Does it matter what is trained? A randomized controlled trial evaluating the specificity of alpha/delta ratio neurofeedback in reducing tinnitus symptoms.

Previous studies showed that alpha/delta ratio neurofeedback was effective in reducing unpleasant psychological, emotional and perceptual consequences of tinnitus. The main goal of the present study was to investigate, whether the specific combination of enhancing alpha frequency band activity and reducing delta frequency band activity was necessary, or merely sufficient, to obtain a positive treatment outcome regarding tinnitus distress and intensity. A second research aim was to assess the relative contribution of neurofeedback-related non-specific and general non-specific effects in neurofeedback treatment.

Disentangling the Impact of Point Defect Density and Carrier Localization-Enhanced Auger Recombination on Efficiency Droop in (In,Ga)N/GaN Quantum Wells.

The internal quantum efficiency of (In,Ga)N/GaN quantum wells can surpass 90% for blue-emitting structures at moderate drive current densities but decreases significantly for longer emission wavelengths and at higher excitation rates. This latter effect is known as efficiency "droop" and limits the brightness of light-emitting diodes (LEDs) based on such quantum wells. Several mechanisms have been proposed to explain efficiency droop including Auger recombination, both intrinsic and defect-assisted, carrier escape, and the saturation of localized states.

Leadership During Crisis: An Examination of Supervisory Leadership Behavior and Gender During COVID-19.

Due to major work disruptions caused by the coronavirus (COVID-19) pandemic, supervisors in organizations are facing leadership challenges as they attempt to manage "work from home" arrangements, the health and safety of essential workers, and workforce reductions. Accordingly, the present research seeks to understand what types of leadership employees think is most important for supervisors to exhibit when managing these crisis-related contexts and, in light of assertions that women may be better leaders during times of crisis, examines gender differences in how male and female supervisors act and how subordinates perceive and evaluate them in real (Study 1) and hypothetical (Study 2) settings. Results indicate that communal leader behaviors were more important to employees in all three crisis contexts.

Ultrafast neuromorphic photonic image processing with a VCSEL neuron.

The ever-increasing demand for artificial intelligence (AI) systems is underlining a significant requirement for new, AI-optimised hardware. Neuromorphic (brain-like) processors are one highly-promising solution, with photonic-enabled realizations receiving increasing attention. Among these, approaches based upon vertical cavity surface emitting lasers (VCSELs) are attracting interest given their favourable attributes and mature technology.

Heterostructure and -factor engineering for low-threshold and persistent nanowire lasing.

Continuous room temperature nanowire lasing from silicon-integrated optoelectronic elements requires careful optimisation of both the lasing cavity -factor and population inversion conditions. We apply time-gated optical interferometry to the lasing emission from high-quality GaAsP/GaAs quantum well nanowire laser structures, revealing high -factors of 1250 ± 90 corresponding to end-facet reflectivities of  = 0.73 ± 0.