A method for operating a hearing system including a hearing instrument that is worn in or at the ear of a user, comprising the following steps: - capturing a sound signal from an environment of the hearing instrument; - processing the captured sound signal in dependence of a set of signal processing parameters (R,S,C,O), and - outputting a processed sound signal to the user; - analyzing the captured sound signal to recognize own-voice intervals, in which the user speaks; - analyzing the captured sound signal for at least one acoustic feature (F,V) of the own voice of the user and/or analyzing a signal of at least one bio sensor, said at least one bio sensor measuring at least one non-acoustic vital function of the user, - determining, from said at least one acoustic feature (F,V) of the own voice of the user and/or the at least one non-acoustic vital function of the user, a measure of an emotional state of the user, - testing the measure of the emotional state with respect to a predefined criterion; and - adapting a value of at least one of said signal processing parameters (R,S,C,O), within said own-voice intervals, to change the emotional state if said criterion is fulfilled, - wherein said criterion comprises a desired value (M 0) of the measure of the emotional state; - wherein the testing comprises determination of a deviation (ΔM) of the measure of the emotional state with respect to said desired value (M 0); and - wherein the value of said at least one of said signal processing parameters (R,S,C,O) is adapted so that said deviation (ΔM) is reduced; characterized in that said at least one signal processing parameter that is adapted includes a parameter of an algorithm adapting the pitch of the captured sound signal including the own voice of the user. - capturing a sound signal from an environment of the hearing instrument; - processing the captured sound signal in dependence of a set of signal processing parameters (R,S,C,O), and - outputting a processed sound signal to the user; - analyzing the captured sound signal to recognize own-voice intervals, in which the user speaks; - analyzing the captured sound signal for at least one acoustic feature (F,V) of the own voice of the user and/or analyzing a signal of at least one bio sensor, said at least one bio sensor measuring at least one non-acoustic vital function of the user, - determining, from said at least one acoustic feature (F,V) of the own voice of the user and/or the at least one non-acoustic vital function of the user, a measure of an emotional state of the user, - testing the measure of the emotional state with respect to a predefined criterion; and - adapting a value of at least one of said signal processing parameters (R,S,C,O), within said own-voice intervals, to change the emotional state if said criterion is fulfilled, - wherein said criterion comprises a desired value (M 0) of the measure of the emotional state; - wherein the testing comprises determination of a deviation (ΔM) of the measure of the emotional state with respect to said desired value (M 0); and - wherein the value of said at least one of said signal processing parameters (R,S,C,O) is adapted so that said deviation (ΔM) is reduced;