Cadbury had previously won a trademark case which would have allowed it to produce Kit-Kat-shaped products.

BBC: Quiz of the week's news

An activity spike in the left prefrontal cortex--an "approach" response to the image of a Kit Kat chocolate bar--would suggest the subject is attracted to the brand image or message.

FORBES: In Search of the Buy Button

Kit Kat is one of Nestle's top-selling brands, with 150 bars consumed worldwide every second.

BBC: Recalled products