Table 1.

Summary of neural activity blocking experiments

Stim. areaa	Block areab	Type of block of locomotor activity
		Completec	Partiald	No blocke
VMDf,g	ARRN	3	7	0
	MRRN	0	2	4
	PRRN	2	6	3
DLMf,g	ARRN	2	4	2
	MRRN	2	5	2
	PRRN	4	6	3
RLRf,h	VMD	3	2	0
RLRf,h	DLM	3	1	0

^aBrain areas in which pharmacological microstimulation was applied to initiate spinal locomotor activity (see Experimental Procedures).

^bBrain areas in which a solution that depresses neuronal activity (i.e., “blocking solution,”; see Experimental Procedures) was ejected.

^cNumbers of animals in which ejection of blocking solution completely abolished burst activity for at least 5 s (usually much longer; see Experimental Procedures for criteria for complete and partial blockade of locomotor activity).

^dNumbers of animals in which the amplitudes of locomotor burst activity were clearly decreased for at least 5 s (usually much longer) during ejection of blocking solution.

^eNumbers of animals in which there was no obvious decrease in burst amplitudes during the ejection of blocking solution.

^fBecause repeatable, long duration episodes of locomotor activity were required for blocking experiments, in a given animal, not all combinations of stimulation and blocking were always performed.

^gTotal number of animals=18.

^hTotal number of animals=5.