Controlling an influence on a user in a rendering environment

A method of controlling an influence on a user (14) in a rendering environment comprises: obtaining signal data (16) representing one or more physiological conditions of a user (14) in response to an influence caused by system feedback (13) of the rendering environment; obtaining data corresponding to a user's desired emotional state (19,20; 32-36), which data is based on the user's self-reports and data representative of accompanying signal data (16) representing one or more physiological conditions of the user (14) over a last period before the accompanying self-report; - determining whether the desired emotional state (19,20; 32-36) is reached; and if the state (19,20; 32-36) is not reached, adapting the system feedback (16) provided by the rendering environment correspondingly.