@phdthesis{Schmitz2008,
  author    = {Schmitz, Michaela},
  title     = {The perception of clauses in 6- and 8-month-old German-learning infants : influence of pause duration and the natural pause hierarchy},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-29078},
  school      = {Universit{\"a}t Potsdam},
  year      = {2008},
  abstract  = {The present dissertation focuses on the question whether and under which conditions infants recognise clauses in fluent speech and the role a prosodic marker such as a pause may have in the segmentation process. In the speech signal, syntactic clauses often coincide with intonational phrases (IPhs) (Nespor \& Vogel, 1986, p. 190), the boundaries of which are marked by changes in fundamental frequency (e.g., Price, Ostendorf, Shattuck-Hufnagel \& Fong, 1991), lengthening of the final syllable (e.g., Cooper \& Paccia-Cooper, 1980) and the occurrence of a pause (Nespor \& Vogel, 1986, p. 188). Thus, IPhs seem to be reliably marked in the speech stream and infants may use these cues to recognise them. Furthermore, corpus studies on the occurrence and distribution of pauses have revealed that there is a strong correlation between the duration of a pause and the type of boundary it marks (e.g., Butcher, 1981, for German). Pauses between words are either non-existent or short, pauses between phrases are a bit longer, and pauses between clauses and at sentence boundaries further increase in duration. This suggests the existence of a natural pause hierarchy that complements the prosodic hierarchy described by Nespor and Vogel (1986). These hierarchies on the side of the speech signal correspond to the syntactic hierarchy of a language. In the present study, five experiments using the Headturn preference paradigm (Hirsh-Pasek, Kemler Nelson, Jusczyk, Cassidy, Druss \& Kennedy, 1987) were conducted to investigate German-learning 6- and 8-month-olds' use of pauses to recognise clauses in the signal and their sensitivity to the natural pause hierarchy. Previous studies on English-learning infants' recognition of clauses (Hirsh-Pasek et al., 1987; Nazzi, Kemler Nelson, Jusczyk \& Jusczyk, 2000) have found that infants as young as 6 months recognise clauses in fluent speech. Recently, Seidl and colleagues have begun to investigate the status the pause may have in this process (Seidl, 2007; Johnson \& Seidl, 2008; Seidl \& Cristi{\`a}, 2008). However, none of these studies investigated infants' sensitivity to the natural pause hierarchy and especially the sensitivity to the correlation between pause durations and the respective within-sentence clause boundaries / sentence boundaries. To address these questions highly controlled stimuli were used. In all five experiments the stimuli were sentences consisting of two IPhs which each coincided with a syntactic clause. In the first three experiments pauses were inserted either at clause and sentence boundaries or within the first clause and the sentence boundaries. The duration of the pauses varied between the experiments. The results show that German-learning 6-month-olds recognise clauses in the speech stream, but only in a condition in which the duration of the pauses conforms to the mean duration of pauses found at the respective boundaries in German. Experiments 4 and 5 explicitly addressed the question of infants' sensitivity to the natural pause hierarchy by inserting pauses at the clause and sentence boundaries only. Their durations were either conforming to the natural pause hierarchy or were being reversed. The results of these experiments provide evidence that 8-, but not 6-month-olds seem to be sensitive to the correlation of the duration of pauses and the type of boundary they demarcate. The present study provides first evidence that infants not only use pauses to recognise clause and sentence boundaries, but are sensitive to the duration and distribution of pauses in their native language as reflected in the natural pause hierarchy.},
  language  = {en}
}
@misc{BaerHenney2009,
  type      = {Master Thesis},
  author    = {Baer-Henney, Dinah},
  title     = {On natural and probabilisic effects during acquisition of morphophonemic alternations},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-36819},
  school      = {Universit{\"a}t Potsdam},
  year      = {2009},
  abstract  = {The acquisition of phonological alternations consists of many aspects as discussions in the relevant literature show. There are contrary findings about the role of naturalness. A natural process is grounded in phonetics; they are easy to learn, even in second language acquisition when adults have to learn certain processes that do not occur in their native language. There is also evidence that unnatural - arbitrary - rules can be learned. Current work on the acquisition of morphophonemic alternations suggests that their probability of occurrence is a crucial factor in acquisition. I have conducted an experiment to investigate the effects of naturalness as well as of probability of occurrence with 80 adult native speakers of German. It uses the Artificial Grammar paradigm: Two artificial languages were constructed, each with a particular alternation. In one language the alternation is natural (vowel harmony); in the other language the alternation is arbitrary (a vowel alternation depends on the sonorancy of the first consonant