Abstract
It was discussed that the so-called biological potentials are always recorded by elucidating some magnitude of current which biological tissue generates. Larger necessary current for the record needs better non-polarizable electrode and lower resistance.
If the biological potential is of short duration, e. g. nerve fiber action potential, use of non-polarizable electrode is not always necessary. In this case, however, better record can be expected if the polarization effect is minimized by smaller current passing through the electrode. This condition is attained by the high input resistance amplifier.
It was also discussed that smaller size of the recording electrode can result in larger potential and that easier access to the tissue can be attained by the development of some convenient types of polarizable recording electrodes.
It was mentioned that electrodes of high resistance frequently have troubles of noises and other interferences which are difficult to decrease. It is also possible that slightest movement of the leading wire can be the source of artefacts in the records. These and other unidentified deflection often could be minimized by the use of low noise wire with graphite sheath.
