Charles H. Bachman

Effect of Magnetic Fields on Reaction Time Performance

IN previous investigations1,2 we indicated some significant empirical relationships between selected geophysical parameters and gross measures of human behaviour. The present investigation attempts to demonstrate the effects of artificially produced magnetic fields on a standard, relatively uncomplicated, psychomotor task, simple reaction time.

The Graded Boundary Carbon-Saline Electrode

A new type of electrode for measurement of dc potentials is described. Utilizing a porous graded boundary of carbon on fiber-glass wet with saline, this electrode makes possible highly drift free operation over long periods. With matched pairs of electrodes, base line drifts of less than 1 mv per hour are obtained. Examples of its use in measuring body potentials are given. The voltage-current characteristic shows a useful working region in which the electrode potential is independent of the current.