Table 1.

Demographics and behavioral performance characteristics in WALK condition

Animal	Age	Sex	No. of laps	Time into run (min:sec)	Time at last lap	Time out of run	Mean GM*
35481	8 y 11 mo	M	54	4:03	20:14	20:51	111.04
35765	8 y 1 mo	M	34	2:02	19:57	20:12	119.58
31299	12 y 8 mo	M	21	2:38	20:11	20:17	118.38
23938	25 y 5 mo	M	27	3:00	20:42	21:10	118.21
22119	27 y	M	27	2:33	20:31	20:31	108.54
21899	27 y 9 mo	F	18	2:29	20:09	20:11	114.75

*Mean GM = global mean metabolism of gray matter from each monkey during the WALK condition.