@article{AllefeldFrischSchlesewsky2005,
  author    = {Allefeld, Carsten and Frisch, Stefan and Schlesewsky, Matthias},
  title     = {Detection of early cognitive processing by event-related phase synchronization analysis},
  issn      = {0959-4965},
  year      = {2005},
  abstract  = {In order to investigate the temporal characteristics of cognitive processing, we apply multivariate phase synchronization analysis to event-related potentials. The experimental design combines a semantic incongruity in a sentence context with a physical mismatch (color change). In the ERP average, these result in an N400 component and a P300-like positivity, respectively. Synchronization analysis shows an effect of global desynchronization in the theta band around 288 ms after stimulus presentation for the semantic incongruity, while the physical mismatch elicits an increase of global synchronization in the alpha band around 204 ms. Both of these effects clearly precede those in the ERP aver-age. Moreover, the delay between synchronization effect and ERP component correlates with the complexity Of the cognitive processes. (C) 2005 Lippincott Williams Wilkins},
  language  = {en}
}
@article{FrischBeimGraben2005,
  author    = {Frisch, Stefan and Beim Graben, Peter},
  title     = {Finding needles in haystacks : Symbolic resonance analysis of event-related potentials unveils different processing demands},
  year      = {2005},
  abstract  = {Previous ERP studies have found an N400-P600 pattern in sentences in which the number of arguments does not match the number of arguments that the verb can take. In the present study, we elaborate on this question by investigating whether the case of the mismatching object argument in German (accusative/direct object versus dative/ indirect object) affects processing differently. In general, both types of mismatches elicited a biphasic N400 P600 response in the ERP. However, traditional voltage average analysis was unable to reveal differences between the two mismatching conditions, that is, between a mismatching accusative versus dative. Therefore, we employed a recently developed method on ER-P data analysis, the symbolic resonance analysis (SRA), where EEG epochs are symbolically encoded in sequences of three symbols depending on a given parameter, the encoding threshold. We found a larger proportion of threshold crossing events with negative polarity in the N400 time window for a mismatching dative argument compared to a mismatching accusative argument. By contrast, the proportion of threshold crossing events with positive polarity was smaller for dative in the P600 time window. We argue that this difference is due to the phenomenon of "free dative" in German. This result also shows that the SRA provides a useful tool for revealing ERP differences that cannot be discovered using the traditional voltage average analysis. (c) 2005 Elsevier B.V. All rights reserved},
  language  = {en}
}
@article{DrenhausBeimGrabenSaddyetal.2005,
  author    = {Drenhaus, Heiner and Beim Graben, Peter and Saddy, Douglas and Frisch, Stefan},
  title     = {On the processing of negative polarity constructions revealed by the symbolic resonance analysis},
  issn      = {0898-929X},
  year      = {2005},
  language  = {en}
}
@article{FrischSchlesewskyWegner2005,
  author    = {Frisch, Stefan and Schlesewsky, Matthias and Wegner, H.},
  title     = {The interaction of morphological case and word order constraints : Cross-linguistic ERP evidence from German, Russian and Finnish},
  year      = {2005},
  language  = {en}
}
@article{FrischSchlesewsky2005,
  author    = {Frisch, Stefan and Schlesewsky, Matthias},
  title     = {The resolution of case conflicts from a neurophysiological perspective},
  year      = {2005},
  abstract  = {We present two ERP experiments examining the resolution of language processing conflicts involving the multidimensional linguistic feature case, which determines processing in both syntactic and interpretive respects. Ungrammatical German structures with two identically case-marked arguments (double subject or double object constructions) were tested. In earlier studies, double subject constructions have been shown to elicit a biphasic pattern consisting of an N400 effect (a marker of thematic integration problems) followed by a P600 effect (a marker of syntactic ill-formedness). Here, we compare double nominative (subject case) constructions with double datives (indirect object case; Experiment 1) and double accusatives (direct object case; Experiment 2). All types of double case ungrammaticalities elicited a biphasic N400-P600 response. However, double datives differed from double nominatives in that they elicited a larger P600, suggesting that the ill-formedness is more salient in structures with two dative arguments. Double accusatives, by contrast, elicited a stronger N400 in comparison to double nominatives, suggesting that they induce more severe semantic-thematic integration problems. The results demonstrate that the human language comprehension system is sensitive to fine grained linguistic distinctions between different cases and utilizes these in its attempts to solve processing conflicts. (c) 2005 Elsevier B.V. All rights reserved},
  language  = {en}
}
@article{BeimGrabenFrischFinketal.2005,
  author    = {Beim Graben, Peter and Frisch, Stefan and Fink, A. and Saddy, Douglas and Kurths, J{\"u}rgen},
  title     = {Topographic voltage and coherence mapping of brain potentials by means of the symbolic resonance analysis},
  issn      = {1539-3755},
  year      = {2005},
  abstract  = {We apply the recently developed symbolic resonance analysis to electroencephalographic measurements of event- related brain potentials (ERPs) in a language processing experiment by using a three-symbol static encoding with varying thresholds for analyzing the ERP epochs, followed by a spin-flip transformation as a nonlinear filter. We compute an estimator of the signal-to-noise ratio (SNR) for the symbolic dynamics measuring the coherence of threshold-crossing events. Hence, we utilize the inherent noise of the EEG for sweeping the underlying ERP components beyond the encoding thresholds. Plotting the SNR computed within the time window of a particular ERP component (the N400) against the encoding thresholds, we find different resonance curves for the experimental conditions. The maximal differences of the SNR lead to the estimation of optimal encoding thresholds. We show that topographic brain maps of the optimal threshold voltages and of their associated coherence differences are able to dissociate the underlying physiological processes, while corresponding maps gained from the customary voltage averaging technique are unable to do so},
  language  = {en}
}