Distributed Feed-forward Psychoacoustic Control

An apparatus comprising distributed feedforward-circuitry that uses environmental information as a feedforward variable for providing a music stimulus to be listened to by a subject to urge said subject to achieve a target state of consciousness, said distributed feedforward-circuitry comprising

• an environmental-information source that provides said environmental information and
• remote circuitry that is remote from said environmental-information source, said remote circuitry being configured to receive said environmental information from said environmental-information source, said remote circuitry comprising
• a machine-learning system,
• a target-feature set, and
• a controller,
• wherein said machine-learning system has been trained to correlate environmental information and psychoacoustic features with mental state,
• wherein said target feature set, which is generated by said machine-learning system, comprises at least one psychoacoustic feature that is to be included in a music stimulus that is to be provided to said subject, and
• wherein said controller is configured to cause formation of said music stimulus so as to includes said psychoacoustic feature.