of the stem). The participants were divided in two groups, one group listened to the natural alternation and the other group listened to the unnatural alternation. Each group was divided into two subgroups. One subgroup then was presented with material in which the alternation occurred frequently and the other subgroup was presented with material in which the alternation occurred infrequently. After this exposure phase every participant was asked to produce new words during the test phase. Knowledge about the language-specific alternation pattern was needed to produce the forms correctly as the phonological contexts demanded certain alternants. The group performances have been compared with respect to the effects of naturalness and probability of occurrence. The natural rule was learned more easily than the unnatural one. Frequently presented rules were not learned more easily than the ones that were presented less frequently. Moreover, participants did not learn the unnatural rule at all, whether this rule was presented frequently or infrequently did not matter. There was a tendency that the natural rule was learned more easily if presented frequently than if presented infrequently, but it was not significant due to variability across participants.},
  language  = {en}
}
@phdthesis{Kuehnast2010,
  author    = {Kuehnast, Milena},
  title     = {Processing negative imperatives in Bulgarian : evidence from normal, aphasic and child language},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-45826},
  school      = {Universit{\"a}t Potsdam},
  year      = {2010},
  abstract  = {The incremental nature of sentence processing raises questions about the way the information of incoming functional elements is accessed and subsequently employed in building the syntactic structure which sustains interpretation processes. The present work approaches these questions by investigating the negative particle ne used for sentential negation in Bulgarian and its impact on the overt realisation and the interpretation of imperative inflexion, bound aspectual morphemes and clitic pronouns in child, adult and aphasic language. In contrast to other Slavic languages, Bulgarian negative imperatives (NI) are grammatical only with imperfective verbs. We argue that NI are instantiations of overt aspectual coercion induced by the presence of negation as a temporally sensitive sentential operator. The scope relation between imperative mood, negation, and aspect yields the configuration of the imperfective present which in Bulgarian has to be overtly expressed and prompts the imperfective marking of the predicate. The regular and transparent application of the imperfectivising mechanism relates to the organisation of the TAM categories in Bulgarian which not only promotes the representation of fine perspective shifts but also provides for their distinct morphological expression. Using an elicitation task with NI, we investigated the way 3- and 4-year-old children represent negation in deontic contexts as reflected in their use of aspectually appropriate predicates. Our findings suggest that children are sensitive to the imperfectivity requirement in NI from early on. The imperfectivisation strategies reveal some differences from the target morphological realisation. The relatively low production of target imperfectivised prefixed verbs cannot be explained with morphological processing deficits, but rather indicates that up to the age of five children experience difficulties to apply a progressive view point to accomplishments. Two self-paced reading studies present evidence that neurologically unimpaired Bulgarian speakers profit from the syntactic and prosodic properties of negation during online sentence comprehension. The imperfectivity requirement negation imposes on the predicate speeds up lexical access to imperfective verbs. Similarly, clitic pronouns are more accessible after negation due to the phono-syntactic properties of clitic clusters. As the experimental stimuli do not provide external discourse referents, personal pronouns are parsed as object agreement markers. Without subsequent resolution, personal pronouns appear to be less resource demanding than reflexive clitics. This finding is indicative of the syntax-driven co-reference establishment processes triggered through the lexical specification of reflexive clitics. The results obtained from Bulgarian Broca's aphasics show that they exhibit processing patterns similar to those of the control group. Notwithstanding their slow processing speed, the agrammatic group showed no impairment of negation as reflected by their sensitivity to the aspectual requirements of NI, and to the prosodic constraints on clitic placement. The aphasics were able to parse the structural dependency between mood, negation and aspect as functional categories and to represent it morphologically. The prolonged reaction times (RT) elicited by prefixed verbs indicate increasing processing costs due to the semantic integration of prefixes as perfectivity markers into an overall imperfective construal. This inference is supported by the slower RT to reflexive clitics, which undergo a structurally triggered resolution. Evaluated against cross-linguistic findings, the obtained result strongly suggests that aphasic performance with pronouns depends on the interpretation efforts