Table 1.

Proportions of motoneurons in which EPSPs from the ipsilateral PT were found before and after tDCS.

	Proportions of motoneurons
Motoneurons with EPSPs from:	before		after		p
iPT alone	3/42	7%	12/66	18%	ns
co PT alone	14/42	33%	18/66	27%	ns
iPT & coPT	14/40	35%	36/58	55%	ns
iPT & MLF	11/34	32%	42/61	69%	*
coPT & MLF	12/36	33%	39/61	64%	*

First row, data for motoneurons in which iPT stimuli were evoking oligosynaptic, most likely disynaptic EPSPs by themselves, like in Fig. 2A. Second row, similar data for EPSPs evoked from coPT. Third row, data from motoneurons in which excitatory effects from iPT were deduced from mutual facilitation of oligosynaptic EPSPs evoked from iPT and coPT, i.e. when joint actions from iPT and coPT exceeded the sum of their separate actions, as in Fig. 2G or Fig. 4C. Fourth row, data from motoneurons in which excitatory effects from iPT were deduced from facilitation of EPSPs evoked from the MLF, as in Fig. 5AB and DE. Fifth row, as in the fourth row, but for excitatory effects from co PT, illustrated in Fig. 5C and F. The facilitation is attributed to spatial facilitation occurring at a premotoneuronal, most likely reticular level. Differences between proportions of motoneurons were tested for significance using z-test. They are indicated in the last column (* p<0.01, ns p≥0.05).