Spanish but not French uses accent to contrast between words (e.g., tópo vs topó). Two populations of subjects were tested on the same materials to determine whether this difference has an impact on the perceptual capacities of listeners. In Experiment 1, using an ABX paradigm, we found that French subjects had significantly more difficulties than Spanish subjects to perform an ABX classification task based on accent. In Experiment 2, we found that Spanish subjects were unable to ignore irrelevant differences in accent in a phoneme-based ABX task, whereas French subjects had no difficulty at all. In Experiment 3, we replicated the basic French finding, and found that Spanish subjects benefited from redundant accent information even when phonemic information alone was sufficient to perform the task. In our final experiment, we showed that French subjects can be made to respond to the acoustic correlates of accent; therefore their difficulty in Experiment 1 seem to be located at the level of short-term memory. The implications of these findings for language-specific processing and acquisition are discussed.The native speaker's difficulties with some nonnative segmental contrasts is well documented, (e.g., Polka & Werker, 1994). Much less is known about the way in which rhythmical and structural properties of the native language affect encoding of foreign words. This study reports four experiments to assess the claim that nonsegmental properties of the native language greatly affect the way in which unfamiliar items are processed and represented.Learning a language requires, inter alia, acquiring knowledge of the language's sound pattern. Psycholinguists have mostly assumed that learning the sound pattern of a native language essentially involves learning the segments of the language. This assumption is evident in books and articles on the subject, e.g., Carroll (1960) for an early formulation of this view and Miller and Jusczyk (1990) for a later one. There is no question that segments are an essential ingredient of the sound pattern of language though many other properties of speech are also important. Foreign accents reflect segmental difficulties but also supra-segmental ones. For instance, informal observations suggest that French speakers who acThis research was supported by grants from the Human Frontier Science Program, the Human Capital program, the FrancoSpanish Exchange Program for 1993-1995, the Fyssen Foundation and DRET. We thank Jennifer Glos, Xavier Hardy and Olivier Crouzet for help in stimulus construction and data gathering. We thank Stanislas Dehaene and Brit van Ooijen for very useful comments on earlier versions of this paper. Mailing address: Emmanuel Dupoux, 54 Bd Raspail, F-75270 Paris Cedex 06, France. http://www.ehess.fr/centres/lscp/persons/dupoux quire English after puberty produce segments that are not prototypical of English, and prosodic output is usually deficient as well. It is not uncommon to hear speakers of French who fail to reduce vowels or who make the wrong vowel prominent. ...