In the central nervous system, moving bars and tones lead to stable perceptions of motion and pitch and tell impalpable time intrinsically gained as mental constructs from sensory data. Stopwatch-like mechanisms measure the movements of objects and the duration of musical quarter, half, full notes. Interval-selective neurons discriminate the time intervals of successive events, but interval tuned microcircuits operating at the intermediate scale of milliseconds to tenths of a second for speech, music and motion detection still remain obscure objects of desire.
