Balasubramanium Radish Kumar, Dodderi Thejaswi, Bhat Jayashree S
Department of Audiology and Speech Language Pathology, Kasturba Medical College, Manipal Academy of Higher Education, Mangalore, Karnataka, India.
Department of Audiology and Speech Language Pathology, Nitte Institute of Speech and Hearing, Mangalore, Karnataka, India.
Neurol Res Int. 2017;2017:8762610. doi: 10.1155/2017/8762610. Epub 2017 Nov 29.
It is well established that the brainstem regulates the act of swallow. However, the role of cortex and its influence on swallowing are still a question. Hence, the present study aimed to investigate if cerebral hemispheric laterality controls swallow activity.
Thirty normal right handed participants were subjected to time test of swallow using 100 ml of water. Dual paradigm was used to investigate hemispheric laterality for swallowing which involved listening to the speech or music stimuli presented binaurally while swallowing. The clinician measured total time taken and hyolaryngeal movement simultaneously which was used to calculate volume/time, volume/swallow, and time/swallow on an offline basis.
Results revealed that swallow performance decreased with the dual task paradigm compared to baseline swallow. These results are suggestive of cortex playing a role during swallowing in the dual task paradigm. Moreover, quantitative parameters like volume/swallow and volume/time were affected more when speech was competing with swallowing. However, music exerted greater interference over the speech for time/swallow.
These results suggests that there exists differential cue lateralization hypothesis which means volume related parameters are controlled by left hemisphere and time related swallowing parameters are controlled at the right hemisphere.
脑干调节吞咽动作已得到充分证实。然而，大脑皮层的作用及其对吞咽的影响仍是一个问题。因此，本研究旨在调查大脑半球偏侧性是否控制吞咽活动。
30名正常右利手参与者用100毫升水进行吞咽时间测试。采用双范式研究吞咽的半球偏侧性，即在吞咽时双耳聆听语音或音乐刺激。临床医生同时测量总用时和舌骨喉运动，用于离线计算容积/时间、容积/吞咽次数和时间/吞咽次数。
结果显示，与基线吞咽相比，双任务范式下吞咽表现下降。这些结果表明大脑皮层在双任务范式吞咽过程中发挥作用。此外，当语音与吞咽同时进行时，诸如容积/吞咽次数和容积/时间等定量参数受影响更大。然而，就时间/吞咽次数而言，音乐对语音的干扰更大。
这些结果表明存在差异线索侧化假说，即与容积相关的参数由左半球控制，与时间相关的吞咽参数由右半球控制。
