Accentuation Affects the Planning Scope and Focus-Accentuation Consistency Modulates Sentence Production: Evidence From Eye Movements.

Purpose: Previous studies have shown that the planning scope of sentence production is flexible and influenced by a range of linguistic and extralinguistic factors. However, one important aspect that remains underexplored is the role of prosody, a key component of language, in shaping the planning scope. While it has been established that both conceptual and grammatical information influence sentence production and conceptual information is closely linked with prosodic cues, it remains unclear whether and how prosody, particularly accentuation, affects the planning process. Additionally, there is limited understanding of how conceptual (focus) and prosodic (accentuation) information interact to influence sentence production. Therefore, this study aims to investigate whether prosody (specifically, sentence accentuation) influences the planning scope and how the interaction between conceptual focus and prosodic accentuation jointly shapes sentence production.

Method: Question-answer pairs were used to create focus, and a red dot was added in scenarios as a cue for accentuation. Participants were asked to complete a picture description task and accent the entity with a red dot. We manipulated the accentuation position (initial vs. medial) and focus-accentuation consistency (consistent vs. inconsistent).

Results: Speech latencies with initial accentuation were shorter than with medial accentuation. Eye-tracking data indicated that speakers preferred to fixate on accented pictures before articulation in initial accentuation, whereas in medial accentuation, speakers first preferred to fixate on deaccented pictures before shifting to accented ones. Both speech and first fixation latencies on accented pictures were shorter in the consistent condition. In the initial accentuation, accented-deaccented advantage scores were higher in the consistent condition from scenario onset to speech onset, while in the medial accentuation, this difference emerged after 220 ms. In addition, a focus inconsistent with the accentuation position slightly increases the acoustic prominence of deaccented information.

Conclusions: Accentuation positions affect planning scope, with a larger scope for medial accentuation. Additionally, the consistency between focus and accentuation influences sentence production, broadly affecting the processing of accented information and impacting external acoustic prominence. This influence on accented information processing occurs during the conceptualization and linguistic encoding phases, with processing starting more quickly and taking priority when focus and accentuation are consistent. This study provides a more comprehensive understanding of how various linguistic components interact to shape sentence production.

Supplemental Material: https://doi.org/10.23641/asha.28306436.