Alexander Meiklejohn (2003). Legality Limitation of the Freedom of the Expression. Guiyang: Guizhou Renmin press.

And if an ATM also USES the keypads for entering other Numbers, such as the amount of money to withdraw, it contributes additional noise, says Meiklejohn.

'When someone influences you, it happens very quickly, in under a second,' says the lead researcher, Daniel Campbell-Meiklejohn of Aarhus University.