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  • Online Resource  (15)
  • 2020-2024  (15)
  • Hildebrandt, Peter  (9)
  • Hildebrandt, Andrea  (6)
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  • Online Resource  (15)
  • Book  (1)
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  • 1
    UID:
    edochu_18452_22894
    Format: 1 Online-Ressource (11 Seiten)
    Content: At the group level, women consistently perform better in face memory tasks than men and also show earlier and larger N170 components of event-related brain potentials (ERP), considered to indicate perceptual structural encoding of faces. Here we investigated sex differences in the relationship between the N170 and face memory performance in 152 men and 141 women at group mean and individual differences levels. ERPs and performance were measured in separate tasks, avoiding statistical dependency between the two. We confirmed previous findings about superior face memory in women and a—sex-independent—negative relationship between N170 latency and face memory. However, whereas in men, better face memory was related to larger N170 components, face memory in women was unrelated with the amplitude or latency of the N170. These data provide solid evidence that individual differences in face memory within men are at least partially related to more intense structural face encoding.
    Content: Peer Reviewed
    Note: This article was supported by the German Research Foundation (DFG) and the Open Access Publication Fund of Humboldt-Universität zu Berlin.
    In: Social cognitive and affective neuroscience, Oxford : Oxford Univ. Press, 15,2020,5, Seiten 587-597
    Language: English
    URL: Volltext  (kostenfrei)
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  • 2
    UID:
    b3kat_BV046703848
    Format: 1 Online-Ressource
    Language: English
    URL: Volltext  (kostenfrei)
    Author information: Sommer, Werner
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  • 3
    UID:
    edochu_18452_28836
    Format: 1 Online-Ressource (4 Seiten)
    Content: A mononuclear oxoiron(IV) complex 1-trans bearing two equatorial sulfur ligations is synthesized and characterized as an active-site model of the elusive sulfur-ligated FeIV[double bond, length as m-dash]O intermediates in non-heme iron oxygenases. The introduction of sulfur ligands weakens the Fe[double bond, length as m-dash]O bond and enhances the oxidative reactivity of the FeIV[double bond, length as m-dash]O unit with a diminished deuterium kinetic isotope effect, thereby providing a compelling rationale for nature's use of the cis-thiolate ligated oxoiron(IV) motif in key metabolic transformations.
    Content: Peer Reviewed
    In: Cambridge : Soc., 57,23, Seiten 2947-2950
    Language: English
    URL: Volltext  (kostenfrei)
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  • 4
    UID:
    edochu_18452_24002
    Format: 1 Online-Ressource (22 Seiten)
    Content: The study of socio-cognitive abilities emerged from intelligence research, and their specificity remains controversial until today. In recent years, the psychometric structure of face cognition (FC)—a basic facet of socio-cognitive abilities—was extensively studied. In this review, we summarize and discuss the divergent psychometric structures of FC in easy and difficult tasks. While accuracy in difficult tasks was consistently shown to be face-specific, the evidence for easy tasks was inconsistent. The structure of response speed in easy tasks was mostly—but not always—unitary across object categories, including faces. Here, we compare studies to identify characteristics leading to face specificity in easy tasks. The following pattern emerges: in easy tasks, face specificity is found when modeling speed in a single task; however, when modeling speed across multiple, different easy tasks, only a unitary factor structure is reported. In difficult tasks, however, face specificity occurs in both single task approaches and task batteries. This suggests different cognitive mechanisms behind face specificity in easy and difficult tasks. In easy tasks, face specificity relies on isolated cognitive sub-processes such as face identity recognition. In difficult tasks, face-specific and task-independent cognitive processes are employed. We propose a descriptive model and argue for FC to be integrated into common taxonomies of intelligence.
