The interaction of syntax, non-manuals, and prosodic cues as potential topic markers in Austrian Sign Language

Topic is often marked only by prosody across languages. In sign languages, prosody is expressed by features similar to those in speech: i.e., sign duration, velocity and amplitude of movement (cf. slope and range of pitch). Topicalized signs usually occur sentence-initially, are followed by a pause, and may show longer duration than nontopics. We used pausing and duration characteristics to resolve a puzzle concerning the status of OSV sentences in Austrian Sign Language (ÖGS): are they a nonmanually unmarked variant of non-manually marked topic sentences (O,SV), or are they a within-clause variant of the basic SOV order serving an as-yet-unknown discourse function? We investigated the temporal parameters of prosodic cues of 160 sentences produced by a fluent ÖGS signer: 40 in each of four conditions — SOV, OSV, S,OV, and O,SV. Overt topic marking effects on signing dynamics consisted of (1) lengthening of the sentence-initial topic phrases, causing a delay of the onset of the argument following the topic-marked item, and (2) a shortened duration of the noun phrase following the topic-marked item. Critically, the initial argument of OSV sentences did not show these prosodic cues, indicating that the initial argument O is not treated as being the same kind of topic as in the non-manually marked O,SV sentences. In accordance with the previous literature on pausing and lack thereof, we suggest that OSV might be akin to spoken German scrambling (within-clause movement), although the function performed remains to be investigated. The findings characterize parameters of temporal structure in the physical markers of topic in ÖGS and point to cross-linguistic variability in prosodic marking for topicalized structures.