Methods and devices can enhance language processing in an autism spectrum disorder (ASD) individual through auditory manipulation of an auditory stream. The auditory stream is received and includes an acoustic stimulus perceptually representing an object. An acoustic manipulation parameter for a predetermined acoustic detail characteristic is selected. The predetermined acoustic detail characteristic is associated with the ASD individual and is based on a measured language processing capability of the ASD individual. The auditory stream is modified based on the selected parameter, to reduce the predetermined acoustic detail characteristic while preserving a lexicality of the stimulus, such that the reduced acoustic detail characteristic enhances perception of the object by the ASD individual even when the stimulus includes two or more acoustically distinct stimuli each perceptually representing the object. The modified auditory stream is output to the ASD individual via at least one loudspeaker.