A method for characterizing an olfactory stimulation, the method comprising: • a plurality of first visual stimulation steps, each first visual stimulation step consisting in carrying out a visual stimulation, each visual stimulation being associated with at least one identified theme; • a plurality of first steps of recording values of physiological variables, each first recording step being carried out continuously during a first visual stimulation step among the plurality of first visual stimulation steps, so as to obtain a first physiological recording, the plurality of steps of recording values of physiological variables thus resulting in obtaining a plurality of first physiological recordings, each first physiological recording being associated with an identified theme corresponding to the identified theme associated with the first visual stimulation step; • a second olfactory stimulation step, the second olfactory stimulation step consisting in carrying out an olfactory stimulation; • a second step of recording values of physiological variables, the second step of recording values of physiological variables being carried out continuously during and after the second olfactory stimulation step thus resulting in obtaining a second physiological recording; and characterized by • a comparison step, the comparison step consisting in comparing the first physiological recordings with the second physiological recording, so as to isolate at least one first physiological recording, said at least one first isolated physiological recording being close to the second physiological recording; and • a determination step, the determination step consisting in determining at least one identified theme, the identified theme being the identified theme associated with the at least one first visual stimulation step isolated during the comparison step. • a plurality of first visual stimulation steps, each first visual stimulation step consisting in carrying out a visual stimulation, each visual stimulation being associated with at least one identified theme; • a plurality of first steps of recording values of physiological variables, each first recording step being carried out continuously during a first visual stimulation step among the plurality of first visual stimulation steps, so as to obtain a first physiological recording, the plurality of steps of recording values of physiological variables thus resulting in obtaining a plurality of first physiological recordings, each first physiological recording being associated with an identified theme corresponding to the identified theme associated with the first visual stimulation step; • a second olfactory stimulation step, the second olfactory stimulation step consisting in carrying out an olfactory stimulation; • a second step of recording values of physiological variables, the second step of recording values of physiological variables being carried out continuously during and after the second olfactory stimulation step thus resulting in obtaining a second physiological recording; and characterized by • a comparison step, the comparison step consisting in comparing the first physiological recordings with the second physiological recording, so as to isolate at least one first physiological recording, said at least one first isolated physiological recording being close to the second physiological recording; and • a determination step, the determination step consisting in determining at least one identified theme, the identified theme being the identified theme associated with the at least one first visual stimulation step isolated during the comparison step.