Hyun-Taek Kim

Hyun-Taek Kim
Korea University | KU

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54
Publications
25,063
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2,371
Citations

Publications

Publications (54)
Article
Full-text available
Cognitive aging widely varies among individuals due to different stress experiences throughout the lifespan and vulnerability of neurocognitive mechanisms. To understand the heterogeneity of cognitive aging, we investigated the effect of early adulthood stress (EAS) on three different hippocampus-dependent memory tasks: the novel object recognition...
Article
Full-text available
Many studies have consistently proven that repeatedly watching virtual reality (VR) content can reduce cybersickness. Moreover, the discomfort level decreases when the VR content includes an unusual orientation, such as an inverted scene. However, few studies have investigated the physiological changes during these experiences. The present study ai...
Article
In the Concealed Information Test (CIT), differential responses between crime-relevant and crime-irrelevant items are indicative of concealed knowledge of a crime, and are used to classify an individual as either “guilty” or “innocent”. However, when crime-relevant items are leaked before the test, an innocent examinee can exhibit enhanced response...
Article
Full-text available
Cybersickness refers to a group of uncomfortable symptoms experienced in virtual reality (VR). Among several theories of cybersickness, the subjective vertical mismatch (SVM) theory focuses on an individual's internal model, which is created and updated through past experiences. Although previous studies have attempted to provide experimental evide...
Article
Full-text available
In virtual reality (VR), users can experience symptoms of motion sickness, which is referred to as VR sickness or cybersickness. The symptoms include but are not limited to eye fatigue, disorientation, and nausea, which can impair the VR experience of users. Though many studies have attempted to reduce the discomfort, they produced conflicting resu...
Article
Full-text available
It has been well demonstrated that shared multisensory experiences between the self and others can influence the social perception of out-group members. Previous research has shown that the illusion of ownership over a dark-skinned rubber hand or full virtual body generated less negative implicit bias against people with dark skin. However, less is...
Article
Full-text available
The Empathy for Dementia using Virtual Reality (EDuVR) system, developed by the Jeju Provincial Dementia Center, is a 3D video system capturing the experience of dementia in a first-person perspective using 360 degree vritual reality (VR) technology. It was developed to create a greater understanding of dementia and to help people empathize with in...
Article
Full-text available
In virtual reality (VR), users can experience symptoms of motion sickness, which is referred to as VR sickness or cybersickness. The symptoms include but are not limited to eye fatigue, disorientation, and nausea, which can impair the VR experience of users. Though many studies have attempted to reduce the discomfort, they produced conflicting resu...
Article
Full-text available
Schizotypy refers to the personality trait of experiencing “psychotic” symptoms and can be regarded as a predisposition of schizophrenia-spectrum psychopathology (Raine, 1991). Cumulative evidence has revealed that individuals with schizotypy, as well as schizophrenia patients, have emotional processing deficits. In the present study, we investigat...
Article
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Background: Developing valid emotional facial stimuli for specific ethnicities creates ample opportunities to investigate both the nature of emotional facial information processing in general and clinical populations as well as the underlying mechanisms of facial emotion processing within and across cultures. Given that most entries in emotional fa...
Article
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Despite the extant quantum communication technology that does not allow copying, wiretapping, and/or monitoring, cyber-terror-attempts from hackers with unconscientious purposes and motives are prospected to persist. Hence, it is imperative and necessary to invest in studies geared toward understanding the psychology of hackers. The current study r...
Article
Full-text available
Recently, numerous efforts have been made to understand the neural mechanisms underlying cognitive regulation of emotion, such as cognitive reappraisal. Many studies have reported that cognitive control of emotion induces increases in neural activity of the control system, including the prefrontal cortex and the dorsal anterior cingulate cortex, an...
