@article{ClahsenJessen2019,
  author    = {Clahsen, Harald and Jessen, Anna},
  title     = {Do bilingual children lag behind? A study of morphological encoding using ERPs},
  series = {Journal of child language},
  volume    = {46},
  journal   = {Journal of child language},
  number    = {5},
  publisher = {Cambridge Univ. Press},
  address   = {New York},
  issn      = {0305-0009},
  doi       = {10.1017/S0305000919000321},
  pages     = {955 -- 979},
  year      = {2019},
  abstract  = {The current study investigates how bilingual children encode and produce morphologically complex words. We employed a silent-production-plus-delayed-vocalization paradigm in which event-related brain potentials (ERPs) were recorded during silent encoding of inflected words which were subsequently cued to be overtly produced. The bilingual children's spoken responses and their ERPs were compared to previous datasets from monolingual children on the same task. We found an enhanced negativity for regular relative to irregular forms during silent production in both bilingual children's languages, replicating the ERP effect previously obtained from monolingual children. Nevertheless, the bilingual children produced more morphological errors (viz. over-regularizations) than monolingual children. We conclude that mechanisms of morphological encoding (as measured by ERPs) are parallel for bilingual and monolingual children, and that the increased over-regularization rates are due to their reduced exposure to each of the two languages (relative to monolingual children).},
  language  = {en}
}
@article{ClahsenJessen2021,
  author    = {Clahsen, Harald and Jessen, Anna},
  title     = {Morphological generalization in bilingual language production},
  series = {Language acquisition : a journal of developmental linguistics},
  volume    = {28},
  journal   = {Language acquisition : a journal of developmental linguistics},
  number    = {4},
  publisher = {Psychology Press, Taylor \& Francis Group},
  address   = {London},
  issn      = {1048-9223},
  doi       = {10.1080/10489223.2021.1910267},
  pages     = {370 -- 386},
  year      = {2021},
  abstract  = {Morphological variability in bilingual language production is widely attested. Producing inflected words has been found to be less reliable and consistent in bilinguals than in first-language (functionally monolingual) L1 speakers, even for bilingual speakers at advanced proficiency levels. The sources for these differences are not well understood. The current study presents a detailed investigation of morphological generalization processes in bilingual speakers' language production. We examined past participle formation of German using an elicited-production experiment containing nonce verbs with varying degrees of similarity to existing verbs testing a large group of bilingual Turkish/German speakers relative to L1 German speakers. We compared similarity-based lexical extensions with generalizations of morphological rules. The results show that rule-based generalizations are used less often and more variably within the bilingual group than within the L1 group. Our results also show a selective effect of age of acquisition on the bilingual speakers' morphological generalizations.},
  language  = {en}
}
@misc{ClahsenJessen2019,
  author    = {Clahsen, Harald and Jessen, Anna},
  title     = {Do bilingual children lag behind?},
  series = {Postprints der Universit{\"a}t Potsdam : Humanwissenschaftliche Reihe},
  journal   = {Postprints der Universit{\"a}t Potsdam : Humanwissenschaftliche Reihe},
  number    = {682},
  issn      = {1866-8364},
  doi       = {10.25932/publishup-46972},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-469727},
  pages     = {27},
  year      = {2019},
  abstract  = {The current study investigates how bilingual children encode and produce morphologically complex words. We employed a silent-production-plus-delayed-vocalization paradigm in which event-related brain potentials (ERPs) were recorded during silent encoding of inflected words which were subsequently cued to be overtly produced. The bilingual children's spoken responses and their ERPs were compared to previous datasets from monolingual children on the same task. We found an enhanced negativity for regular relative to irregular forms during silent production in both bilingual children's languages, replicating the ERP effect previously obtained from monolingual children. Nevertheless, the bilingual children produced more morphological errors (viz. over-regularizations) than monolingual children. We conclude that mechanisms of morphological encoding (as measured by ERPs) are parallel for bilingual and monolingual children, and that the increased over-regularization rates are due to their reduced exposure to each of the two languages (relative to monolingual children).},
