Institut für Theoretische Physik
Start / Aktuell
März  2015
Di
03.03.2015
Ludwig Prandtl Lecture Hall AI Building, Am Faßberg 11, 37077 Göttingen
Nichtlineare Dynamik
17:15
AG-Seminar: MPI für Dynamik und Selbstorganisation - Bernstein Center for Computational Neuroscience/ Bernstein Focus Neurotechnology

Prof. Dr. Ricarda Schubotz
Westfälische Wilhelms-Universität, Institute of Psychology, Münster

Predicting action: bottom-up and top-down

We are living in an ever-changing environment and mostly have to adapt to more or less predictable variation. How can we do so? Our concept of what perception is and in which way it differs from action has changed fundamentally with the advent and proliferation of imaging methods applied on brain function. This innovation has revitalized the control-theoretically inspired notion of the brain as a predictive machine implementing internal models of sensory change. According to the most recent and radical reading, perceptual representation amounts to what is generated in a top-down feedback fashion, whereas sensory feedforward streams provide nothing but prediction errors. The mismatch between both is information in the proper sense. Currently, however, sophisticated concepts on predictive perception run ahead of our understanding of how the brain exploits environmental cues to feed predictions and how dynamic prediction is organized in time. A series of experiments is reported that hopes to contribute to three issues in this area: (a) the core-network of sensorimotor prediction, (b) the exploitation of environmental cues that drive predictions, and (c) the adjustments of predictions based on probability structures. Findings point to a complex but generic set of networks underlying predictions in the seconds range and beyond.

Mi
04.03.2015
Seminarraum Astrophysik (SR 17, F 05.104)
SFB 963
16:15
SFB 963 Seminar

Prof. Isabel Baraffe
University of Exeter, School of Physics

On the front of exoplanet modelling: atmospheres, interior structures and evolution of (exo)planets

This review will present current models describing the internal structure and evolution of planets covering a wide range of masses, from terrestrial to giant planets. I will discuss the impact of new equations of state on interior structures and bulk composition determination. I will present some important dynamical processes which strongly impact the interior and evolutionary properties of planets (e.g semiconvection) and describe non standard models recently suggested for the solar system giant planets. The case of short-period, strongly irradiated exoplanets will also be examined with a critical analysis of some of the physical mechanisms which have been suggested to explain their anomalously large radius. I will also briefly mention remaining uncertainties in stellar models which affect the characterisation of planetary systems (for example age determination).

Kontakt: W. Schmidt

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