associated with co-reference establishment and varies due to availability of discourse referents. The investigation of normal and agrammatic processing of Bulgarian NI presents support for the hypothesis that the comprehension deficits in Broca's aphasia result from a slowed-down implementation of syntactic operations. The protracted structure building consumes processing resources and causes temporal mismatches with other processes sustaining sentence comprehension. The investigation of the way Bulgarian children and aphasic speakers process NI reveals that both groups are highly sensitive to the imperfective constraint on the aspectual construal imposed by the presence of negation. The imperfective interpretation requires access to morphologically complex verb forms which contain aspectual morphemes with conflicting semantic information - perfective prefixes and imperfective suffixes. Across modalities, both populations exhibit difficulties in processing prefixed imperfectivised verbs which as predicates of negative imperative sentences reflect the inner perspective the speaker and the addressee need to take towards a potentially bounded situation description.},
  language  = {en}
}
@phdthesis{BrandtKobele2014,
  author    = {Brandt-Kobele, Oda-Christina},
  title     = {Comprehension of verb inflection in German-speaking children},
  publisher = {Universit{\"a}tsverlag Potsdam},
  address   = {Potsdam},
  isbn      = {978-3-86956-216-2},
  issn      = {1869-3822},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-62046},
  school      = {Universit{\"a}t Potsdam},
  pages     = {xx, 325},
  year      = {2014},
  abstract  = {Previous studies on the acquisition of verb inflection in normally developing children have revealed an astonishing pattern: children use correctly inflected verbs in their own speech but fail to make use of verb inflections when comprehending sentences uttered by others. Thus, a three-year old might well be able to say something like 'The cat sleeps on the bed', but fails to understand that the same sentence, when uttered by another person, refers to only one sleeping cat but not more than one. The previous studies that have examined children's comprehension of verb inflections have employed a variant of a picture selection task in which the child was asked to explicitly indicate (via pointing) what semantic meaning she had inferred from the test sentence. Recent research on other linguistic structures, such as pronouns or focus particles, has indicated that earlier comprehension abilities can be found when methods are used that do not require an explicit reaction, like preferential looking tasks. This dissertation aimed to examine whether children are truly not able to understand the connection the the verb form and the meaning of the sentence subject until the age of five years or whether earlier comprehension can be found when a different measure, preferential looking, is used. Additionally, children's processing of subject-verb agreement violations was examined. The three experiments of this thesis that examined children's comprehension of verb inflections revealed the following: German-speaking three- to four-year old children looked more to a picture showing one actor when hearing a sentence with a singular inflected verb but only when their eye gaze was tracked and they did not have to perform a picture selection task. When they were asked to point to the matching picture, they performed at chance-level. This pattern indicates asymmetries in children's language performance even within the receptive modality. The fourth experiment examined sensitivity to subject-verb agreement violations and did not reveal evidence for sensitivity toward agreement violations in three- and four-year old children, but only found that children's looking patterns were influenced by the grammatical violations at the age of five. The results from these experiments are discussed in relation to the existence of a production-comprehension asymmetry in the use of verb inflections and children's underlying grammatical knowledge.},
  language  = {en}
}
@misc{Fengler2015,
  author    = {Fengler, Anja},
  title     = {How the brain attunes to sentence processing},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-85820},
  pages     = {XVI, 208},
  year      = {2015},
  abstract  = {While children acquire new words and simple sentence structures extremely fast and without much effort, the ability to process complex sentences develops rather late in life. Although the conjoint occurrence between brain-structural and brain-functional changes, the decrease of plasticity, and changes in cognitive abilities suggests a certain causality between these processes, concrete evidence for the relation between brain development, language processing, and language performance is rare. Therefore, the current dissertation investigates the tripartite relationship between behavior (in the form of language performance and cognitive maturation as prerequisite for language processing), brain structure (in the form of gray matter maturation), and brain function (in the form of brain activation evoked by complex sentence processing). Previous developmental studies indicate a missing increase of activation in accordance to sentence complexity (functional selectivity) in language-relevant brain areas in children. To