5 research outputs found
Infrared light extinction by charged dielectric core-coat particles
We study the effect of surplus electrons on the infrared extinction of
dielectric particles with a core-coat structure and propose to use it for an
optical measurement of the particle charge in a dusty plasma. The particles
consist of an inner core with negative and an outer coat with positive electron
affinity. Both the core and the coat give rise to strong transverse optical
phonon resonances, leading to anomalous light scattering in the infrared. Due
to the radial profile of the electron affinity electrons accumulate in the coat
region making the infrared extinction of this type of particles very
charge-sensitive, in particular, the extinction due to a resonance arising
solely due to the core-coat structure. The maximum of this resonance is in the
far-infrared and responds to particle charges realizable in ordinary dusty
laboratory plasmas.Comment: 12 pages, 8 figure
A causal account of the brain network computations underlying strategic social behavior
During competitive interactions, humans have to estimate the impact of their own actions on their opponent's strategy. Here we provide evidence that neural computations in the right temporoparietal junction (rTPJ) and interconnected structures are causally involved in this process. By combining inhibitory continuous theta-burst transcranial magnetic stimulation with model-based functional MRI, we show that disrupting neural excitability in the rTPJ reduces behavioral and neural indices of mentalizing-related computations, as well as functional connectivity of the rTPJ with ventral and dorsal parts of the medial prefrontal cortex. These results provide a causal demonstration that neural computations instantiated in the rTPJ are neurobiological prerequisites for the ability to integrate opponent beliefs into strategic choice, through system-level interaction within the valuation and mentalizing networks