. Author manuscript; available in PMC: 2015 Jun 30.

Published in final edited form as: J Speech Lang Hear Res. 2011 Aug 23;54(6):1667–1681. doi: 10.1044/1092-4388(2011/09-0279)

Table 1.

F1 target frequency and intensity ratios used in each VF stimulus series in Experiment 1 for the /ʌ/-/ɑ/ vowel pair (/ʌ/= step 1; /ɑ/= step 10).

Virtual formant series	Series step	F1 target frequency (Hz)	Intensity ratio at each VF series step
Virtual formant series	Series step	F1 target frequency (Hz)	Lower pair	Higher pair

VF1.1			480/600 Hz	840/960 Hz
	1	620	0.778	0.222
	2	633	0.742	0.258
	3	645	0.708	0.292
	4	657	0.675	0.325
	5	669	0.642	0.358
	6	681	0.608	0.392
	7	693	0.575	0.425
	8	705	0.542	0.458
	9	717	0.508	0.492
	10	730	0.472	0.528
VF1.2			360/480 Hz	960/1080 Hz
	1	620	0.667	0.333
	2	633	0.645	0.355
	3	645	0.625	0.375
	4	657	0.605	0.395
	5	669	0.585	0.415
	6	681	0.565	0.435
	7	693	0.545	0.455
	8	705	0.525	0.475
	9	717	0.505	0.495
	10	730	0.483	0.517