An investigation is made of the effects of nongyrotropic equilibrium distributions in the phase angle of pj on the stability properties of a relativistic electron beam propagating along and gyrating about an applied uniform magnetic field. Perturbations are assumed to vary spatially only in the direction of the applied magnetic field, so that generated electromagnetic and longitudinal electric ...

Neural mechanisms of extraclassical receptive field phenomena in V1 are commonly assumed to result from long-range lateral connections and/or extras-triate feedback. We address two such phenomena: surround suppression and contrast dependent receptive field size. We present rigorous computational support for the hypothesis that the phenomena largely result from local short-range (< 0.5 mm) corti...

Neural mechanisms of extraclassical receptive field phenomena in V1 are commonly assumed to result from long-range lateral connections and/or extras-triate feedback. We address two such phenomena: surround suppression and contrast dependent receptive field size. We present rigorous computational support for the hypothesis that the phenomena largely result from local short-range (< 0.5 mm) corti...

Receptive elds (RFs) in V1 were found to be wider during synchronized than during non-synchronized EEG states, where, in addition, they can sharpen over time. These changes were suggested to be mainly driven by state-dependent LGN-ring patterns. Here we employ a neural eld approach to analytically describe the changing cortical RFs. For pure feedforward networks expressions for spatio-temporal ...