A method for selecting a transmission direction in a binaural hearing aid system comprising two hearing aids (2, 3; 35, 40), the method comprising at a first hearing aid (2, 35), picking up a sound signal by one or more input transducers of the first hearing aid; at a second hearing aid (3, 40), picking up the sound signal by one or more input transducers of the second hearing aid; at the first hearing aid (2, 35), determining a first quantity characterizing the presence of usable information content in the sound signal picked up by the one or more input transducers of the first hearing aid (2, 35); at the second hearing aid (3, 40), determining a second quantity characterizing the presence of usable information content in the sound signal picked up by the one or more input transducers of the second hearing aid (3, 40), the second quantity being comparable to the first quantity; transmitting the first quantity to the second hearing aid (3, 40) and/or transmitting the second quantity to the first hearing aid (2, 35); at the first hearing aid (2, 35) and/or second hearing aid (3, 40), comparing the first quantity with the second quantity; and based on the determined first quantity and/ or second quantity and/ or the compared first quantity with the second quantity, determining the transmission direction for transmitting audio information between the first hearing aid (2, 35) and the second hearing aid (3, 40), wherein the transmission of the audio information is unidirectional within a time slot starting from picking of the sound signal at the first hearing aid (2, 35) and second hearing aid (3, 40) until producing the synchronized outputs, the direction of unidirectional transmission being dependent upon the first quantity and/or the second quantity satisfying predetermined criteria. at a first hearing aid (2, 35), picking up a sound signal by one or more input transducers of the first hearing aid; at a second hearing aid (3, 40), picking up the sound signal by one or more input transducers of the second hearing aid; at the first hearing aid (2, 35), determining a first quantity characterizing the presence of usable information content in the sound signal picked up by the one or more input transducers of the first hearing aid (2, 35); at the second hearing aid (3, 40), determining a second quantity characterizing the presence of usable information content in the sound signal picked up by the one or more input transducers of the second hearing aid (3, 40), the second quantity being comparable to the first quantity; transmitting the first quantity to the second hearing aid (3, 40) and/or transmitting the second quantity to the first hearing aid (2, 35); at the first hearing aid (2, 35) and/or second hearing aid (3, 40), comparing the first quantity with the second quantity; and based on the determined first quantity and/ or second quantity and/ or the compared first quantity with the second quantity, determining the transmission direction for transmitting audio information between the first hearing aid (2, 35) and the second hearing aid (3, 40), wherein the transmission of the audio information is unidirectional within a time slot starting from picking of the sound signal at the first hearing aid (2, 35) and second hearing aid (3, 40) until producing the synchronized outputs, the direction of unidirectional transmission being dependent upon the first quantity and/or the second quantity satisfying predetermined criteria.