Annu Int Conf IEEE Eng Med Biol Soc. 2021 Nov;2021:5944-5947. doi: 10.1109/EMBC46164.2021.9629497.
Rhythmic visual stimulation (RVS) has been demonstrated to modulate ongoing neuronal oscillations which might be greatly involved in attention processes and thus bring some behavioral consequences. However, there was little knowledge about the effective frequency parameter of RVS which could impact task performance in visuo-spatial selective attention. Thus, here, we addressed this question by investigating the modulating effects of RVSs in different attention-related frequency bands, i.e., alpha (10 Hz) and gamma band (40 Hz). Sixteen participants were recruited to perform a modified visuo-spatial selective attention task. They were required to identify the orientation of target-triangle in visual search arrays while undergoing different RVS backgrounds. By analyzing the acquired behavioral and EEG data, we observed that, compared with control group (no RVS), 40 Hz RVS led to significantly shorter reaction time (RT) while 10 Hz RVS did not bring obvious behavioral consequences. In addition, although both 10 and 40 Hz RVS led to a global enhancement of SSVEP spectrum in the gamma band, 40 Hz RVS led to even larger 40 Hz SSVEP spectrum in prefrontal cortex. Our findings indicate that 40 Hz RVS has an effectively enhancing effect on selective attention and support the crucial role of prefrontal area in selective attention.
节律性视觉刺激（RVS）已被证明可以调节正在进行的神经元振荡，这可能与注意力过程密切相关，并因此带来一些行为后果。然而，关于 RVS 的有效频率参数知之甚少，该参数可能会影响视觉空间选择性注意任务的表现。因此，在这里，我们通过研究不同与注意力相关的频率带（即 alpha（10 Hz）和 gamma 带（40 Hz））中的 RVS 的调制效应来解决这个问题。招募了 16 名参与者来执行修改后的视觉空间选择性注意任务。要求他们在接受不同的 RVS 背景的同时识别视觉搜索数组中目标三角形的方向。通过分析获得的行为和 EEG 数据，我们观察到与对照组（无 RVS）相比，40 Hz RVS 导致反应时间（RT）明显缩短，而 10 Hz RVS 没有带来明显的行为后果。此外，尽管 10 Hz 和 40 Hz RVS 都导致了 gamma 带中 SSVEP 谱的全局增强，但 40 Hz RVS 在前额叶皮层中甚至导致更大的 40 Hz SSVEP 谱。我们的研究结果表明，40 Hz RVS 对选择性注意力具有有效增强作用，并支持前额叶区域在选择性注意力中的关键作用。
