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It is shown that simultaneous pickup of polarographic and electrophysiological signals, which is usually prevented by severe electrical interference, becomes possible when the polarograph is connected to its electrodes via an optoelectronic link. The sources of interference in simultaneous measurements are discussed, as well as the advantage of breaking the ground loop. Experimental data show that the simultaneous signals have the same quality as those detected separately. Simultaneous brain polarography and unitary neuronal activity monitoring are considered.