Wong Min Ney, Chan Yanky, Ng Manwa L, Zhu Frank F
a Department of Chinese and Bilingual Studies , The Hong Kong Polytechnic University , Hung Hom, Kowloon , Hong Kong.
b Speech Science Laboratory, Division of Speech and Hearing Sciences, Faculty of Education , The University of Hong Kong , Pokfulam , Hong Kong.
Int J Speech Lang Pathol. 2019 Apr;21(2):182-188. doi: 10.1080/17549507.2017.1417480. Epub 2018 Apr 11.
The present study aimed to explore the short-term effect of anodal transcranial direct current stimulation (tDCS) on tongue twister production.
Thirty healthy native Cantonese adult speakers were randomly assigned to the anodal tDCS group or the sham tDCS group. Anodal tDCS of 2 mA was applied over the Broca's area of the brain. The stimulation lasted for 20 min for the anodal tDCS group and 30 s for the sham tDCS group. The participants were instructed to produce a list of tongue twisters before, immediately after and 4 h after tDCS.
Speech rate and response accuracy measured immediately after stimulation were significantly faster and higher, respectively, than before stimulation. Although there was no change in speech rate measured at 4 h after stimulation, response accuracy at that time point was significantly lower than that measured immediately after stimulation. However, there were no significant differences between the anodal tDCS and sham tDCS groups in either speech rate or response accuracy.
The findings revealed that a single session of anodal tDCS over the Broca's area did not significantly improve speech production during tongue twister production.
本研究旨在探讨阳极经颅直流电刺激（tDCS）对绕口令朗读的短期影响。
30名以粤语为母语的健康成年受试者被随机分为阳极tDCS组和伪刺激tDCS组。对大脑的布洛卡区施加2毫安的阳极tDCS。阳极tDCS组的刺激持续20分钟，伪刺激tDCS组的刺激持续30秒。要求受试者在tDCS前、刺激后立即以及刺激后4小时朗读一系列绕口令。
刺激后立即测量的语速和反应准确率分别显著高于刺激前。虽然刺激后4小时测量的语速没有变化，但该时间点的反应准确率显著低于刺激后立即测量的结果。然而，阳极tDCS组和伪刺激tDCS组在语速或反应准确率方面均无显著差异。
研究结果表明，对布洛卡区进行单次阳极tDCS并不能显著改善绕口令朗读时的言语产生。
