Department of Medical Imaging, Faculty of Health Sciences, Universiti Sultan Zainal Abidin, 21300, Kuala Terengganu, Malaysia.
Centre for Health and Applied Sciences, Faculty of Health Sciences, Universiti Kebangsaan Malaysia, Jalan Raja Muda Abdul Aziz, 50300, Kuala Lumpur, Malaysia.
Exp Brain Res. 2020 Apr;238(4):945-956. doi: 10.1007/s00221-020-05765-3. Epub 2020 Mar 16.
The present study examined the impact of white noise on word recall performance and brain activity in 40 healthy adolescents, split in two groups (normal and low) depending on their auditory working memory capacity (AWMC). Using functional magnetic resonance imaging, participants performed a backward recall task under four different signal-to-noise ratio (SNR) conditions: 15, 10, 5, and 0-dB SNR. Behaviorally, normal AWMC individuals scored significantly higher than low AWMC individuals across noise levels. Whole-brain analyses showed brain activation not to be statistically different between groups across noise levels. In the normal group, a significant positive relationship was found between performance and number of activated voxels in the right superior frontal gyrus. In the low group, significant positive correlations were found between performance and number of activated voxels in left superior frontal gyrus, left inferior frontal gyrus, and left anterior cingulate cortex. These findings suggest that the strategic structure involved in the enhancement of AWM performance may differ in normal and low AWMC individuals.
本研究考察了白噪声对 40 名健康青少年单词回忆表现和大脑活动的影响，这些青少年根据其听觉工作记忆能力（AWMC）分为正常和低两组。使用功能磁共振成像，参与者在四种不同信噪比（SNR）条件下进行了反向回忆任务：15、10、5 和 0 dB SNR。行为上，正常 AWMC 个体在各个噪声水平下的得分均显著高于低 AWMC 个体。全脑分析表明，各组在各个噪声水平下的大脑激活没有统计学差异。在正常组中，发现表现与右额上回激活的体素数量之间存在显著的正相关关系。在低 AWMC 组中，发现表现与左额上回、左额下回和左前扣带回激活的体素数量之间存在显著的正相关关系。这些发现表明，在正常和低 AWMC 个体中，增强 AWM 表现所涉及的策略结构可能不同。
