Others have pointed out limitations with the bracelets, including that they are not able to tell whether a student was responding to their teacher or something a friend whispers in their ear.

The bracelets are also so far unable to distinguish whether a heightened response is due to excitement or anxiety, and whether a drop in response is due to relaxation or boredom.

The amount Bill Gates has spent on evaluating the bracelets is already more than $1.1 million.

Clemson University has been given almost $500,000 (£320,000) to run a pilot study ‘which will determine the feasibility and utility of using such devices regularly in schools with students and teachers.’

The National Center on Time and Learning was given more than $620,000 ($400,000) to assess the effectiveness of the bracelets by comparing them with MRI scans, and work out a scale that would pinpoint how engaged a student was in lessons.

微软创始人比尔-盖茨正研制一款适用于学生的“情绪手镯”，来检测他们对上课内容有多感兴趣。

比尔及梅琳达•盖茨基金会将花费110万美元（合70万英镑）测试皮肤电反应手镯，看其是否能够衡量出学生对授课内容的兴趣。

这是盖茨评估并改进教师素质的项目的一部分，该项目还包括一些具有争议的举措，比如在课堂里安装摄像机。

这种手镯可以测试出皮肤导电的能力，而这种导电能力在不同湿度下会有变化。

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