RHY.12:5.2 - The missing information was duration

A four-beat phrase at half-second beat intervals requires sound from 0 to 1 second, silence from 1 to 2 seconds, and a new attack at 2 seconds. The learner’s onset-only prompt marks 0 and 2. The learner reproduces those attacks but releases the first sound almost immediately.

The teacher supplies the sustained sound and release in a timed demonstration and a duration-bearing representation. The learner performs the held sound to the release while a familiar gesture keeps the four-beat cycle. In the stipulated next attempt, the sound continues to 1, the following interval is silent, and the attack at 2 returns with the cycle.

The immediate failure is repaired without inferring a general timing deficit. The result still depends on the supplied duration information. Cha’s Takadimi criticism makes that omission visible; a continuation/rest convention is another available construction when its use has been taught. The beat gesture alone would not have resolved the missing duration.