Katharina Braun

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In the forebrain of domestic chicks, a network of distinct regions is crucially involved in auditory and visual filial imprinting. Among these areas, a distinct part of the dorsocaudal neostriatal complex (dNC complex), termed neostriatum dorsocaudale (Ndc), was recently discovered by its enhanced metabolic activity during the presentation of auditory and(More)
The present study provides evidence for the hypothesis that the extent and the direction of experience-induced synaptic changes in cortical areas correlates with time windows of neuronal as well as endocrine development. Repeated brief exposure to maternal separation prior to the stress hyporesponsive period (SHRP) of the hypothalamic-pituitary-adrenal(More)
The influence of early postnatal socio-emotional deprivation on the development of tyrosine hydroxylase- and 5-hydroxytryptamine-immunoreactive fiber innervation in the medial prefrontal cortex was quantitatively investigated in the precocial rodent Octodon degus. Forty-five-days-old degus from two groups were compared: (i) degus which were repeatedly(More)
We tested the effect of weaning at 21 or 30 days, followed by individual or group housing, on explorative and social behavior in adult male and female rats, and in males, on dendritic length and spine density in prefrontal cortex. In the open field, rats weaned early were the most active, while those weaned late and group housed were the most explorative.(More)
In the presence of oxygen many aminoaromatic compounds polymerize to form recalcitrant macromolecules. To circumvent undesirable oxidation reactions, the anaerobic biodegradation of a simple member of this class of compounds was investigated. Two strains of bacteria were isolated which degrade 2-aminobenzoate anaerobically under denitrifying conditions,(More)
In the subcortical auditory system of Rhinolophus rouxi, antibodies directed against the calcium-binding proteins parvalbumin, calbindin D-28k, and calretinin yield partly overlapping and partly complementary labeling patterns which are described in detail for each nucleus. The most general features of the labeling patterns are that: 1) Parvalbumin is a(More)
Analogous to the experience-driven development of sensory systems, the functional maturation of limbic circuits is significantly influenced by early socio-emotional experience. In a combined light and electron microscopic study in the anterior cingulate cortex of Octodon degus, the densities of spine and shaft synapses on apical dendrites of layer III(More)
Fragile-X, the main cause of inherited human mental retardation is associated with the absence of a recently identified fragile-X mental retardation protein (FMRP). Mice in which this protein is lacking due to a knockout (KO) mutation are reported to express altered dendritic spines on their cortical neurons compared with wild type (WT) controls. We have(More)
Both chronic stress in adulthood and episodes of stress in the early postnatal period have been shown to interfere with neuronal development in limbic prefrontal cortical regions. The present study in rats showed for the first time that the development of layer II/III pyramidal neurons in the dorsal anterior cingulate (ACd) and orbitofrontal cortex (OFC) is(More)
The auditory and vocal motor systems of adult zebra finches were investigated 1) immunocytochemically for the distribution of the Ca2+-binding protein parvalbumin, 2) for the activity of the respiratory enzyme cytochrome oxidase, and 3) for the uptake of 2-deoxyglucose. All auditory nuclei (field L, nucleus ovoidalis, ansa lenticularis, nucleus spiriformis(More)