A method comprising: obtaining, by a device, a combined sound signal for signals combined from multiple sound sources (SP1-N, Spk1, Spk2) in an area in which a person is located; applying, by the device, neural-network-based speech-separation processing to the combined sound signal from the multiple sound sources to derive a plurality of separated signals (122a-n) that each contains signals corresponding to different groups of the multiple sound sources; obtaining, by the device, neural signals for the person, the neural signals being indicative of one or more of the multiple sound sources the person is attentive to; selecting one of the plurality of separated signals based on the obtained neural signals for the person; and processing the selected one of the plurality of separated derived signals, characterized in that applying the speech-separation processing comprises separating a sound spectrogram representation of the combined signal into multiple resultant speaker spectrograms by feeding the sound spectrogram representation of the combined signal into multiple deep neural networks, DNNs, each of which is trained to separate the sound spectrogram representation into a specific speaker spectrogram for a specific speaker from the multiple speakers, to obtain the multiple speaker spectrograms, and in that selecting the one of the plurality of separated signals comprises comparing, using normalized correlation analysis, a spectrogram of a particular speaker the person is attentive to, reconstructed from the obtained neural signals, to the multiple resultant speaker spectrograms obtained from the multiple DNNs to select one of the multiple resultant speaker spectrograms, and further in that processing the selected one of the plurality of separated derived signals comprises: converting the selected one of the multiple resultant speaker spectrograms into a resultant acoustic waveform; performing one or more of: amplifying the selected one of the plurality of separated signals, or attenuating at least one non-selected signal from the plurality of separated signals; and adding the selected one of the plurality of separated signals to the combined signal. obtaining, by a device, a combined sound signal for signals combined from multiple sound sources (SP1-N, Spk1, Spk2) in an area in which a person is located; applying, by the device, neural-network-based speech-separation processing to the combined sound signal from the multiple sound sources to derive a plurality of separated signals (122a-n) that each contains signals corresponding to different groups of the multiple sound sources; obtaining, by the device, neural signals for the person, the neural signals being indicative of one or more of the multiple sound sources the person is attentive to; selecting one of the plurality of separated signals based on the obtained neural signals for the person; and processing the selected one of the plurality of separated derived signals, characterized in that applying the speech-separation processing comprises separating a sound spectrogram representation of the combined signal into multiple resultant speaker spectrograms by feeding the sound spectrogram representation of the combined signal into multiple deep neural networks, DNNs, each of which is trained to separate the sound spectrogram representation into a specific speaker spectrogram for a specific speaker from the multiple speakers, to obtain the multiple speaker spectrograms, and in that selecting the one of the plurality of separated signals comprises comparing, using normalized correlation analysis, a spectrogram of a particular speaker the person is attentive to, reconstructed from the obtained neural signals, to the multiple resultant speaker spectrograms obtained from the multiple DNNs to select one of the multiple resultant speaker spectrograms, and further in that processing the selected one of the plurality of separated derived signals comprises: converting the selected one of the multiple resultant speaker spectrograms into a resultant acoustic waveform; performing one or more of: amplifying the selected one of the plurality of separated signals, or attenuating at least one non-selected signal from the plurality of separated signals; and adding the selected one of the plurality of separated signals to the combined signal. converting the selected one of the multiple resultant speaker spectrograms into a resultant acoustic waveform; performing one or more of: amplifying the selected one of the plurality of separated signals, or attenuating at least one non-selected signal from the plurality of separated signals; and adding the selected one of the plurality of separated signals to the combined signal.