Unsuitability of 157Tb for light-neutrino rest-mass studies.
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Journal Article↗
Biomedical subjects
R Gunnink
Publications and source records attributed to R Gunnink.
Spatial frequency evoked visuograms in multiple sclerosis.
We obtained steady-state visual evoked potentials (VEPs) to sinusoidal gratings alternating at 4 Hz with spatial frequencies varying from 0.5 to 8 cpd in 21 normal controls and 21 patients with multiple sclerosis (MS), and analyzed responses by fast Fourier transform. Amplitude- and phase-spatial frequency functions were obtained and referred to as amplitude and phase "visuograms." We observed two types of abnormalities in the phase visuograms of MS patients: (1) abnormal responses at all spatial frequencies tested (37%), and (2) abnormal responses only at selective spatial frequencies (52%). Some patients had phase lag limited to low, middle, or high spatial frequencies. Steady-state and transient VEPs to 2 and 4 cpd showed a similar percent of abnormalities. The use of more than one spatial frequency stimulus increased the diagnostic yield by 17%. Our data confirm that MS may selectively affect specific neuronal channels within the visual pathways.
Adolescent↗
Determination of the absolute K through O conversion coefficients of the 80-keV M4 transition in 193Irm.
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Journal Article↗