    Content: Peer Reviewed
    In: Journal of Intelligence : open access journal, Basel : MDPI, 9,2021,2
    Language: English
    URL: Volltext  (kostenfrei)
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  • 5
    UID:
    edochu_18452_25190
    Format: 1 Online-Ressource (17 Seiten)
    Content: According to the shared signal hypothesis (SSH) the impact of facial expressions on emotion processing partially depends on whether the gaze is directed toward or away from the observer. In autism spectrum disorder (ASD) several aspects of face processing have been found to be atypical, including attention to eye gaze and the identification of emotional expressions. However, there is little research on how gaze direction affects emotional expression processing in typically developing (TD) individuals and in those with ASD. This question is investigated here in two multimodal experiments. Experiment 1 required processing eye gaze direction while faces differed in emotional expression. Forty-seven children (aged 9–12 years) participated. Their Autism Diagnostic Observation Schedule (ADOS) scores ranged from 0 to 6 in the experiment. Event-related potentials (ERPs) were sensitive to gaze direction and emotion, but emotion processing did not depend on gaze direction. However, for angry faces the gaze direction effect on the N170 amplitude, as typically observed in TD individuals, diminished with increasing ADOS score. For neutral expressions this correlation was not significant. Experiment 2 required explicit emotion classifications in a facial emotion composite task while eye gaze was manipulated incidentally. A group of 22 children with ASD was compared to a propensity score-matched group of TD children (mean age = 13 years). The same comparison was carried out for a subgroup of nine children with ASD who were less trained in social cognition, according to clinician’s report. The ASD group performed overall worse in emotion recognition than the TD group, independently of emotion or gaze direction. However, for disgust expressions, eye tracking data revealed that TD children fixated relatively longer on the eyes of the stimulus face with a direct gaze as compared with averted gaze. In children with ASD we observed no such modulation of fixation behavior as a function of gaze direction. Overall, the present findings from ERPs and eye tracking confirm the hypothesis of an impaired sensitivity to gaze direction in children with ASD or elevated autistic traits, at least for specific emotions. Therefore, we conclude that multimodal investigations of the interaction between emotional processing and stimulus gaze direction are promising to understand the characteristics of individuals differing along the autism trait dimension.
    Content: Peer Reviewed
    In: Lausanne : Frontiers Research Foundation, 16
    Language: English
    URL: Volltext  (kostenfrei)
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  • 6
    UID:
    edochu_18452_23755
    Format: 1 Online-Ressource (5 Seiten)
    ISSN: 1433-7851 , 1433-7851
    Content: S=2 oxoiron(IV) species act as reactive intermediates in the catalytic cycle of nonheme iron oxygenases. The few available synthetic S=2 FeIV=O complexes known to date are often limited to trigonal bipyramidal and very rarely to octahedral geometries. Herein we describe the generation and characterization of an S=2 pseudotetrahedral FeIV=O complex 2 supported by the sterically demanding 1,4,7-tri-tert-butyl-1,4,7-triazacyclononane ligand. Complex 2 is a very potent oxidant in hydrogen atom abstraction (HAA) reactions with large non-classical deuterium kinetic isotope effects, suggesting hydrogen tunneling contributions. For sterically encumbered substrates, direct HAA is impeded and an alternative oxidative asynchronous proton-coupled electron transfer mechanism prevails, which is unique within the nonheme oxoiron community. The high reactivity and the similar spectroscopic parameters make 2 one of the best electronic and functional models for a biological oxoiron(IV) intermediate of taurine dioxygenase (TauD-J).
    Content: Peer Reviewed
    In: Weinheim : Wiley-VCH, 60,12, Seiten 6752-6756, 1433-7851
    Language: English
    URL: Volltext  (kostenfrei)
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  • 7
    UID:
    edochu_18452_25540
    Format: 1 Online-Ressource (17 Seiten)
    Content: Recent empirical evidence reveals that creative idea generation builds upon an interplay of multiple neural networks. Measures of temporal complexity yield important information about the underlying mechanisms of these co-activated neural networks. A few neurophysiological studies investigated brain signal complexity (BSC) during the production of creative verbal associations and resting states, aiming to relate it with creative task performance. However, it is unknown whether the complexity of brain signals can distinguish between productions of typical and original verbal associations. In the present study, we investigated verbal creativity with multiscale entropy (MSE) of electroencephalography (EEG) signals, which quantifies complexity over multiple timescales, capturing unique dynamic features of neural networks. MSE was measured in verbal divergent thinking (DT) states while emphasizing on producing either typical verbal associations or original verbal associations. We hypothesized that MSE differentiates between brain states characterizing the production of typical and original associations and is a sensitive neural marker of individual differences in producing original associations. Results from a sample of N = 92 young adults revealed slightly higher average MSE for original as compared with typical association production in small and medium timescales at frontal electrodes and slightly higher average MSE for typical association production in higher timescales at parietal electrodes. However, measurement models failed to uncover specificity of individual differences as MSE in typical vs. original associations was perfectly correlated. Hence, individuals with higher MSE in original association condition also exhibit higher MSE during the production of typical associations. The difference between typical and original association MSE was not significantly associated with human-rated originality of the verbal associations. In sum, we conclude that MSE is a potential marker of creative verbal association states, but replications and extensions are needed, especially with respect to the brain-behavior relationships.
