Andreas Heckel

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Visual illusions are valuable tools for the scientific examination of the mechanisms underlying perception. In the peripheral drift illusion special drift patterns appear to move although they are static. During fixation small involuntary eye movements generate retinal image slips which need to be suppressed for stable perception. Here we show that the(More)
BACKGROUND Recent preclinical work strongly suggests that vagus nerve stimulation efficiently modulates nociception and pain processing in humans. Most recently, a medical device has offered a transcutaneous electrical stimulation of the auricular branch of the vagus nerve (t-VNS) without any surgery. OBJECTIVE Our study investigates whether t-VNS may(More)
A land surface broadband albedo map of the entire Earth's land surface (snow and snow-free) is required for use in Global Climate Model initialisation and verification. A group of 10 users have been selected to work with the GlobAlbedo* Implementation team to define requirements and drive the project towards practical applications of the product. These(More)
A network of ground-based UV/visible DOAS instruments operated by the University of Bremen is used to validate total column measurements from the SCIAMACHY instrument on ENVISAT from the tropics to the Arctic. Measurement quantities include vertical columns of O 3 , NO 2 , and BrO. Depending on atmospheric conditions, also slant columns of OClO (during(More)
PURPOSE To investigate the ability of diffusion-tensor imaging (DTI) and T2 to help detect the mildest nerve lesion conceivable, that is, subclinical ulnar neuropathy at the elbow. MATERIALS AND METHODS This prospective study was approved by the institutional ethics board. Written informed consent was obtained from all participants. Magnetic resonance(More)
The MERIS and AATSR instruments onboard ENVISAT provide similar resolution and swath but complementary information, encompassing different spectral domains and viewing geometries. We present research on synergistic use of MERIS and AATSR imagery, with objectives (i) to define and evaluate algorithms for improved cloud screening, global aerosol retrieval and(More)
Producing a global and comprehensive description of atmospheric aerosols requires integration of ground-based, airborne, satellite and model datasets. Due to its complexity, aerosol monitoring requires the use of several data records with complementary information content. This paper describes the lessons learned while developing and qualifying algorithms(More)
Recent evidence points to an overlap in the neural systems processing pain and social distress. In this functional MRI study we focus on the possible interplay between the processing of a psychosocial stressor and somatic pain within pain responsive brain regions, the latter being identified in an independent localizer experiment. A paradigm based on(More)