determine the factors contributing to the functional development of language-relevant brain areas, different methodologies and data acquisition techniques were used to investigate the processing of center-embedded sentences in 5- and 6-year-old children, 7- and 8-year-old children, and adults. Behavioral results indicate that children between 5 and 8 years show difficulties in processing double embedded sentences and that their performance for these type of sentences is positively correlated with digit span. In 7- and 8-year-old children, it was found that especially the processing of long-distance relations between the initial phrase and its corresponding verb appears to be associated with the subject's verbal working memory capacity. In contrast, children's performance for double embedded sentences in the younger age group positively correlated with their performance in a standardized sentence comprehension test. This finding supports the hypothesis that processing difficulties in this age group may be mainly attributed to difficulties in processing case marking information. These findings are discussed with respect to current accounts of language and working memory development. A second study aimed at investigating the structural maturation of brain areas involved in sentence comprehension. To do this, whole-brain magnetic resonance images from 59 children between 5 and 8 years were collected and children's gray matter was analyzed by using voxel-based morphometry. Children's grammatical proficiency was assessed by a standardized sentence comprehension test. A confirmatory factory analysis corroborated a grammar-relevant and a verbal working memory-relevant factor underlying the measured performance. While children's ability to assign thematic roles is positively correlated with gray matter probability (GMP) in the left inferior temporal gyrus and the left inferior frontal gyrus, verbal working memory-related performance is positively correlated with GMP in the left parietal operculum extending into the posterior superior temporal gyrus. These areas have been previously shown to be differentially engaged in adults' complex sentence processing. Thus, the findings of the second study suggest a specific correspondence between children's GMP in language-relevant brain regions and differential cognitive abilities which underlie complex sentence comprehension. In a third study, functional brain activity during the processing of center-embedded sentences was investigated in three different age groups (5-6 years, 7-8 years, and adults). Although all age groups engage a qualitatively comparable network of the left pars opercularis (PO), the left inferior parietal lobe extending into the posterior superior temporal gyrus (IPL/pSTG), the supplementary motor area (SMA) and the cerebellum, functional selectivity of these regions was only observable in adults. However, functional activation of the language-related regions (PO and IPL/pSTG) predicted sentence comprehension performance for all age groups. To solve the question of the complex interplay between different maturational factors, a fourth study analyzed the predictive power of gray matter probability, verbal working memory capacity, and behavioral differences in performance for simple and complex sentence for the functional selectivity of each activated region. These analyses revealed that the establishment of the adult-like functional selectivity for complex sentences is predicted by a reduction of the left PO's gray matter probability across age groups while that of the IPL/pSTG is additionally predicted by verbal working memory capacity. Taken all findings together, the current thesis provides evidence that both structural brain maturation and verbal working memory expansion provide the basis for the emergence of functional selectivity in language-related brain regions leading to more efficient sentence processing during development.},
  language  = {en}
}
@phdthesis{Sauermann2016,
  author    = {Sauermann, Antje},
  title     = {Impact of the type of referring expression on the acquisition of word order variation},
  publisher = {Universit{\"a}tsverlag Potsdam},
  address   = {Potsdam},
  isbn      = {978-3-86956-330-5},
  issn      = {1869-3822},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-89409},
  school      = {Universit{\"a}t Potsdam},
  year      = {2016},
  abstract  = {This dissertation examines the impact of the type of referring expression on the acquisition of word order variation in German-speaking preschoolers. A puzzle in the area of language acquisition concerns the production-comprehension asymmetry for non-canonical sentences like "Den Affen f{\"a}ngt die Kuh." ("The monkey, the cow chases."), that is, preschoolers usually have difficulties in accurately understanding non-canonical sentences approximately until age six (e.g., Dittmar et al., 2008) although they produce non-canonical sentences already around age three (e.g., Poeppel \& Wexler, 1993; Weissenborn, 1990). This dissertation investigated the production and comprehension of non-canonical sentences to address this issue. Three corpus analyses were conducted to investigate the impact of givenness, topic status and the type of referring expression on word order in the spontaneous speech of two- to four-year-olds and the child-directed speech produced