Table 1.

Subject demographics

	Mean	Standard error
Age	21.54	0.29
Intelligence	107.82	1.70
Total brain volume (mm3)	1,266.44	11.06
Normalized hippocampal volume (%)	0.42	0.005
Normalized amygdalar volume (%)	0.28	0.003
Short-delay retention	−8.39	1.49
Long-delay retention	−3.93	1.47
Discriminability	0.95	0.007
Total learning	60.85	1.14
Proactive interference	−8.74	3.65