. 2005 Jan 21;102(5):1797–1802. doi: 10.1073/pnas.0408402102

Table 2. Performance in short and long SOAs (in d′ units).

Condition	Young (n = 25)	Older normal (n = 16)	MCI (n = 11)
Precue	4.23 ± 0.74^a	3.24 ± 0.83^b	2.62 ± 0.52^b
Simultaneous	4.07 ± 0.77^a	3.01 ± 0.93^b	3.15 ± 1.38^b
SOA = 1.2 s	1.14 ± 0.31^a	0.89 ± 0.31^b	0.79 ± 0.50^b

Means in the same row with different superscripted letters differ significantly, as determined by Tukey's HSD test (P < 0.05).