by their mothers. The positioning of the direct object in ditransitive sentences was examined; in particular, sentences in which the direct object occurred before or after the indirect object in the sentence-medial positions and sentences in which it occurred in the sentence-initial position. The results reveal similar ordering patterns for children and adults. Word order variation was to a large extent predictable from the type of referring expression, especially with respect to the word order involving the sentence-medial positions. Information structure (e.g., topic status) had an additional impact only on word order variation that involved the sentence-initial position. Two comprehension experiments were conducted to investigate whether the type of referring expression and topic status influences the comprehension of non-canonical transitive sentences in four- and five-year-olds. In the first experiment, the topic status of the one of the sentential arguments was established via a preceding context sentence, and in the second experiment, the type of referring expression for the sentential arguments was additionally manipulated by using either a full lexical noun phrase (NP) or a personal pronoun. The results demonstrate that children's comprehension of non-canonical sentences improved when the topic argument was realized as a personal pronoun and this improvement was independent of the grammatical role of the arguments. However, children's comprehension was not improved when the topic argument was realized as a lexical NP. In sum, the results of both production and comprehension studies support the view that referring expressions may be seen as a sentence-level cue to word order and to the information status of the sentential arguments. The results highlight the important role of the type of referring expression on the acquisition of word order variation and indicate that the production-comprehension asymmetry is reduced when the type of referring expression is considered.},
  language  = {en}
}
@phdthesis{Fengler2016,
  author    = {Fengler, Anja},
  title     = {How the brain attunes to sentence processing},
  series = {MPI series in human cognitive and brain sciences ; 174},
  journal   = {MPI series in human cognitive and brain sciences ; 174},
  isbn      = {978-3-941504-59-2},
  pages     = {XVI, 208},
  year      = {2016},
  abstract  = {While children acquire new words and simple sentence structures extremely fast and without much effort, the ability to process complex sentences develops rather late in life. Although the conjoint occurrence between brain-structural and brain-functional changes, the decrease of plasticity, and changes in cognitive abilities suggests a certain causality between these processes, concrete evidence for the relation between brain development, language processing, and language performance is rare. Therefore, the current dissertation investigates the tripartite relationship between behavior (in the form of language performance and cognitive maturation as prerequisite for language processing), brain structure (in the form of gray matter maturation), and brain function (in the form of brain activation evoked by complex sentence processing). Previous developmental studies indicate a missing increase of activation in accordance to sentence complexity (functional selectivity) in language-relevant brain areas in children. To determine the factors contributing to the functional development of language-relevant brain areas, different methodologies and data acquisition techniques were used to investigate the processing of center-embedded sentences in 5- and 6-year-old children, 7- and 8-year-old children, and adults. Behavioral results indicate that children between 5 and 8 years show difficulties in processing double embedded sentences and that their performance for these type of sentences is positively correlated with digit span. In 7- and 8-year-old children, it was found that especially the processing of long-distance relations between the initial phrase and its corresponding verb appears to be associated with the subject's verbal working memory capacity. In contrast, children's performance for double embedded sentences in the younger age group positively correlated with their performance in a standardized sentence comprehension test. This finding supports the hypothesis that processing difficulties in this age group may be mainly attributed to difficulties in processing case marking information. These findings are discussed with respect to current accounts of language and working memory development. A second study aimed at investigating the structural maturation of brain areas involved in sentence comprehension. To do this, whole-brain magnetic resonance images from 59 children between 5 and 8 years were collected and children's gray matter was analyzed by using voxel-based morphometry. Children's grammatical proficiency was assessed by a standardized sentence comprehension test. A confirmatory factory analysis corroborated a grammar-relevant and a verbal working memory-relevant factor underlying the measured performance. While children's ability to assign thematic roles is positively correlated with gray matter probability (GMP) in the left inferior temporal gyrus and the left inferior frontal gyrus, verbal working memory-related performance is