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Oxytocin Receptor Gene Polymorphism and Brain Activity
( Damee Choi ),( Natsumi Minote ),( Fumi Kishida ),( Shigeki Watanuki ) 한국감성과학회 2015 추계학술대회 Vol.2015 No.-
Oxytocin is an important neuroactive hormone for social behaviors. Previous studies have reported that genetic variation in the oxytocin receptor is associated with individual differences in response to social cues. However, it remains unclear whether the oxytocin receptor gene modulates responses to nonsocial cues, such as inanimate objects. Therefore, in the present study, we investigated the relationship between the oxytocin receptor gene rs53576 and event-related potential (ERP) responses evoked by watching images depicting either humans or inanimate objects. Eighty-three Japanese men (GG, n = 10; GA, n = 43; AA, n = 30) participated in this study. We found that GG/GA individuals displayed greater N1 and early posterior negativity (EPN) than AA individuals regardless of image content (human or object). This suggests that GG/GA individuals have a tendency to respond to emotional stimuli more automatically than AA individuals, even when stimuli do not contain social cues. GG/GA individuals also showed higher self-reported trait empathy, in accordance with previous studies. These results suggest that genetic variation in the oxytocin receptor gene might account for individual differences in emotional processing of both social cues and nonsocial cues. In conclusion, our findings suggest that genetic variation in the oxytocin receptor gene modulates a wide range of social and emotional behaviors.
Effect of Empathy Trait on Attention to Faces: Evidence from N170
( Damee Choi ),( Takayuki Nishimura ),( Midori Motoi ),( Yuka Egashira ),( Riko Matsumoto ),( Shigeki Watanuki ) 한국감성과학회 2014 춘계학술대회 Vol.2014 No.-
To extend knowledge of relationship between empathy trait and attention to face, the present study aimed at investigating relationship between self-reported empathy trait and N170 elicited by five facial expressions (happy, angry, surprised, afraid, and sad). Twenty-two participants (12 males and 10 females) discriminated those five facial expressions from emotionally neutral faces under an oddball paradigm while event-related potentials (ERP) were recorded. The empathy trait of participants was measured using the Interpersonal Reactivity Index (IRI, Davis, 1980). The results revealed that participants with high IRI score showed more negative amplitude of N170 (140 to 200 ms after stimulus onset) than those with low IRI score at posterior temporal area in response to happy, angry, surprised, and afraid faces. The present study thus suggests that people with high empathy trait pay attention to faces more than those with low empathy, in very early stage of processing of face with happy, angry, surprised, and afraid expressions. Furthermore, this also indicates that empathy trait is related with attention processing of not only negative expressions (angry and afraid) but also positive (happy) and ambiguous expression (surprised).
Effect of empathy trait on attention to faces
Damee Choi,Takayuki Nishimura,Midori Motoi,Yuka Egashira,Riko Matsumoto,Shigeki Watanuki 대한인간공학회 2014 대한인간공학회 학술대회논문집 Vol.2014 No.5
To extend knowledge of relationship between empathy trait and attention to face, the present study aimed at investigating relationship between self-reported empathy trait and N170 elicited by five facial expressions (happy, angry, surprised, afraid, and sad). Twenty-two participants (12 males and 10 females) discriminated those five facial expressions from emotionally neutral faces under an oddball paradigm while event-related potentials (ERP) were recorded. The empathy trait of participants was measured using the Interpersonal Reactivity Index (IRI, Davis, 1980). The results revealed that participants with high IRI score showed more negative amplitude of N170 (140 to 200 ms after stimulus onset) than those with low IRI score at posterior temporal area in response to happy, angry, surprised, and afraid faces. The present study thus suggests that people with high empathy trait pay attention to faces more than those with low empathy, in very early stage of processing of face with happy, angry, surprised, and afraid expressions. Furthermore, this also indicates that empathy trait is related with attention processing of not only negative expressions (angry and afraid) but also positive (happy) and ambiguous expression (surprised).
