VIDEO: Why a smile could change this advert

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    Will our emotions change the way adverts work?

    24 July 2015 Last updated at 13:07 BST

    A bus stop poster which evolved over time depending on how people responded to it has recently been tested in London.

    It is part of a wider area of research into how our emotional responses and biometric data could teach advertisers how to target people according to their mood.

    BBC Click’s Dan Simmons reports.

    More at BBC.com/Click and @BBCClick.