Tomohisa Asai’s research while affiliated with Advanced Telecommunications Research Institute International and other places

... While this interpretation needs to be quantitatively validated, it raises the possibility that tACS not only induces modulation of activity in localised regions but also leads to changes of specific functional patterns (i.e., functional networks, brain states, and neural manifolds). In recent years, an approach has been reported that shifts the focus from local brain activity to global spatiotemporal dynamics, capturing the essence of the brain by reframing overall brain activity as transitions in the state space (Asai et al., 2023). In this sense, future tES research should aim to clarify both the local effects in stimulated regions and the subsequent effects that propagate to other regions. ...

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Immediate Modulation of the Blood Oxygenation Level-Dependent Signals by Dual-Site Transcranial Alternating Current Stimulation Propagates Across the Whole Brain

... The temporal dynamics of these changes are particularly significant in pDoC (Panda et al., 2022;Panda et al., 2016). In recent years, numerous studies have reported that microstates may be associated with various psychological states (Baradits et al., 2020;Tamano et al., 2022;Bochet et al., 2021;Zanesco et al., 2020), providing insight into neural activity of the brain during resting-state. As a "quantitative indicator" of the distribution pattern of brain topographic maps, microstate analysis divides resting-state EEG signals into a limited number of distinct quasi-stable states (Khanna et al., 2015;Pascual-Marqui et al., 1995). ...

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Multiple patterns of EEG parameters and their role in the prediction of patients with prolonged disorders of consciousness

... Does having such a belief engender a stronger sense of agency? A recent study investigating the use of self-voice suggests this to be the case, showing that the intentional binding effect-an implicit measure of the sense of agency-was more pronounced for self-voice than for other-voice 16 . However, this phenomenon may be attributed to the relatively low actual level of control and the possibility that self-identification influenced the judgment criterion for the sense of agency in ambiguous conditions. ...

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Control over self and others’ face: exploitation and exploration

... Other EFFECTS OF ONE SESSION OF THETA OR HIGH ALPHA NEUROFEEDBACK 31 studies have applied micro-state analysis, which identifies short, stable, distinct patterns of electrical activity measured by EEG across the scalp (Férat et al., 2022;Khanna et al., 2015;Michel & Koenig, 2018), representing various cognitive processes (Tarailis et al., 2024). Currently, few studies have attempted to modulate these neural states via neurofeedback (Asai et al., 2022;Diaz Hernandez et al., 2016), and it is necessary to assess larger samples in well-controlled protocols to highlight the potential of these methods compared to the use of conventional brain frequencies. ...

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Effects of one session of theta or high alpha neurofeedback on EEG activity and working memory

... In previous studies, an insightful error was discovered when mark tests were applied using mirrors or video images and some toddler participants tried to locate the mark behind their head while it was placed on their forehead. We named this curious initial search error the "rear-search error" 6,7 . In a mirror mark test, 38% of 2-year-olds and 11% of 3-yearolds demonstrated the rear-search error initially 6 . ...

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“XR Mark Test” Reveals Sensorimotor Body Representation in Toddlers

... A previous study using event-related potentials showed that delayed selfvoice feedback elicited significantly larger neural responses than pitch-shifted self-voice feedback, indicating that the neural processing of auditory self-voice feedback is highly sensitive to its temporal features 29 . A recent preprint investigated the time perception of non-altered and acoustic distorted voice feedback, showing that the perceived interval between a person's speech and non-altered voice feedback was significantly shorter than that between the former and acoustic distorted voice feedback 30 . This phenomenon was explained by a strong sense of agency, which is considered to compress the time perception between voluntary actions and sensory feedback 31 for non-altered self-voice 30 . ...

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The over-estimation of distance for self-voice versus other-voice

... However, the SoA can be reduced by non-self-initiated interventions because the outcomes of the actions of an individual influenced by others differ from those predicted by internal models. In other words, autonomous transition control or shared control in which robots assist human operations can reduce the SoA [23], [24], [25], [26]. Therefore, methods that improve performance and reflect the intentions of operators in the perceived outcomes of their actions, even under time-varying delays, are needed. ...

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RNN-Based Visual Guidance for Enhanced Sense of Agency in Teleoperation With Time-Varying Delays

... With regard to face image development, a study investigated the spatial location of different parts of one's face in children with 2.5 or 3.5 years of age by using augmented reality and 3D face-building technology (Miyazaki et al. 2019). Participants had to locate a sign on their body that they saw in the real-time video in front of them and received a "cheerful" visual and auditory reward in case of correct detection. ...

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The Reflected Face as a Mask of the Self: An Appraisal of the Psychological and Neuroscientific Research About Self-face Recognition

... Moreover, it is essential to examine SoA for generating an event (e.g., acceleration of an object) as well as SoA for terminating an event (e.g., deceleration of the object) in the case of automatic driving systems. A recent study reported that explicit SoA for generating an event is stronger than SoA for terminating the event (Asai et al., 2019). Therefore, it is important to examine SoA other control types to understand SoA in automatic control fully. ...

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Explicit Sense of Agency in an Automatic Control Situation: Effects of Goal-Directed Action and the Gradual Emergence of Outcome

... When caring for the needs of people with incurable disease, the goal is to support dignity and meaning in life and death (10). As brain lesions have been associated with an altered sense of self (12)(13)(14), it is especially important for patients with brain tumors to be understood by those who care for them, not just as a patient but as a person. This can help to support a patients' sense of dignity and meaning. ...

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Dignity therapy for patients with brain tumours: qualitative reports from patients, caregivers and practitioners