TRIGONOMETRIC PARALLAXES OF STAR FORMING REGIONS IN THE PERSEUS SPIRAL ARM
Choi, Y. K.,Hachisuka, K.,Reid, M. J.,Xu, Y.,Brunthaler, A.,Menten, K. M.,Dame, T. M. IOP Publishing 2014 The Astrophysical journal Vol.790 No.2
<P>We report trigonometric parallaxes and proper motions of water masers for 12 massive star forming regions in the Perseus spiral arm of the Milky Way as part of the Bar and Spiral Structure Legacy (BeSSel) Survey. Combining our results with 14 parallax measurements in the literature, we estimate a pitch angle of 9 degrees.9 +/- 1 degrees.5 for a section of the Perseus arm. The three-dimensional Galactic peculiar motions of these sources indicate that on average they are moving toward the Galactic center and slower than the Galactic rotation.</P>
Li, Daming,Deng, Lianbing,Bhooshan Gupta, Brij,Wang, Haoxiang,Choi, Chang Elsevier science 2019 Information sciences Vol.479 No.-
<P><B>Abstract</B></P> <P>The rise of machine learning increases the current computing capabilities and paves the way to novel disruptive applications. In the current era of big data, the application of image retrieval technology for large-scale data is a popular research area. To ensure the robustness and security of digital image watermarking, we propose a novel algorithm using synergetic neural networks. The algorithm first processes a meaningful gray watermark image, then embeds it as a watermark signal into the block Discrete Cosine Transform (DCT) component. The companion algorithm for detection and extraction of the watermark uses a cooperative neural network, where the suspected watermark signal is used as the input while the output consists in the result of the recognition process. The simulation experiments show that the algorithm can complete certain image processing operations with improved performance, not only simultaneously completing watermark detection and extraction, but also efficiently determining the watermark attribution. Compared with other state-of-the-art models, the proposed model obtains an optimal Peak Signal-to-noise ratio (PSNR).</P>
( Tae Hyeon Park ),( Chang-yun Choi ),( Hyeon Jin Kim ),( Jeong-rok Song ),( Damee Park ),( Hyun Ah Kang ),( Tae-jip Kim ) 한국미생물생명공학회(구 한국산업미생물학회) 2021 Journal of microbiology and biotechnology Vol.31 No.2
Two genes encoding probable α-L-arabinofuranosidase (E.C. 3.2.1.55) isozymes (ABFs) with 92.3% amino acid sequence identity, ABF51A and ABF51B, were found from chromosomes 3 and 5 of Saccharomycopsis fibuligera KJJ81, an amylolytic yeast isolated from Korean wheat-based nuruk, respectively. Each open reading frame consists of 1,551 nucleotides and encodes a protein of 517 amino acids with the molecular mass of approximately 59 kDa. These isozymes share approximately 49% amino acid sequence identity with eukaryotic ABFs from filamentous fungi. The corresponding genes were cloned, functionally expressed, and purified from Escherichia coli. SfABF51A and SfABF51B showed the highest activities on p-nitrophenyl arabinofuranoside at 40~45oC and pH 7.0 in sodium phosphate buffer and at 50oC and pH 6.0 in sodium acetate buffer, respectively. These exoacting enzymes belonging to the glycoside hydrolase (GH) family 51 could hydrolyze arabinoxylooligosaccharides (AXOS) and arabino-oligosaccharides (AOS) to produce only L-arabinose, whereas they could hardly degrade any polymeric substrates including arabinans and arabinoxylans. The detailed product analyses revealed that both SfABF51 isozymes can catalyze the versatile hydrolysis of α-(1,2)- and α-(1,3)-L-arabinofuranosidic linkages of AXOS, and α-(1,2)-, α-(1,3)-, and α-(1,5)- linkages of linear and branched AOS. On the contrary, they have much lower activity against the α- (1,2)- and α-(1,3)-double-substituted substrates than the single-substituted ones. These hydrolases could potentially play important roles in the degradation and utilization of hemicellulosic biomass by S. fibuligera.
Tae Hyeon Park,Chang-Yun Choi,Jeong-Rok Song,Damee Park,Tae-Jip Kim 한국당과학회 2021 한국당과학회 학술대회 Vol.2021 No.01
From the genome of Lactobacillus shenzhenensis, the probable genes encoding five α -L-arabinofuranosidases (AF, EC3.2.1.55) and an β-L-arabinopyranosidase (AP, EC3.2.1.88) were found and cloned in Escherichia coli. Except LbshAF-B1, five genes were functionally expressed and characterized in this study. The comparative studies on the hydrolytic modes of action revealed that these exo-hydrolases can play the important roles in the enzymatic saccharification of arabinan polymers into L-arabinose. LbshAF-A GH51 could hydrolyze both α-(1,5)- and α-(1,2)/(1,3)-linkages in arabinan. LbshAF-B2 GH51 showed only α-(1,2)/(1,3)-specific debranching activity to generate linear products, whereas LbshAF-C1 and C2 GH43 could exclusively hydrolyze α-(1,5)-linked arabinan backbone. LbshAP showed the activity against p-nitrophenyl arabinopyranoside. It was proposed that the synergistic actions of these exo-hydrolases can facilitate the complete degradation of sugar beet arabinan to L-arabinose.
Effect of emotional arousal on inter-temporal decision-making: an fMRI study
Sohn, Jin-Hun,Kim, Hyo-Eun,Sohn, Sunju,Seok, Ji-Woo,Choi, Damee,Watanuki, Shigeki BioMed Central 2015 Journal of Physiological Anthropology Vol.34 No.1
<P><B>Background</B></P><P>Previous research has shown that emotion can significantly impact decision-making in humans. The current study examined whether or not and how situationally induced emotion influences people to make inter-temporal choices.</P><P><B>Methods</B></P><P>Affective pictures were used as experiment stimuli to provoke emotion, immediately followed by subjects’ performance of a delay-discounting task to measure impulsivity during functional magnetic resonance imaging.</P><P><B>Results</B></P><P>Results demonstrate a subsequent process of increased impulsive decision-making following a prior exposure to both high positive and negative arousal stimuli, compared to the experiment subjects’ experiences with neutral stimuli. Findings indicate that increased impulsive decision-making behaviors can occur with high arousal and can be characterized by decreased activities in the cognitive control regions such as prefronto-parietal regions.</P><P><B>Conclusions</B></P><P>These results suggest that ‘stabilization of high emotional arousal’ may facilitate a reduction of impulsive decision-making and implementation of longer term goals.</P>