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Description: Using space-time interaction as the testing case, we investigated whether cross-dimensions magnitude interactions reflect people’s experience of statistical correlation among concurrent magnitude dimensions. Space and time were manipulated to be correlated positively or negatively (i.e. participants reproduced length by holding down a key to grow or shrink a line over time). Under positive space-time correlation, reproduced duration increased as a function of a concurrent length and length reproduction was not sensitive to the concurrent duration; under negative space-time correlation, the time-on-space effect was attenuated and length reproduction decreased as a function of the concurrent duration. These findings suggest that cross-dimensional magnitude interactions reflect people’s prior belief/knowledge of cross-dimensional correlation, which itself tunes to recent input.