我们还会测试一下他们决策过程中的信心，末句提到测试结果：80%到90%的人说他们相信自己会注意到有些事情不对劲。题干中的most people是对between 80 and 90 per cent of people的概括总结，are quite confident about是对that they believed they would have noticed something was wrong的概括总结，their feelings in与their beliefs about对应，故about后的decision processes即为本题答案。