Page last updated at 17:17 GMT, Wednesday, 27 May 2009 18:17 UK

Can you hear the size of the dots?

We can all hear shapes and sizes as well as sounds, say Oxford University researchers. This phenomenon is known as synaesthesia - where stimulation of one sense causes another, secondary sensory experience.

In this clip, the sizes of the first two dots "match" the corresponding sounds, but the second two dots do not.

Some "synaesthetes" hear colours or see sounds very vividly. But, a new study has found that this secondary experience influences everyone's perception to a degree.

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