Detecting morphed passport photos: a training and individual differences approach

Cognitive Research: Principles and Implications

Table 2 Mean performance scores both pre- and post-guidance/training

	Baseline Performance
	Guidance Group				Training Group
	Hits (%)	FA (%)	d'	c	Hits (%)	FA (%)	d'	c
30% Morphs	53	23	0.76	0.36	46	27	0.47	0.38
40% Morphs	39	23	0.38	0.55	40	27	0.31	0.46
50% Morphs	59	23	0.96	0.26	52	27	0.56	0.34
All Morphs	50	23	0.70	0.39	45	27	0.45	0.40
	Post-Guidance/Training Performance
	Guidance Group				Training Group
	Hits (%)	FA (%)	d'	c	Hits (%)	FA (%)	d'	c
30% Morphs	65	7	2.15	0.60	74	7	2.48	0.50
40% Morphs	73	7	2.41	0.47	79	7	2.69	0.39
50% Morphs	75	7	2.32	0.52	85	7	2.69	0.39
All Morphs	71	7	2.29	0.53	79	7	2.62	0.43

Abbreviations: d′ Detection sensitivity, c Criterion score, FA False alarm
Note: Because of the experimental design, when assessing morph detection sensitivity at each morph grade, the FA rate remains constant as the different morph grades were presented within the same array
All Morphs show performance averaged across morph grades (30%, 40%, 50%)