Cognitive Research: Principles and Implications

Table 7 Mechanism of change—kinematic measures for human speakers

From: Speaking with a KN95 face mask: a within-subjects study on speaker adaptation and strategies to improve intelligibility

	Jaw ROM (mm³)		Jaw speed (mm/s)
	Mean	SD	Mean	SD
Mask only	93.80	104.05	32.36	12.76
No mask	220.80	157.35	50.96	28.99
Clear + Mask	225.31	210.69	36.23	15.81
Loud + Mask	193.24	245.32	36.68	11.96
Slow + Mask	212.36	345.86	26.78	12.17

	Head ROM (mm³)		Head speed (mm/s)
Mask only	1662.99	2447.11	23.20	6.15
No mask	1140.15	1276.60	23.07	6.26
Clear + Mask	4291.61	6638.28	27.61	9.67
Loud + Mask	2666.58	3675.84	29.31	8.05
Slow + Mask	1875.98	1937.34	21.17	7.43

Descriptive statistics mean and standard deviation (SD) for kinematic measures for the jaw (top) and head (bottom)

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