positively correlated with GMP in the left parietal operculum extending into the posterior superior temporal gyrus. These areas have been previously shown to be differentially engaged in adults' complex sentence processing. Thus, the findings of the second study suggest a specific correspondence between children's GMP in language-relevant brain regions and differential cognitive abilities which underlie complex sentence comprehension. In a third study, functional brain activity during the processing of center-embedded sentences was investigated in three different age groups (5-6 years, 7-8 years, and adults). Although all age groups engage a qualitatively comparable network of the left pars opercularis (PO), the left inferior parietal lobe extending into the posterior superior temporal gyrus (IPL/pSTG), the supplementary motor area (SMA) and the cerebellum, functional selectivity of these regions was only observable in adults. However, functional activation of the language-related regions (PO and IPL/pSTG) predicted sentence comprehension performance for all age groups. To solve the question of the complex interplay between different maturational factors, a fourth study analyzed the predictive power of gray matter probability, verbal working memory capacity, and behavioral differences in performance for simple and complex sentence for the functional selectivity of each activated region. These analyses revealed that the establishment of the adult-like functional selectivity for complex sentences is predicted by a reduction of the left PO's gray matter probability across age groups while that of the IPL/pSTG is additionally predicted by verbal working memory capacity. Taken all findings together, the current thesis provides evidence that both structural brain maturation and verbal working memory expansion provide the basis for the emergence of functional selectivity in language-related brain regions leading to more efficient sentence processing during development.},
  language  = {en}
}
@phdthesis{HolzgrefeLang2017,
  author    = {Holzgrefe-Lang, Julia},
  title     = {Prosodic phrase boundary perception in adults and infants},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-405943},
  school      = {Universit{\"a}t Potsdam},
  pages     = {VIII, 141},
  year      = {2017},
  abstract  = {Prosody is a rich source of information that heavily supports spoken language comprehension. In particular, prosodic phrase boundaries divide the continuous speech stream into chunks reflecting the semantic and syntactic structure of an utterance. This chunking or prosodic phrasing plays a critical role in both spoken language processing and language acquisition. Aiming at a better understanding of the underlying processing mechanisms and their acquisition, the present work investigates factors that influence prosodic phrase boundary perception in adults and infants. Using the event-related potential (ERP) technique, three experimental studies examined the role of prosodic context (i.e., phrase length) in German phrase boundary perception and of the main prosodic boundary cues, namely pitch change, final lengthening, and pause. With regard to the boundary cues, the dissertation focused on the questions which cues or cue combination are essential for the perception of a prosodic boundary and on whether and how this cue weighting develops during infancy. Using ERPs is advantageous because the technique captures the immediate impact of (linguistic) information during on-line processing. Moreover, as it can be applied independently of specific task demands or an overt response performance, it can be used with both infants and adults. ERPs are particularly suitable to study the time course and underlying mechanisms of boundary perception, because a specific ERP component, the Closure Positive Shift (CPS) is well established as neuro-physiological indicator of prosodic boundary perception in adults. The results of the three experimental studies first underpin that the prosodic context plays an immediate role in the processing of prosodic boundary information. Moreover, the second study reveals that adult listeners perceive a prosodic boundary also on the basis of a sub-set of the boundary cues available in the speech signal. Both ERP and simultaneously collected behavioral data (i.e., prosodic judgements) suggest that the combination of pitch change and final lengthening triggers boundary perception; however, when presented as single cues, neither pitch change nor final lengthening were sufficient. Finally, testing six- and eight-month-old infants shows that the early sensitivity for prosodic information is reflected in a brain response resembling the adult CPS. For both age groups, brain responses to prosodic boundaries cued by pitch change and final lengthening revealed a positivity that can be interpreted as a CPS-like infant ERP component. In contrast, but comparable to the adults' response pattern, pitch change as a single cue does not provoke an infant CPS. These results show that infant phrase boundary perception is not exclusively based on pause detection and hint at an early ability to exploit subtle, relational prosodic cues in speech perception.},
  language  = {en}
}
@phdthesis{Trautwein2019,
  author    = {Trautwein, Jutta},
  title     = {The Mental lexicon in acquisition},