  language  = {en}
}
@article{JessenFleischhauerClahsen2017,
  author    = {Jessen, Anna and Fleischhauer, Elisabeth and Clahsen, Harald},
  title     = {Morphological encoding in German children's language production},
  series = {Journal of child language},
  volume    = {44},
  journal   = {Journal of child language},
  publisher = {Cambridge Univ. Press},
  address   = {New York},
  issn      = {0305-0009},
  doi       = {10.1017/S0305000916000118},
  pages     = {427 -- 456},
  year      = {2017},
  abstract  = {This study reports developmental changes in morphological encoding across late childhood. We examined event-related brain potentials (ERPs) during the silent production of regularly vs. irregularly inflected verb forms (viz. -t vs. -n participles of German) in groups of eight- to ten-year-olds, eleven- to thirteen-year-olds, and adults. The adult data revealed an enhanced (right-frontal) negativity 300-450 ms after cue onset for the (silent) production of -t relative to -n past participle forms (e.g. geplant vs. gehauen 'planned' vs. 'hit'). For the eleven- to thirteen-year-olds, the same enhanced negativity was found, with a more posterior distribution and a longer duration (=300-550 ms). The eight- to ten-year-olds also showed this negativity, again with a posterior distribution, but with a considerably delayed onset (800-1,000 ms). We suggest that this negativity reflects combinatorial processing required for producing -t participles in both children and adults and that the spatial and temporal modulations of this ERP effect across the three participant groups are due to developmental changes of the brain networks involved in processing morphologically complex words.},
  language  = {en}
}
@article{JessenVerissimoClahsen2019,
  author    = {Jessen, Anna and Verissimo, Jo{\~a}o Marques and Clahsen, Harald},
  title     = {Variability and consistency in late bilinguals' morphology},
  series = {The mental lexicon},
  volume    = {13},
  journal   = {The mental lexicon},
  number    = {2},
  publisher = {John Benjamins Publishing Co.},
  address   = {Amsterdam},
  issn      = {1871-1340},
  doi       = {10.1075/ml.18002.jes},
  pages     = {186 -- 214},
  year      = {2019},
  abstract  = {Speaking a late-learned second language (L2) is supposed to yield more variable and less consistent output than speaking one's first language (L1), particularly with respect to reliably adhering to grammatical morphology. The current study investigates both internal processes involved in encoding morphologically complex words - by recording event-related brain potentials (ERPs) during participants' silent productions - and the corresponding overt output. We specifically examined compounds with plural or singular modifiers in English. Thirty-one advanced L2 speakers of English (L1: German) were compared to a control group of 20 L1 English speakers from an earlier study. We found an enhanced (right-frontal) negativity during (silent) morphological encoding for compounds produced from regular plural forms relative to compounds formed from irregular plurals, replicating the ERP effect obtained for the L1 group. The L2 speakers' overt productions, however, were significantly less consistent than those of the L1 speakers on the same task. We suggest that L2 speakers employ the same mechanisms for morphological encoding as L1 speakers, but with less reliance on grammatical constraints than L1 speakers.},
  language  = {en}
}
@article{ClahsenJessen2020,
  author    = {Clahsen, Harald and Jessen, Anna},
  title     = {Variability and its limits in bilingual word recognition},
  series = {The mental lexicon},
  volume    = {15},
  journal   = {The mental lexicon},
  number    = {2},
  publisher = {John Benjamins Publishing Co.},
  address   = {Amsterdam},
  issn      = {1871-1340},
  doi       = {10.1075/ml.20013.cla},
  pages     = {295 -- 329},
  year      = {2020},
  abstract  = {This study examines the processing of morphologically complex words focusing on how morphological (in addition to orthographic and semantic) factors affect bilingual word recognition. We report findings from a large experimental study with groups of bilingual (Turkish/German) speakers using the visual masked-priming technique. We found morphologically mediated effects on the response speed and the inter-individual variability within the bilingual participant group. We conclude that the grammar (qua morphological parsing) not only enhances speed of processing in bilingual language processing but also yields more uniform performance and thereby constrains variability within a group of otherwise heterogeneous individuals.},
  language  = {en}
}