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Table 3. 

Percentages of Error Types Arising from Stimulation to Each Brain Region

Error Code IFG STG/MTG Other No Stimulation p (F ≠ T) p (F ≠ N) 
Syntactic error (%) 10 .0022* .0006* 
Semantic paraphasia (%) N/A N/A 
Phonemic paraphasia (%) N/A N/A 
Perserveration (%) .040* .17 
Pause (%) 21 21 12 16 .89 .35 
Retracing (%) 16 .030* .024* 
False start (%) .50 .61 
Abandoned utterance (%) N/A N/A 
Speech arrest (%) 10 .064 .0006* 
 
Total number of trials 233 121 65 85   
Error Code IFG STG/MTG Other No Stimulation p (F ≠ T) p (F ≠ N) 
Syntactic error (%) 10 .0022* .0006* 
Semantic paraphasia (%) N/A N/A 
Phonemic paraphasia (%) N/A N/A 
Perserveration (%) .040* .17 
Pause (%) 21 21 12 16 .89 .35 
Retracing (%) 16 .030* .024* 
False start (%) .50 .61 
Abandoned utterance (%) N/A N/A 
Speech arrest (%) 10 .064 .0006* 
 
Total number of trials 233 121 65 85   

Error frequencies were compared between trials with frontal (F) and temporal (T) stimulation and between frontal (F) and no (N) stimulation, for error types that occurred at least 10 times, using a series of Fisher's exact tests (two-tailed). STG/MTG = superior temporal gyrus/middle temporal gyrus.

*

Significant after correction for multiple comparisons using positive false discovery rate (Storey, 2002) as implemented in the MATLAB function mafdr.

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