Article
Full-text available
Vocal expression of emotions (EE) in retrieval of events from autobiographical memory was investigated in patients in early stages of Alzheimer's disease (AD). Twenty-one AD patients and 19 controls were interviewed, and EE of the reported memories was rated by 8 independent evaluators. The AD group had lower EE of both recent and remote memory tha...
Article
One's ability to properly regulate emotion is critical to psychological and physical well-being. Among various strategies to regulate emotion, cognitive reappraisal has been shown to modulate both emotional experience and emotional memory. However, most studies of reappraisal have focused on reappraisal of negative situations, with reappraisal of p...
Article
Full-text available
Despite the well-known role of the amygdala in mediating emotional interference during tasks requiring cognitive resources, no definite conclusion has yet been reached regarding the differential roles of functionally and anatomically distinctive subcomponents of the amygdala in such processes. In the present study, we examined female participants a...
Conference Paper
Cybersickness is an undesirable side effect, which occurs when people experience in a virtual environment (VE). A number of studies have tried to find ways to control cybersickness and some of them have demonstrated that presenting rest frames in VE might be one promising method to reduce cybersickness. This study investigates the effects of rest f...
Article
The present study examines how gamma oscillations can be modulated by cognitive reappraisal. Thirty-two participants performed cognitive reappraisal tasks to increase or decrease their emotions while viewing neutral and emotional (positive or negative) pictures. As a control task, the participants also simply viewed the pictures without an attempt...
Article
It has been demonstrated that recalibrations of audio-visual asynchrony are likely to occur in sensory processing rather than in the higher domains of cognition in the brain. The aim of the present study was to investigate recalibration of time perception to judge auditory and visual input simultaneity using a virtual environment (VE). A virtual co...
Article
Frontal asymmetric activation has been proposed to be the underlying mechanism for depression. Some case studies have reported that the enhancement of a relative right frontal alpha activity by an asymmetry neurofeedback training leads to improvement in depressive symptoms. In the present study, we examined whether a neurofeedback training designed...
Article
Full-text available
Although cholinergic mechanisms have been widely implicated in learning and memory processes, few studies have investigated the specific contribution of hippocampal cholinergic transmission during trace fear conditioning, a form of associative learning involving a temporal gap between two stimuli. Microinfusions of scopolamine, a muscarinic recepto...
Article
Full-text available
In the present study, we investigated the neural correlates underlying the perception of emotion in response to facial stimuli in order to elucidate the extent to which emotional perception is affected by the top-down process. Subjects performed a forced, two-choice emotion discrimination task towards ambiguous visual stimuli consisted of emotional...
Article
Full-text available
People with anxiety disorder display attentional bias toward threat-related objects. Using classical fear conditioning, the authors investigated the possible source of such bias in normal participants. Following differential fear conditioning in which an angry face of either male or female (conditioned stimulus: CS+) was paired with mild electric f...
Article
We tested whether N-methyl-D-aspartate (NMDA) receptors in the dorsal hippocampus (DH) are critical for the acquisition of trace fear conditioning using conditioned hypoalgesia (CHA), decrease in pain reactivity, as the conditioned response (CR) instead of commonly used freezing. Infusions of the NMDA receptor antagonist, DL-2-amino-5-phosphonovale...
Article
We examined the efficacy of a new method to reduce cybersickness. A real-time cybersickness detection system was constructed with an artificial neural network whose inputs were the electrophysiological signals of subjects in a virtual environment. The system was equipped with a means of feedback; it temporarily provided a narrow field of view and a...
Article
We investigated the importance and efficiency of active and passive exploration on the recognition of objects in a variety of virtual environments (VEs). In this study, 54 participants were randomly allocated into one of active and passive navigation conditions. Active navigation was performed by allowing participants to self-pace and control their...
