Our motor actions normally generate sensory events, but how do we know which events were self generated and which have external causes? Here we show that adaptation to artificially-induced delays between action and event can produce a startling percept - upon removal of the delay it feels as if the sensory event precedes the action which was intended to cause it (Stetson et al. 2006). This temporal recalibration of action and event occurs in a quantitatively similar manner across the sensory modalities. Critically, it is robust to the replacement of one sense during the adaptation phase with another sense during the test judgment. This suggests a high-level, supramodal recalibration mechanism. The effects are well described by a simple Bayesian model which incorporates a prior expectation of synchrony between action and event – an expectation which is challenged during adaptation to induced sensorimotor delays. We further demonstrate that our model may have relevance for temporal adaptation data outside the sensorimotor domain. Recent findings from (purely sensory) audiovisual adaptation experiments (Fujisaki et al. 2004) are well described by the a modified version of the model where signals are recalibrated by an assumption of synchrony that is weaker than it's sensorimotor counterpart but tuned over a similar temporal range.