A mixed reality system for treating or supplementing treatment of a subject with mental or developmental conditions, comprising a database comprising indications of a selected treatment for an identified condition of a subject, stimulatory devices that provide visual, auditory, olfactory and/or haptic stimulation, a processor to process information related to the indications, a controller controlling operation of the stimulatory devices to provide a first set of stimulatory content to the subject, sensors being configured to generate sensory data in response to the first set wherein the sensory data is indicative of a current state of the subject and is used to assess the current state in relation to a state threshold. In response to the current state being assessed as greater than a state threshold, the stimulatory devices to provide a second set of content for modifying the current state to be equal to or below the state threshold.
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