Jay's 46 study described a fairly detailed method of GHT delivery and provided descriptive infant behavioral responses; however, a detailed protocol describing a plan to modify or terminate the GHT intervention based on infant physiologic or behavioral cues was not presented. Behavioral cues were measured during the intervention, but there is no baseline behavioral state reported before the initiation of GHT. Therefore, it is difficult to determine whether or not GHT delivery was based on infant cues, even though infant behaviors were observed.