Farmaki Cristina, Sakkalis Vangelis, Loesche Frank, Nisiforou Efi A
Computational Bio-Medicine Laboratory, Institute of Computer Science, Foundation for Research and Technology-Hellas, Heraklion, Greece.
Cognition Institute, University of Plymouth, Plymouth, United Kingdom.
Front Hum Neurosci. 2019 Oct 11;13:345. doi: 10.3389/fnhum.2019.00345. eCollection 2019.
Field Dependence-Independence (FDI) is a widely studied dimension of cognitive styles designed to measure an individual's ability to identify embedded parts of an organized visual field as entities separate from that given field. The research aims to determine whether the brain activity features that are considered to be perceptual switching indicators could serve as robust features, differentiating Field-Dependent (FD) from Field-Independent (FI) participants. Previous research suggests that various features derived from event related potentials (ERP) and frequency features are associated with the perceptual reversal occurring during the observation of a bistable image. In this study, we combined these features in the context of a different experimental scheme using ambiguous and unambiguous stimuli during participants' perceptual observations. We assessed the participants' FD-I classification with the use of the Hidden Figures Test (HFT). Results show that the peak amplitude of the frontoparietal positivity, the late positive deflection in frontal and parietal areas, is higher for the FD group at specific locations of the left lobe, whereas it occurs later for the FD group at the central and occipital electrodes. Additionally, the FD group exhibits higher levels of gamma power before stimulus onset at channel TP10 and higher gamma power during reversal at the right centroparietal electrodes (T8, CP6, and TP10). The peak amplitude of the reversal positivity, the positive deflection during the reversal, is higher for the FD group at the rear right lobe (P4).
场依存性-独立性（FDI）是一个被广泛研究的认知风格维度，旨在衡量个体将有组织视野中的嵌入部分识别为与给定视野分离的实体的能力。该研究旨在确定被认为是知觉转换指标的大脑活动特征是否可以作为区分场依存型（FD）和场独立型（FI）参与者的稳健特征。先前的研究表明，从事件相关电位（ERP）中提取的各种特征和频率特征与在观察双稳态图像期间发生的知觉反转有关。在本研究中，我们在不同的实验方案背景下，在参与者的知觉观察期间使用模糊和明确的刺激来组合这些特征。我们使用隐藏图形测试（HFT）评估参与者的FD-I分类。结果表明，额顶叶正波的峰值幅度，即额叶和顶叶区域的晚期正偏转，在左叶的特定位置上，FD组更高，而在中央和枕叶电极处，FD组出现得更晚。此外，FD组在刺激开始前在通道TP10处表现出更高的伽马功率水平，在反转期间在右侧中央顶叶电极（T8、CP6和TP10）处表现出更高的伽马功率。反转正波的峰值幅度，即反转期间的正偏转，在右后叶（P4）处FD组更高。
