The real reason people close their eyes when they kiss is because the brain can't deal with more than two things at once.
That is the finding of academics who have explored one of the great mysteries of the human psyche. When people pucker up the brain finds it difficult to process the sensation if cognitive power is also being used to analyse what we see, said psychologists from Royal Holloway, University of London.
'Tactile awareness depends on the level of perceptual load in a concurrent visual task,' said Polly Dalton and Sandra Murphy, from the university, in the Journal of Experimental Psychology: Human Perception and Performance
Instead people were asked do visual tests while their response to something touching their hands was measured.
The academics found that the visual field overrides tactile responses - meaning people would struggle to continue kissing if what they were looking at became more difficult to process.
Dr Dalton told The Sunday Times: 'If we are focusing strongly on a visual task, this will reduce our awareness of stimuli in other senses.
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