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Li R, Xu M, You J, Zhou X, Meng J, Xiao X, Jung TP, Ming D. Modulation of rhythmic visual stimulation on left-right attentional asymmetry. Front Neurosci 2023; 17:1156890. [PMID: 37250403 PMCID: PMC10213214 DOI: 10.3389/fnins.2023.1156890] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2023] [Accepted: 04/25/2023] [Indexed: 05/31/2023] Open
Abstract
The rhythmic visual stimulation (RVS)-induced oscillatory brain responses, namely steady-state visual evoked potentials (SSVEPs), have been widely used as a biomarker in studies of neural processing based on the assumption that they would not affect cognition. However, recent studies have suggested that the generation of SSVEPs might be attributed to neural entrainment and thus could impact brain functions. But their neural and behavioral effects are yet to be explored. No study has reported the SSVEP influence on functional cerebral asymmetry (FCA). We propose a novel lateralized visual discrimination paradigm to test the SSVEP effects on visuospatial selective attention by FCA analyses. Thirty-eight participants covertly shifted their attention to a target triangle appearing in either the lower-left or -right visual field (LVF or RVF), and judged its orientation. Meanwhile, participants were exposed to a series of task-independent RVSs at different frequencies, including 0 (no RVS), 10, 15, and 40-Hz. As a result, it showed that target discrimination accuracy and reaction time (RT) varied significantly across RVS frequency. Furthermore, attentional asymmetries differed for the 40-Hz condition relative to the 10-Hz condition as indexed by enhanced RT bias to the right visual field, and larger Pd EEG component for attentional suppression. Our results demonstrated that RVSs had frequency-specific effects on left-right attentional asymmetries in both behavior and neural activities. These findings provided new insights into the functional role of SSVEP on FCAs.
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Affiliation(s)
- Rong Li
- College of Precision Instruments and Optoelectronics Engineering, Tianjin University, Tianjin, China
| | - Minpeng Xu
- College of Precision Instruments and Optoelectronics Engineering, Tianjin University, Tianjin, China
- Academy of Medical Engineering and Translational Medicine, Tianjin University, Tianjin, China
| | - Jia You
- College of Precision Instruments and Optoelectronics Engineering, Tianjin University, Tianjin, China
| | - Xiaoyu Zhou
- College of Precision Instruments and Optoelectronics Engineering, Tianjin University, Tianjin, China
| | - Jiayuan Meng
- College of Precision Instruments and Optoelectronics Engineering, Tianjin University, Tianjin, China
- Academy of Medical Engineering and Translational Medicine, Tianjin University, Tianjin, China
| | - Xiaolin Xiao
- College of Precision Instruments and Optoelectronics Engineering, Tianjin University, Tianjin, China
- Academy of Medical Engineering and Translational Medicine, Tianjin University, Tianjin, China
| | - Tzyy-Ping Jung
- College of Precision Instruments and Optoelectronics Engineering, Tianjin University, Tianjin, China
- Academy of Medical Engineering and Translational Medicine, Tianjin University, Tianjin, China
- Swartz Center for Computational Neuroscience, University of California San Diego, San Diego, CA, United States
| | - Dong Ming
- College of Precision Instruments and Optoelectronics Engineering, Tianjin University, Tianjin, China
- Academy of Medical Engineering and Translational Medicine, Tianjin University, Tianjin, China
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Ventura P, Delgado J, Ferreira M, Farinha-Fernandes A, Guerreiro JC, Faustino B, Leite I, Wong ACN. Hemispheric asymmetry in holistic processing of words. Laterality 2018; 24:98-112. [PMID: 29756509 DOI: 10.1080/1357650x.2018.1475483] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Abstract
Holistic processing has been regarded as a hallmark of face perception, indicating the automatic and obligatory tendency of the visual system to process all face parts as a perceptual unit rather than in isolation. Studies involving lateralized stimulus presentation suggest that the right hemisphere dominates holistic face processing. Holistic processing can also be shown with other categories such as words and thus it is not specific to faces or face-like expertize. Here, we used divided visual field presentation to investigate the possibly different contributions of the two hemispheres for holistic word processing. Observers performed same/different judgment on the cued parts of two sequentially presented words in the complete composite paradigm. Our data indicate a right hemisphere specialization for holistic word processing. Thus, these markers of expert object recognition are domain general.
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Affiliation(s)
- Paulo Ventura
- a Faculdade de Psicologia , Universidade de Lisboa, Alameda da Universidade , Lisboa , Portugal
| | - João Delgado
- a Faculdade de Psicologia , Universidade de Lisboa, Alameda da Universidade , Lisboa , Portugal
| | - Miguel Ferreira
- a Faculdade de Psicologia , Universidade de Lisboa, Alameda da Universidade , Lisboa , Portugal
| | | | - José C Guerreiro
- a Faculdade de Psicologia , Universidade de Lisboa, Alameda da Universidade , Lisboa , Portugal
| | - Bruno Faustino
- a Faculdade de Psicologia , Universidade de Lisboa, Alameda da Universidade , Lisboa , Portugal
| | - Isabel Leite
- b Departamento de Psicologia , Universidade de Évora, Colégio Pedro da Fonseca, Parque Industrial e Tecnológico de Évora , Évora , Portugal
| | - Alan C-N Wong
- c Department of Psychology , The Chinese University of Hong Kong , Shatin, N.T. , Hong Kong
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Perceptual and gaze biases during face processing: related or not? PLoS One 2014; 9:e85746. [PMID: 24454927 PMCID: PMC3893266 DOI: 10.1371/journal.pone.0085746] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2013] [Accepted: 11/29/2013] [Indexed: 11/21/2022] Open
Abstract
Previous studies have demonstrated a left perceptual bias while looking at faces, due to the fact that observers mainly use information from the left side of a face (from the observer's point of view) to perform a judgment task. Such a bias is consistent with the right hemisphere dominance for face processing and has sometimes been linked to a left gaze bias, i.e. more and/or longer fixations on the left side of the face. Here, we recorded eye-movements, in two different experiments during a gender judgment task, using normal and chimeric faces which were presented above, below, right or left to the central fixation point or on it (central position). Participants performed the judgment task by remaining fixated on the fixation point or after executing several saccades (up to three). A left perceptual bias was not systematically found as it depended on the number of allowed saccades and face position. Moreover, the gaze bias clearly depended on the face position as the initial fixation was guided by face position and landed on the closest half-face, toward the center of gravity of the face. The analysis of the subsequent fixations revealed that observers move their eyes from one side to the other. More importantly, no apparent link between gaze and perceptual biases was found here. This implies that we do not look necessarily toward the side of the face that we use to make a gender judgment task. Despite the fact that these results may be limited by the absence of perceptual and gaze biases in some conditions, we emphasized the inter-individual differences observed in terms of perceptual bias, hinting at the importance of performing individual analysis and drawing attention to the influence of the method used to study this bias.
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