    Content: Peer Reviewed
    In: Lausanne : Frontiers, 14
    Language: English
    URL: Volltext  (kostenfrei)
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  • 8
    UID:
    edochu_18452_25367
    Format: 1 Online-Ressource (8 Seiten)
    Content: CuI/TEMPO-Katalysatorsysteme (TEMPO=2,2,6,6-Tetramethylpiperidinoxyl) sind vielseitige Katalysatoren für aerobe Alkoholoxidationsreaktionen zur selektiven Synthese von Aldehyden. Jedoch sind mehrere Aspekte des Reaktionsmechanismus noch nicht aufgeklärt, was hauptsächlich daran liegt, dass bisher keine reaktiven Intermediate identifiziert werden konnten. Wir zeigen hier die Synthese und Charakterisierung eines dinuklearen Komplexes [L12Cu2]2+ (1), der in Gegenwart von TEMPO die katalytische 4 H+/4 e− Reduktion von O2 zu Wasser an die Oxidation von benzylischen und aliphatischen Alkoholen koppeln kann. Die Mechanismen der katalytischen O2-Reduktion und der Alkoholoxidation wurden sowohl durch spektroskopische Detektion der reaktiven Intermediate in der Gas- und der kondensierten Phase als auch durch kinetische Studien an jedem Reaktionsschritt in den Katalysezyklen aufgeklärt. Die intermediären Bis(μ-oxido)dikupfer(III)- (2) und Bis(μ-hydroxido)dikupfer(II)-Spezies (3) wurden als wichtige Reaktanden in beiden Reaktionen identifiziert. Die vorliegende Studie ermöglicht tiefgehende mechanistische Einblicke in die aerobe Alkoholoxidation, die eine wertvolle Grundlage bieten um übergangsmetallkatalysierte Reaktionen mit redoxaktiven Cokatalysatoren besser zu verstehen.
    Content: Peer Reviewed
    In: Weinheim : Wiley-VCH, 133,42, Seiten 23201-23208
    Language: German
    URL: Volltext  (kostenfrei)
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  • 9
    UID:
    edochu_18452_26601
    Format: 1 Online-Ressource (8 Seiten)
    Content: Copper nitrenes are proposed as reactive intermediates in a number of copper mediated aziridination and amination reactions. However, the isolation and characterization of such intermediates have proved challenging because of their transient nature. One successful approach for the stabilization of the copper-nitrene cores is the employment of a redox innocent Lewis acid (LA) like Sc3+. We herein report the stabilization of two transient copper nitrene species 3 and 4 in the absence of LAs by employing electronegative −CF3 and −NO2 groups in the nitrene substituent. Detailed investigations of the spectroscopic properties of 3 and 4 by theoretical and experimental methods, and a comparison of their reactivities in presence and absence of LAs provide some vital insights into the effect of LAs on the geometric and electronic structures of the copper nitrenes.
    In: Weinheim : Wiley-VCH, 647,14, Seiten 1495-1502
    Language: English
    URL: Volltext  (kostenfrei)
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  • 10
    UID:
    edochu_18452_28655
    Format: 1 Online-Ressource (20 Seiten)
    Content: Rhodopsins had long been considered non-fluorescent until a peculiar voltage-sensitive fluorescence was reported for archaerhodopsin-3 (Arch3) derivatives. These proteins named QuasArs have been used for imaging membrane voltage changes in cell cultures and small animals. However due to the low fluorescence intensity, these constructs require use of much higher light intensity than other optogenetic tools. To develop the next generation of sensors, it is indispensable to first understand the molecular basis of the fluorescence and its modulation by the membrane voltage. Based on spectroscopic studies of fluorescent Arch3 derivatives, we propose a unique photo-reaction scheme with extended excited-state lifetimes and inefficient photoisomerization. Molecular dynamics simulations of Arch3, of the Arch3 fluorescent derivative Archon1, and of several its mutants have revealed different voltage-dependent changes of the hydrogen-bonding networks including the protonated retinal Schiff-base and adjacent residues. Experimental observations suggest that under negative voltage, these changes modulate retinal Schiff base deprotonation and promote a decrease in the populations of fluorescent species. Finally, we identified molecular constraints that further improve fluorescence quantum yield and voltage sensitivity.
    Content: Peer Reviewed
    In: [London] : Nature Publishing Group UK, 13,1
    Language: English
    URL: Volltext  (kostenfrei)
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