Time (also) flies from left to right.

Everyday linguistic expressions in many languages suggest that back and front space is projected onto temporal concepts of past and future (as in the sentence we are years ahead of them). The present experiment tested the psychological reality of a different space-time conceptual metaphor--projecting the past to left space and the future to right space--for which there are no linguistic traces in any language. Participants categorized words as referring to the past or to the future. Irrelevant to this task, words appeared either to the left or right of the screen, and responses were given by keypresses of the left or right hand. Judgments were facilitated when word position and response mapping were congruent with the left-past right-future conceptual metaphor. These results are discussed in the context of current claims about the embodiment of meaning and the possible mechanisms by which conceptual metaphors can be acquired.