1. A method for spatially resolved presentation of a change of functional activities in the brain of a living subject under observation by magnetic resonance, comprises the steps of: producing temporally successive magnetic resonance images, each having an excitation angle and an echo time associated therewith, of a living subject stimulated with a stimulus with variation of at least one of the excitation angle and the echo time from image-to-image, each image being composed of pixels; calculating a noise part for each pixel an image referenced to identical pixels of the temporally successive images; resolving the noise part of each pixel into a first noise component independent of the excitation angle and a second noise component dependent on the excitation angle; resolving the second noise component of the noise part of each pixel into a third noise component independent of the echo time and a fourth noise component dependent on the echo time; and employing the fourth noise component of the noise part of each pixel for detecting neural activity changes in the brain of the living subject.