“…In most studies, the stimulus is an audiotape recording and the laughter is prerecorded. Using these methods, some researchers have found higher levels of both overt laughter and humor ratings of the stimulus in response to laughter by others (Fuller & Sheehy-SkeYngton, 1974;Martin & Gray, 1996;Smyth & Fuller, 1972); some researchers have found higher levels of overt laughter, but no diVerences in humor ratings (Chapman, 1973;Pistole & Shor, 1979); and at least one researcher has found higher humor ratings, but no overt laughter eVect (PorterWeld et al, 1988). 1 In two studies, the laughter of live confederates was used (Chapman & Chapman, 1974;Nosanchuk & Lightstone, 1974).…”