The world's first emotionally-powered store from Ebay showed us how the brain works while Christmas shopping

If the footage of this year's Black Friday chaos is anything to go by, shopping for gifts might be the most stressful thing about Christmas. Now, we have scientific evidence to support this.

Ebay has teamed up with US tech firm Lightwave to create the world's first "emotionally-powered store" in London, which uses facial coding technology to decide the Christmas presents you should buy for your loved ones.

According to Ebay, which used the same technology to study how the brain works while we shop for gifts, it can take just half an hour of online browsing to lose motivation.

To resolve this issue, the store - which launched on Tuesday December 1 and will run for two days - contains interactive screens which show customers range of gift ideas in a short space of time, at the same time measuring facial expressions and how long individuals spend looking at each gift to measure their emotional response.

Here's how it works.