Table 2.

Location of chronic stimulating electrodes in the three monkeys

Monkey	Location	Electrode code	Depth (mm)	Lamina	rICMS		Experiment duration (weeks)	Current used (μA)
Monkey	Location	Electrode code	Depth (mm)	Lamina	Threshold (μA)	Effect	Experiment duration (weeks)	Current used (μA)
CS25
Electrode	M1	4	4.2	VI/wm	35	I ext	5	40–80
Electrode	F5	3	2.6	V	55	I abd	5	70–120
Cannula	M1		1.5–4.5
CS26
Electrode	M1	A4	3	V	12	I flx	16	20–50
Electrode	F5	C4	5	III/V	30	I abd	16	100–120
Cannula	M1	B5	1.5–4.5
CS27
Electrode	M1	C3	3.9	VI	6	II–V flx	10	30–70
Electrode	F5	A5	4.5	III	40	I ext	7	40–80
Cannula	M1	B3	1.5–4.5

Locations of electrodes are coded by grid position (see Fig 1A, CS26, CS27) or number in the implanted array (CS25). Locations were determined from postmortem histology; the depth (in millimeters) is the depth along the track from the pial surface measured in fixed tissue. The cortical lamina in which the electrode tip was located is also indicated. Motor effects and thresholds of rICMS at the beginning of the experimental period are given for each electrode. Experiments lasted for between 5 and 16 weeks, and the range of currents used in this period is indicated in the last column. All the M1 electrode and cannula tracks were in the rostral bank of the central sulcus. All the F5 electrode and cannula tracks were in the inferior bank of the arcuate sulcus. I, Thumb; II–V, fingers; ext, extension; flx, flexion; abd, abduction; add, adduction; wm, white matter.