Table 2.

Proportion change in baseline of sentence productivity, grammatical accuracy, and lexical selection according to average baseline performance, represented by mean sentence length, proportion of well-formed sentences, and proportion proportion of pronouns at 2 weeks and 2 months following real and sham stimulation.

	Simulation type	Time point	Spearman correlation
			ρ	R squared	p-value
Discourse Productivity: Number of nouns	Real	2 weeks	−0.9009	0.8116	0.0056
		2 months	0.0241	0.0006	0.9548
	Sham	2 weeks	0.4706	0.2215	0.3462
		2 months	−0.058	0.0034	0.9131
Sentence Productivity: Mean sentence length	Real	2 weeks	−0.0748	0.0056	0.8734
		2 months	0.4419	0.1953	0.273
	Sham	2 weeks	−0.1715	0.0294	0.7453
		2 months	−0.1715	0.0294	0.7453
Grammatical Accuracy: Proportion well-formed sentences	Real	2 weeks	0.5714	0.3265	0.1802
		2 months	0.4791	0.2295	0.2297
	Sham	2 weeks	−0.4058	0.1647	0.4247
		2 months	−0.6	0.3600	0.208
Lexical Selection: Proportion of pronouns	Real	2 weeks	0.2143	0.0459	0.6103
		2 months	0.2143	0.0459	0.6103
	Sham	2 weeks	−0.2571	0.0661	0.6228
		2 months	−0.2571	0.0661	0.6228

Proportion change from baseline was calculated as: (follow-up performance – baseline performance)/baseline performance. ^*Represents p < 0.05.