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. Author manuscript; available in PMC: 2011 Dec 1.

Published in final edited form as: Psychol Aging. 2010 Dec;25(4):811–821. doi: 10.1037/a0019888

Table 2.

Signal Detection Scores and Proportion Correct for Smile Discrimination in Studies 1 and 2

	Study 1				Study 2
	Younger adults n = 41	Older adults n = 33			Younger adults n = 23	Older adults n = 26

	M (SD)	M (SD)	Between-groups t	Cohen’s d	M (SD)	M (SD)	Between-groups t	Cohen’s d
d ’	0.59 (0.68)^a	0.70 (0.55)^a	−0.74	−0.17	0.17 (0.53)	0.66 (0.46)^a	−3.47^**	−0.80
C, response bias	0.33 (0.30)^a	0.37 (0.28)^a	−0.59	−0.14	0.05 (0.40)	0.26 (0.30)^a	−2.13^*	−0.87
Proportion correct	0.57 (0.11)^b	0.60 (0.10)^b	−0.90	−0.21	0.53 (0.10)	0.60 (0.08)^b	−3.01^**	−0.90

^a

One-sample t-test significantly different from zero at p < .01.

^b

One-sample t-test significantly different from .50 at p < .01.

^*

p < .05.

^**

p < .01.