Functional roles of Swedish pitch accents and their phonological and cognitive markedness

In Swedish, words are associated with either of two pitch contours labelled as Accent 1 and Accent 2. At least one of them is taken to be phonologically and cognitively marked. Besides encoding lexical tonal distinctions, these accents reflect intonational prominence. Drawing on data from psychometric and electroencephalographic (EEG) measures, we scrutinized the functional load of the accents for the processing of linguistic input, and explored any potential processing differences between Accent 1 and Accent 2. Experimental stimuli consisted of one hundred sets of auditory dialogues, where test words were accented either appropriately or inappropriately within their respective contexts. Native speakers of Central Swedish were tasked with judging the correctness of sentences containing the test words, actively in the psychometric paradigm and passively in the EEG paradigm. Psychometric data from forty participants revealed that accent violations exerted a statistically significant negative impact on correctness judgements. Both Accent 1 and Accent 2 violations were deemed as incorrect by the listeners, indicating that listeners use both of them to arrive at the correct interpretation of the linguistic input. Moreover, there was a statistically significant difference in the perceived correctness of violations depending on the accent pattern. Accent 2 violations received a lower rating for correctness in comparison to Accent 1 violations, suggesting that listeners show more sensitivity to accent violations in Accent 2 words than in Accent 1 words. EEG data from twenty participants were in accordance with the psychometric data, and documented larger negative ERP responses, observed at both early and later latencies, to Accent 2 violations compared to Accent 1 violations, reflecting neurocognitive difficulty associated with the processing of linguistic input. Put differently, the application of wrong accent pattern for Accent 2 words resulted in higher costs for spoken communication than Accent 1 words, which is in line with the notion that Accent 2 is marked both phonologically and cognitively in Central Swedish. This pattern of results provides evidence that the brain not only extracts and utilizes pitch accents for a coherent interpretation of the linguistic input but also treats them differently depending on their phonological and cognitive markedness.