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This paper describes general requirements for evaluating and documenting NLP tools with a focus on morphological analysers and the design of a Gold Standard. It is argued that any evaluation must be measurable and documentation thereof must be made accessible for any user of the tool. The documentation must be of a kind that it enables the user to compare different tools offering the same service, hence the descriptions must contain measurable values. A Gold Standard presents a vital part of any measurable evaluation process, therefore, the corpus-based design of a Gold Standard, its creation and problems that occur are reported upon here. Our project concentrates on SMOR, a morphological analyser for German that is to be offered as a web-service. We not only utilize this analyser for designing the Gold Standard, but also evaluate the tool itself at the same time. Note that the project is ongoing, therefore, we cannot present final results.
Corpus-based identification and disambiguation of reading indicators for German nominalizations
(2010)
Corpus data is often structurally and lexically ambiguous; corpus extraction methodologies thus must be made aware of ambiguities. Therefore, given an extraction task, all relevant ambiguities must be identified. To resolve these ambiguities, contextual data responsible for one or another reading is to be considered. In the context of our present work, German -ung-nominalizations and their sortal readings are under examination. A number of these nominalizations may be read as an event or a result, depending on the semantic group they belong to. Here, we concentrate on nominalizations of verbs of saying (henceforth: "verba dicendi"), identify their context partners and their influence on the sortal reading of the nominalizations in question. We present a tool which calculates the sortal reading of such nominalizations and thus may improve not only corpus extraction, but also e.g. machine translation. Lastly, we describe successful attempts to identify the correct sortal reading, conclusions and future work.
So far, comprehensive grammar descriptions of Northern Sotho have only been available in the form of prescriptive books aiming at teaching the language. This paper describes parts of the first morpho-syntactic description of Northern Sotho from a computational perspective (Faaß, 2010a). Such a description is necessary for implementing rule based, operational grammars. It is also essential for the annotation of training data to be utilised by statistical parsers. The work that we partially present here may hence provide a resource for computational processing of the language in order to proceed with producing linguistic representations beyond tagging, may it be chunking or parsing. The paper begins with describing significant Northern Sotho verbal morpho-syntactics (section 2). It is shown that the topology of the verb can be depicted as a slot system which may form the basis for computational processing (section 3). Note that the implementation of the described rules (section 4) and also coverage tests are ongoing processes upon that we will report in more detail at a later stage.
This paper describes the application of probabilistic part of speech taggers to the Dzongkha language. A tag set containing 66 tags is designed, which is based on the Penn Treebank. A training corpus of 40,247 tokens is utilized to train the model. Using the lexicon extracted from the training corpus and lexicon from the available word list, we used two statistical taggers for comparison reasons. The best result achieved was 93.1% accuracy in a 10-fold cross validation on the training set. The winning tagger was thereafter applied to annotate a 570,247 token corpus.
Nach einem kurzen Überblick über die heutige sprachökologische Situation in Lettland möchte ich dabei auf die Rolle der deutschen Sprache in verschiedenen Bereichen der lettischen Gesellschaft eingehen. Komplettiert wird der Überblick über die deutsche Sprache im heutigen Lettland durch einige Überlegungen zu Maßnahmen, die die Situation zugunsten des Deutschen ändern könnten.
L’équipe de Lyon étudie la façon dont les ressources plurilingues sont mobilisées dans des activités collaboratives au sein du travail d’équipe. La démarche analytique est inspirée de l’Analyse Conversationnelle d’emprunte ethnomethodologique, et considère comme centrale la relation entre ressources plurilingues et organisation située des usages linguistiques et des pratiques sociales. Ces deux aspects sont réflexivement articulés, les ressources plurilingues étant modelées par leur contexte d’utilisation, et les activités étant mutuellement contraintes et structurées par les ressources disponibles.
This paper represents a report on an e-tandem project conducted at Freiburg University (Germany) from the winter term 2009/2010 on. It started with a German-ltalian pilot course organised in cooperation with Pavia University (Italy). In order to promote autonomous language learning, the authors used several web-based applications, relying on Skype to enable full (i.e. visual, auditive) interaction between learning partners and on e-mails to let participants practise writing and reading in the respective foreign language. Additionally, participants were asked to compile a weekly electronic portfolio (EPOS) to record their improvements as well as their difficulties. In the paper, the structure of the pilot course will be described and a first balance will be drawn.
