The invention relates to a field of medicine and medical devices. An apparatus for registration of transitions between psychophysiological states of individual comprising a reading unit arranged to be capable of measuring an electromotive force under direct electric current of 0.5 to 5.0 microampere to produce a signal at least two electrodes connected to reading unit, electrodes arranged to be capable of fixing upon the body of individual a logarithmic unit, quantization unit comprising a comparator arranged to be capable of determining of whether the difference between the current and the previous signal value is greater than N, where N is a predefined value from 0.1 to 2.0 centineper and a pulse generator arranged to be capable of generating a pulse having an amplitude of N when the difference between the current and the previous signal value is greater than N the apparatus further comprising a compensating unit, a processing unit capable of monitoring the pulse values and at least one power supply. A method for registration of psychophysiological state transition of individual comprises the following steps: (a) measuring of electromotive force between electrodes fixed upon the skin of individual under flow of direct current in interval from 0.5 to 5.0 microampere (b) logarithming of signal (c) quantizing the logarithm of signal from step (b) by level from 0.1 to 2.0 centineper and (d) determining a transition between psychophysiological state of the individual either by registering sudden increase of unidirectional signal pulses amount, or by registering a shift in signal level up to 1.5-3.0 fold as compared to initial value.Linvention concerne le domaine de la médecine et des dispositifs médicaux. Linvention porte sur un appareil pour lenregistrement de transitions entre des états psychophysiologiques dun individu, comprenant une unité de lecture agencée pour être capable de mesurer une force électromotrice sous un courant électrique direct de 0,5 à 5,0 microam
