@article{FelisattiAagtenMurphyLaubrocketal.2020, author = {Felisatti, Arianna and Aagten-Murphy, David and Laubrock, Jochen and Shaki, Samuel and Fischer, Martin H.}, title = {The brain's asymmetric frequency tuning}, series = {Symmetry / Molecular Diversity Preservation International (MDPI)}, volume = {12}, journal = {Symmetry / Molecular Diversity Preservation International (MDPI)}, number = {12}, publisher = {MDPI}, address = {Basel}, issn = {2073-8994}, doi = {10.3390/sym12122083}, pages = {25}, year = {2020}, abstract = {To construct a coherent multi-modal percept, vertebrate brains extract low-level features (such as spatial and temporal frequencies) from incoming sensory signals. However, because frequency processing is lateralized with the right hemisphere favouring low frequencies while the left favours higher frequencies, this introduces asymmetries between the hemispheres. Here, we describe how this lateralization shapes the development of several cognitive domains, ranging from visuo-spatial and numerical cognition to language, social cognition, and even aesthetic appreciation, and leads to the emergence of asymmetries in behaviour. We discuss the neuropsychological and educational implications of these emergent asymmetries and suggest future research approaches.}, language = {en} } @article{WerhahnPfrommerGirichidisetal.2021, author = {Werhahn, Maria and Pfrommer, Christoph and Girichidis, Philipp and Puchwein, Ewald and Pakmor, R{\"u}diger}, title = {Cosmic rays and non-thermal emission in simulated galaxies}, series = {Monthly notices of the Royal Astronomical Society}, volume = {505}, journal = {Monthly notices of the Royal Astronomical Society}, number = {3}, publisher = {Oxford University Press}, address = {Oxford}, issn = {0035-8711}, doi = {10.1093/mnras/stab1324}, pages = {3273 -- 3294}, year = {2021}, abstract = {Current-day cosmic ray (CR) propagation studies use static Milky Way models and fit parametrized source distributions to data. Instead, we use three-dimensional magnetohydrodynamic (MHD) simulations of isolated galaxies with the moving-mesh code arepo that self-consistently accounts for hydrodynamic effects of CR protons. In post-processing, we calculate their steady-state spectra, taking into account all relevant loss processes. We show that this steady-state assumption is well justified in the disc and generally for regions that emit non-thermal radio and gamma rays. Additionally, we model the spectra of primary electrons, accelerated by supernova remnants, and secondary electrons and positrons produced in hadronic CR proton interactions with the gas. We find that proton spectra above 10 GeV only weakly depend on galactic radius, while they acquire a radial dependence at lower energies due to Coulomb interactions. Radiative losses steepen the spectra of primary CR electrons in the central galactic regions, while diffusive losses dominate in the outskirts. Secondary electrons exhibit a steeper spectrum than primaries because they originate from the transported steeper CR proton spectra. Consistent with Voyager-1 and AMS-02 data, our models (i) show a turnover of proton spectra below GeV energies due to Coulomb interactions so that electrons start to dominate the total particle spectra and (ii) match the shape of the positron fraction up to 10 GeV. We conclude that our steady-state CR modelling in MHD CR galaxy simulations is sufficiently realistic to capture the dominant transport effects shaping their spectra, arguing for a full MHD treatment to accurately model CR transport in the future.}, language = {en} }