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44 3.5. Effects of surgery Behavioural performances were considered as impaired post-surgery when they showed, as compared with pre-operative data, a statistically significant decrease of accuracy and/or statistically increase of reaction time. By opposition, Behavioural performances were defined as improved when they showed, as compared with pre-operative data, a statistically significant better accuracy and/or statistically shorter reaction time. 3.5.1. Effects of surgery on behavioural performances Seven patients showed language changes in the semantic domain after surgery (see Table 7 and Table 8 in appendix for statistical details): 2 patients exhibited a significant impairment, one for reaction times (P11) and one for both accuracy and reaction times (P5), while 5 patients demonstrated a significant improvement, 3 in terms of accuracy (P7, P8 and P14) and 2 for reaction times. Behavioural comparison revealed no change in the other patients ,
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