[Technic for the cancellation of power-line noise in biomagnetic measurements].
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Biomedical Engineering↗
Biomedical subjects
S Kuriki
Publications and source records attributed to S Kuriki.
Neuromagnetic responses elicited by auditory stimuli in dichotic listening.
We measured N1m and P2m components of the magnetic field responses that were elicited by random series of a tone burst given to the left ear and a monosyllabic speech sound given to the right ear. The magnetic responses had smaller amplitudes and/or longer peak latencies of the N1m and the P2m when the stimulus was preceded by a stimulus at the same ear than when preceded by a stimulus at the different ear. This reduction of the response by preceding stimulation of the same ear was significant over the hemisphere contralateral, but not ipsilateral, to the ear stimulated. The peak latencies of N1m and P2m were significantly longer in the response over the hemisphere contralateral than ipsilateral to the stimulated ear.
Acoustic Stimulation↗
Dependence of electrical conductivity on fixed charge density in articular cartilage.
A new system for measuring the resistivity of articular cartilage is based on the four-point probe technique. The system measures resistivity as a function of depth from the articular surface. The measurements obtained showed that the conductivity, kappa, of articular cartilage equilibrated in Ringer's solution (pH, 7.4) is constant in all zones, with a value of 6-10 X 10(-3) mho/cm. Conversely, kappa of articular cartilage equilibrated in distilled water varies distinctly, being low in the superficial zone (about 0.7 X 10(-3) mho/cm) and high in the middle to deep zone (about 3 X 10(-3) mho/cm). This is almost the same variation shown by the fixed charge density, FCD, which was measured by the tracer cation method; a linear correlation between kappa and the FCD was found (correlation coefficient, 0.88). These observations were well understood based on the Donnan equilibrium; the mobility of Na+ in cartilage was thought to be independent of FCD.
Cartilage, Articular↗