According to a theoretical tradition dating back to Aristotle, verbs can be classified into two broad categories. Telic verbs
(e.g., "decide," "sell," "die") encode a logical endpoint, whereas atelic verbs (e.g., "think," "negotiate," "run") do not,
and the denoted event could therefore logically continue indefinitely. Here we show that sign languages encode telicity in
a seemingly universal way and moreover that even nonsigners lacking any prior experience with sign language understand these
encodings. In experiments 1-5, nonsigning English speakers accurately distinguished between telic (e.g., "decide") and atelic
(e.g., "think") signs from (the historically unrelated) Italian Sign Language, Sign Language of the Netherlands, and Turkish
Sign Language. These results were not due to participants’ inferring that the sign merely imitated the action in question.
In experiment 6, we used pseudosigns to show that the presence of a salient visual boundary at the end of a gesture was sufficient
to elicit telic interpretations, whereas repeated movement without salient boundaries elicited atelic interpretations. Experiments
7-10 confirmed that these visual cues were used by all of the sign languages studied here. Together, these results suggest
that signers and nonsigners share universally accessible notions of telicity as well as universally accessible "mapping biases"
between telicity and visual form.