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144 results on '"Sladky R"'

3. EMOTION PROCESSING TASK AS A NEW STRATEGY FOR LOCATING INDIVIDUALIZED TMS TARGETS

Author

Vasileiadi, Maria, Tik, Martin, Kranz, G., Rütgen, M., Princic, M., Vanicek, T., Pfabigan, D.M., Hahn, A., Sladky, R., Lanzenberger, R., Lamm, C., Windischberger, C., Vasileiadi, Maria, Tik, Martin, Kranz, G., Rütgen, M., Princic, M., Vanicek, T., Pfabigan, D.M., Hahn, A., Sladky, R., Lanzenberger, R., Lamm, C., and Windischberger, C.

Published
2022

7. No time for drifting: Comparing performance and applicability of signal detrending algorithms for real-time fMRI

Author

Kopel, R, Sladky, R, Laub, P, Koush, Y, Robineau, F, Hutton, C, Weiskopf, N, Vuilleumier, P, Van De Ville, D, Scharnowski, Frank; https://orcid.org/0000-0002-9973-2521, Kopel, R, Sladky, R, Laub, P, Koush, Y, Robineau, F, Hutton, C, Weiskopf, N, Vuilleumier, P, Van De Ville, D, and Scharnowski, Frank; https://orcid.org/0000-0002-9973-2521

Abstract

As a consequence of recent technological advances in the field of functional magnetic resonance imaging (fMRI), results can now be made available in real-time. This allows for novel applications such as online quality assurance of the acquisition, intra-operative fMRI, brain-computer-interfaces, and neurofeedback. To that aim, signal processing algorithms for real-time fMRI must reliably correct signal contaminations due to physiological noise, head motion, and scanner drift. The aim of this study was to compare performance of the commonly used online detrending algorithms exponential moving average (EMA), incremental general linear model (iGLM) and sliding window iGLM (iGLMwindow). For comparison, we also included offline detrending algorithms (i.e., MATLAB's and SPM8's native detrending functions). Additionally, we optimized the EMA control parameter, by assessing the algorithm's performance on a simulated data set with an exhaustive set of realistic experimental design parameters. First, we optimized the free parameters of the online and offline detrending algorithms. Next, using simulated data, we systematically compared the performance of the algorithms with respect to varying levels of Gaussian and colored noise, linear and non-linear drifts, spikes, and step function artifacts. Additionally, using in vivo data from an actual rt-fMRI experiment, we validated our results in a post hoc offline comparison of the different detrending algorithms. Quantitative measures show that all algorithms perform well, even though they are differently affected by the different artifact types. The iGLM approach outperforms the other online algorithms and achieves online detrending performance that is as good as that of offline procedures. These results may guide developers and users of real-time fMRI analyses tools to best account for the problem of signal drifts in real-time fMRI.

Published
2019

10. Gender transition affects neural correlates of empathy : A resting state functional connectivity study with ultra high-field 7T MR imaging

Author

Spies, M, Hahn, A, Kranz, G S, Sladky, R, Kaufmann, U, Hummer, A, Ganger, S, Kraus, C, Winkler, D, Seiger, R, Comasco, Erika, Windischberger, C, Kasper, S, Lanzenberger, R, Spies, M, Hahn, A, Kranz, G S, Sladky, R, Kaufmann, U, Hummer, A, Ganger, S, Kraus, C, Winkler, D, Seiger, R, Comasco, Erika, Windischberger, C, Kasper, S, and Lanzenberger, R

Abstract

Sex-steroid hormones have repeatedly been shown to influence empathy, which is in turn reflected in resting state functional connectivity (rsFC). Cross-sex hormone treatment in transgender individuals provides the opportunity to examine changes to rsFC over gender transition. We aimed to investigate whether sex-steroid hormones influence rsFC patterns related to unique aspects of empathy, namely emotion recognition and description as well as emotional contagion. RsFC data was acquired with 7Tesla magnetic resonance imaging in 24 male-to-female (MtF) and 33 female-to-male (FtM) transgender individuals before treatment, in addition to 33 male- and 44 female controls. Of the transgender participants, 15 MtF and 20 FtM were additionally assessed after four weeks and four months of treatment. Empathy scores were acquired at the same time-points. MtF differed at baseline from all other groups and assimilated over the course of gender transition in a rsFC network around the supramarginal gyrus, a region central to interpersonal emotion processing. While changes to sex-steroid hormones did not correlate with rsFC in this network, a sex hormone independent association between empathy scores and rsFC was found. Our results underline that 1) MtF transgender persons demonstrate unique rsFC patterns in a network related to empathy and 2) changes within this network over gender transition are likely related to changes in emotion recognition, -description, and -contagion, and are sex-steroid hormone independent.

Published
2016
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15. P.1.e.015 Neuronal plasticity of language-related brain regions induced by long-term testosterone treatment

Author

Hahn, A., primary, Kranz, G., additional, Sladky, R., additional, Kaufmann, U., additional, Ganger, S., additional, Hummer, A., additional, Seiger, R., additional, Spies, M., additional, Vanicek, T., additional, Winkler, D., additional, Kasper, S., additional, Windischberger, C., additional, Swaab, D., additional, and Lanzenberger, R., additional

Published
2015
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33. Surface-Finish Measurement with Interference Microscopes

Author

UNION CARBIDE CORP OAK RIDGE TN Y-12 PLANT, Sladky, R. E., UNION CARBIDE CORP OAK RIDGE TN Y-12 PLANT, and Sladky, R. E.

Abstract

Diamond turning copper and other metals, to produce mirror surfaces with reflectivities generally higher than can be obtained by lapping and polishing, has become an important new technology. Evaluation of the finish of these surfaces requires careful examination, using optical instruments. This document provides background information about the theory and equipment involved in this program. Data from several specimens have been acquired that show the type of surface finish that is obtained. Mirrors have been fabricated that show the state of the art that has been achieved in diamond turning copper and nickel.

Published
1977

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