In a classical dichotic listening paradigm, besides auditory brain asymmetry, cognitive functions such as attention and conflict resolution play a major role. The aim of this study is to reveal the possible haemodynamic mechanisms of higher attentional performance in prefrontal cortex during dichotic listening test. Twenty-six healthy participants underwent a dichotic listening task in three sessions; non-forced attention, attention focused to right ear, and attention focused to left ear. In each session, haemodynamic activity of prefrontal brain area was recorded using functional near-infrared spectroscopy (fNIRS). Effects of focused attention and performance level of the task on oxy-, deoxy-, and total haemoglobin levels were investigated. Oxy- and total haemoglobin levels in right prefrontal regions during forced-right and forced-left sessions were significantly higher than levels of the non-forced session. This might be an indicator of inhibition and orienting attentional functions of right inferior frontal gyrus. High performers had significantly higher deoxyhaemoglobin levels in the forced-left session compared to the non-forced session, while low performers’ deoxyhaemoglobin levels did not differ among these sessions. Observing this difference only in the forced-left session but not in the forced-right session might suggest conflict resolution in top-down and bottom-up processes during the forced-left session for right-handed participants.

在经典的二项式听力范例中，除了听觉大脑不对称以外，诸如注意和解决冲突等认知功能也起着重要作用。这项研究的目的是揭示在双耳听力测试中前额叶皮层更高注意力表现的可能的血液动力学机制。26名健康参与者在三节课中接受了分神听觉任务。非强迫注意力，注意力集中在右耳上，注意力集中在左耳上。在每个疗程中，使用功能性近红外光谱（fNIRS）记录前额脑区域的血流动力学活动。研究了注意力和任务执行水平对氧合，脱氧合和总血红蛋白水平的影响。在强迫右和强迫左期间，右前额叶区域的血红蛋白和总血红蛋白水平显着高于非强迫时期。这可能是抑制和定向右下额回的注意功能的指标。与非强迫训练相比，在左强迫训练中，高表现者​​的脱氧血红蛋白水平明显更高，而在低强度训练中，低表现者的除氧血红蛋白水平没有差异。仅在左强迫会话中观察到这种差异，而在右强迫会话中则没有观察到，这可能表明右撇子参与者在左强迫会话中自上而下和自下而上的过程中的冲突解决。这可能是抑制和定向右下额回的注意功能的指标。与非强迫训练相比，在左强迫训练中，高表现者​​的脱氧血红蛋白水平明显更高，而在低强度训练中，低表现者的除氧血红蛋白水平没有差异。仅在左强迫会话中观察到这种差异，而在右强迫会话中则没有观察到，这可能表明右撇子参与者在左强迫会话中自上而下和自下而上的过程中的冲突解决。这可能是抑制和定向右下额回的注意功能的指标。与非强迫训练相比，在左强迫训练中，高表现者​​的脱氧血红蛋白水平明显更高，而在低强度训练中，低表现者的除氧血红蛋白水平没有差异。仅在左强迫会话中观察到这种差异，而在右强迫会话中则没有观察到，这可能表明右撇子参与者在左强迫会话中自上而下和自下而上的过程中的冲突解决。