A central question in psycholinguistics is how the human brain processes language in real time. To answer this question, the differences between auditory and visual processing have to be considered. The present dissertation examines the extent to which event-related potentials (ERPs) in the human electroencephalogram (EEG) interact with different modes of presentation during sentence comprehension. Besides the two classical modalities, auditory and rapid serial visual presentation (RSVP), the monitoring of readers’ eye movements was chosen as a new mode of presentation. Here, the temporal paradox between neuronal ERP effects and behavioral effects in the eye movement record were of particular interest. Specifically, by concurrently measuring ERPs and eye movements in natural reading, the dissertation aimed to shed light on the counterintuitive fact that difficulties in sentence comprehension arise earlier in eye movement measures than in the corresponding neuronal ERP effects. In contrast to RSVP and the auditory modality, reading offers a parafoveal preview of upcoming words (Rayner 1998), which enables the brain to process information of words before these are fixated for the first time (in foveal vision). When the word Gegenteil in example (1) below is fixated and processed, the brain concurrently processes some information of the upcoming parafoveal words von and weiß. (1) Schwarz ist das Gegenteil von weiß. (2) Schwarz […] blau. (3) Schwarz […] nett. The parafoveal preview mostly provides orthographic (word form) information, while semantic information is not conveyed (Inhoff & Starr 2004; White 2008). Whereas word form and lexical meaning are processed simultaneously with RSVP and auditory presentation, the parafoveal preview in natural reading allows for a temporal decoupling such that word forms are processed before meaning. This is one reason for the faster information uptake in reading. The present dissertation is the first to systematically investigate the influence of the parafoveal preview in sentence processing. Participants read sentences such as in (1)-(3), in which two adjectives were either antonyms (1), semantically related non-antonyms (2), or semantically unrelated non-antonyms (3). ERPs were computed for the last fixation before the target word (the sentence-final word in 1-3), which was assumed to capture parafoveal processing, and for the first fixation on the target, that should reflect foveal processing. The results were compared to two experiments using identical stimuli with auditory and RSVP presentation, and the parafoveal preview clearly led to different ERP results. While the RSVP and auditory presentations replicated the finding of a P300 to the second antonym in (1) (Kutas & Iragui 1998; Roehm et al. 2007), there was no P300 in response to antonyms at any fixation position in natural reading. However, the dissociation of parafoveal and foveal processing in reading also made it possible to disentangle different processes underlying the N400. There was a reduced parafoveal N400 for (1,2) compared with (3), which could be attributed to the preactivation of the word forms of the expected antonyms and of semantically related non-antonyms. In foveal vision, all non-antonyms (2,3) showed an enhanced N400 compared with (1) because they were unexpected and implausible in the sentence context. This dissociation between the preactivation of a word-form and the contextual fit of a word’s meaning is impossible with the other two modes of presentation, because orthographic and semantic information become available almost at the same time and are thus processed simultaneously. Furthermore, the parafoveal N400 effect was not accompanied by changes in the duration of the corresponding fixation, whereas the foveal N400 was. Similarly, with the concurrent measurement of ERPs and eye movements, the temporal paradox described above remained, as effects in the eye movement record preceded the neuronal ERP effects. Further support for these central findings came from two additional experiments that investigated different stimuli with concurrent ERP-eye tracking measures. Altogether, the experiments revealed that the previous findings on the language-related N400 can be replicated with natural reading, but they can also be differentiated qualitatively by virtue of the characteristics of natural reading. Although the behavioral and neuronal effects mirrored one another, not every neuronal effect necessarily translates into a behavioral output. Finally, even concurrent ERP-eye tracking measures cannot resolve the temporal paradox.
Grammatiktheoretische Forschung, das hat die jüngste IDS-Jahrestagung wieder einmal plastisch vor Augen geführt, muss gedacht werden als zähes Ringen zweier grundsätzlich antagonistischer Prinzipien: Der reichhaltigen Fülle sprachlicher Okkurrenzen, deren gründlicher Auslotung ein beträchtlicher Teil der gegenwärtigen sprachtheoretisch und sprachtechnologisch ausgerichteten Anstrengung gewidmet ist, muss stets der Versuch gegenüberstehen, diese überbordende Varianz abstrahierend und generalisierend einzudämmen – ohne dabei die empirischen Befunde übermäßig und unzulässig zu nivellieren.
Grammars even trying to be as comprehensible as possible hardly avoid using technical terms unknown to novices. To overcome these inconveniencies, the grammatical information system grammis of the Institut für Deutsche Sprache incorporated a glossary specialized on terms used within the system. This glossary - actually named Grammatische Grundbegriffe (elementary terms of grammar) and tied by hyperlinks to technical terms in the core grammar' of grammis - offers short and simple explanations mainly by means of exemplification. The idea is to provide the users with provisional understanding to get along while following the main themes they are interested in. Explicitly, the glossary is not a stand-alone dictionary of grammatical terms, and it should not be regarded as one.