  doi       = {10.25932/publishup-43431},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-434314},
  school      = {Universit{\"a}t Potsdam},
  pages     = {IV, 177},
  year      = {2019},
  abstract  = {The individual's mental lexicon comprises all known words as well related infor-mation on semantics, orthography and phonology. Moreover, entries connect due to simi-larities in these language domains building a large network structure. The access to lexical information is crucial for processing of words and sentences. Thus, a lack of information in-hibits the retrieval and can cause language processing difficulties. Hence, the composition of the mental lexicon is essential for language skills and its assessment is a central topic of lin-guistic and educational research. In early childhood, measurement of the mental lexicon is uncomplicated, for example through parental questionnaires or the analysis of speech samples. However, with growing content the measurement becomes more challenging: With more and more words in the mental lexicon, the inclusion of all possible known words into a test or questionnaire be-comes impossible. That is why there is a lack of methods to assess the mental lexicon for school children and adults. For the same reason, there are only few findings on the courses of lexical development during school years as well as its specific effect on other language skills. This dissertation is supposed to close this gap by pursuing two major goals: First, I wanted to develop a method to assess lexical features, namely lexicon size and lexical struc-ture, for children of different age groups. Second, I aimed to describe the results of this method in terms of lexical development of size and structure. Findings were intended to help understanding mechanisms of lexical acquisition and inform theories on vocabulary growth. The approach is based on the dictionary method where a sample of words out of a dictionary is tested and results are projected on the whole dictionary to determine an indi-vidual's lexicon size. In the present study, the childLex corpus, a written language corpus for children in German, served as the basis for lexicon size estimation. The corpus is assumed to comprise all words children attending primary school could know. Testing a sample of words out of the corpus enables projection of the results on the whole corpus. For this purpose, a vocabulary test based on the corpus was developed. Afterwards, test performance of virtual participants was simulated by drawing different lexicon sizes from the corpus and comparing whether the test items were included in the lexicon or not. This allowed determination of the relation between test performance and total lexicon size and thus could be transferred to a sample of real participants. Besides lexicon size, lexical content could be approximated with this approach and analyzed in terms of lexical structure. To pursue the presented aims and establish the sampling method, I conducted three consecutive studies. Study 1 includes the development of a vocabulary test based on the childLex corpus. The testing was based on the yes/no format and included three versions for different age groups. The validation grounded on the Rasch Model shows that it is a valid instrument to measure vocabulary for primary school children in German. In Study 2, I estab-lished the method to estimate lexicon sizes and present results on lexical development dur-ing primary school. Plausible results demonstrate that lexical growth follows a quadratic function starting with about 6,000 words at the beginning of school and about 73,000 words on average for young adults. Moreover, the study revealed large interindividual differences. Study 3 focused on the analysis of network structures and their development in the mental lexicon due to orthographic similarities. It demonstrates that networks possess small-word characteristics and decrease in interconnectivity with age. Taken together, this dissertation provides an innovative approach for the assessment and description of the development of the mental lexicon from primary school onwards. The studies determine recent results on lexical acquisition in different age groups that were miss-ing before. They impressively show the importance of this period and display the existence of extensive interindividual differences in lexical development. One central aim of future research needs to address the causes and prevention of these differences. In addition, the application of the method for further research (e.g. the adaptation for other target groups) and teaching purposes (e.g. adaptation of texts for different target groups) appears to be promising.},
  language  = {en}
}
@phdthesis{Chen2022,
  author    = {Chen, Hui Ching},
  title     = {Acquisition of focus - in a cross-linguistic perspective},
  doi       = {10.25932/publishup-55345},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-553458},
  school      = {Universit{\"a}t Potsdam},
  pages     = {xiii, 130},
  year      = {2022},
  abstract  = {In dieser Dissertation untersuchen wir, wie chinesischen Muttersprachler und deutschen Muttersprachler, sowohl die Erwachsenen als auch die Kinder, verschiedene linguistische Mittel, wie z. B. Wortstellungsinformationen, prosodische und lexikalische Mittel im Sprachverst{\"a}ndnis korrekt interpretieren.},
  language  = {en}
}