TABLE II.

Efficiency model. *Significant after Holm–Bonferroni correction, α = 0.05.

Effects	β	s.e.	df	t	p
Between-talker variability (multiple vs single talkers)	0.021	0.006	161	3.253	0.001*
Within-talker variability (multiple vs single exemplars)	0.018	0.006	161	2.783	0.006*
Target word variability (six- vs two-word choices)	0.177	0.006	161	27.711	≪ 0.0001*
Between-talker × Within-talker variability	0.007	0.006	161	1.107	0.270
Between-talker × Target word variability	0.011	0.006	161	1.741	0.084
Within-talker × Target word variability	0.004	0.006	161	0.596	0.552
Between-talker × Within-talker × Target word variability	0.008	0.006	161	1.251	0.213