Article
Despite its therapeutic success in treating mood-related disorders, little is known about the mechanism by which repetitive transcranial magnetic stimulation (rTMS) alters physiological responses of neurons. Using the forced swim test (FST) in rats as a model of depression, we tested the protective effect of rTMS on synaptic plasticity, specificall...
Article
We investigated the characteristic changes in the physiology of cybersickness when subjects were exposed to virtual reality. Sixty-one participants experienced a virtual navigation for a total of 9.5 min, and were required to detect specific virtual objects. Three questionnaires for sickness susceptibility and immersive tendency were obtained befor...
Article
Relationships between EEG and personality dimensions were investigated in the Korean population. Subjects were 68 healthy undergraduate students (32 males, 36 females). The Korean version of the Eysenck Personality Scales (EPS-Adult), Behavioral Inhibition System/Behavioral Approach System (BIS/BAS) scale, and Positive Affect and Negative Affect sc...
Article
We propose an automatic recognition method of Alzheimer's disease (AD) with single channel EEG recording using combined the genetic algorithms (GA) and the artificial neural network (ANN). Five min of the resting spontaneous EEG and the ERP in an auditory oddball task were recorded at P4 site in 16 early AD patients and 16 age-matched normal subjec...
Article
Calcium-mediated signaling is crucial for the synaptic plasticity and long-term memory storage, which requires de novo protein synthesis. Inositol 1,4,5-trisphosphate 3-kinase A (IP(3)K-A) is an enzyme, which is involved in the maintenance of intracellular calcium homeostasis by converting inositol 1,4,5-trisphosphate (IP(3)) to inositol 1,3,4,5-te...
Conference Paper
We propose an Alzheimer’s disease (AD) recognition method combined the genetic algorithms (GA) and the artificial neural network (ANN). Spontaneous EEG and auditory ERP data recorded from a single site in 16 early AD patients and 16 age-matched normal subjects were used. We made a feature pool including 88 spectral, 28 statistical and 2 nonlinear...
Article
Intradermal injection of capsaicin induces primary hyperalgesia at the injection site and secondary hyperalgesia in the surrounding undamaged skin. The secondary hyperalgesia is thought to be due to central sensitization of the dorsal horn neurons while primary hyperalgesia is caused by sensitization of nociceptors in the damaged skin. In this stud...
Article
Long-term depression (LTD) at parallel fibre-Purkinje cell synapse of the cerebellum is thought to be a cellular substrate for motor learning. LTD requires activation of metabotropic glutamate receptor subtype 1 (mGluR1) and its downstream signalling pathways, which invariably involves phospholipase Cbetas (PLCbetas). PLCbetas consist of four isofo...
Article
Full-text available
Rabbits with the electrolytic lesions of bilateral entorhinal cortex (EC) were trained with the hippocampal-dependent trace conditioning of the nictitating membrane response. The multiple-unit activity of the hippocampal CA1 region was recorded during conditioning. The conditioned stimulus was a tone (1 kHz, 85 dB, 200-ms duration), the uncondition...
Article
Haloperidol and clozapine have been widely used to alleviate schizophrenic symptoms, but their physiological effects in the prefrontal cortex (PFC) are not known. Effects of haloperidol and clozapine on single unit activity were investigated in the medial PFC of anesthetized rats. Injection (intraperitoneal) of haloperidol (1 mg/kg) or clozapine (2...
Conference Paper
Full-text available
This study is to develop the Alzheimer's disease (AD) detection and analysis system using event-related potential (ERP) of AD patients. We recorded ERP in an auditory oddball task in mild AD (n=25), severe AD (n=12), age-matched normal aged controls (n=17), and young controls (n=7). The amplitude and latency of target P3 components were compared am...
Article
Receptor subtype mediating the adrenergic sensitivity of pain behavior and ectopic discharges in neuropathic Lewis rats. We attempted to identify the subtype of alpha-adrenergic receptor (alpha-AR) that is responsible for the sympathetic (adrenergic) dependency of neuropathic pain in the segmental spinal injury (SSI) model in the Lewis strain of ra...
Article
Full-text available
1. The cerebellum and the hippocampus have been known to be neural structures involved in classical conditioning of the nictitating membrane response in rabbits. The neuronal activities related to conditioning are observed in both structures. It is uncertain, however, whether these conditioning-related neuronal activities are established in paralle...

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