Table 9.

Change scores for seven-year-olds of (1) whole syllables versus 50% cough and (2) 50% cough versus three pitch periods, and results for t-tests comparing those scores. Standard deviations are in parentheses. UP: unprocessed stimuli; SWS: sine-wave stimuli; VOC: vocoded stimuli.

Change score	(1)	(2)	t	df	p
	Whole – 50%	50% – 3 pp
	Mean difference (SD)	Mean difference (SD)
UP
/b/, high–low	0.0 (0.0)	0.1 (0.4)	−1.0	19	NS
/b/, front–back	0.2 (0.6)	2.3 (4.9)	−1.85	19	0.079
/d/, high–low	0.0 (0.0)	12.7 (18.1)	−3.13	19	0.006
/d/, front–back	0.5 (2.2)	37.8 (11.6)	−13.74	19	<0.001
SWS
/b/, high–low	6.2 (14.0)	3.7 (8.5)	0.61	19	NS
/b/, front–back	9.4 (11.8)	6.8 (7.9)	0.69	18	NS
/d/, high–low	6.7 (12.3)	17.7 (16.2)	−2.13	18	0.047
/d/, front–back	3.6 (7.3)	22.7 (16.3)	−4.30	17	<0.001
VOC
/b/, high–low	13.6 (11.2)	3.9 (7.0)	2.53	15	0.023
/b/, front–back	18.0 (20.7)	1.8 (7.3)	2.25	10	0.048
/d/, high–low	20.5 (14.9)	5.0 (4.9)	3.24	10	0.009
/d/, front–back	18.6 (14.5)	4.3 (9.5)	2.37	10	0.040