occurs when you "coax" a person to talk after he has begun with a nod or a low "yes" you ack, make him forget, then make him believe you haven't got it and then make him tell you at great length. He feels bad and doesn't cognite and may ARC break. Any habit of agreeable noises and nods can be mistaken for acknowledgement, ends cycle on the speaker, causes him to forget, feel dull, believe the listener is stupid, get cross, get exhausted explaining and ARC break. The missed withhold is inadvertent. One didn't get a chance to say what one was going to say because one was stopped by premature acknowledgement. Result, missed W/H in the speaker, with all its consequences. (HCOB 7 Apr 65)