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3. Investigation of daily patterns for smartphone keystroke dynamics based on loneliness and social isolation

Author

Lim, Seokbeen, Kim, Chaeyeon, Cho, Baek Hwan, Choi, Soo-Hee, Lee, Hyeongrae, and Jang, Dong Pyo

Abstract

This study examined the relationship between loneliness levels and daily patterns of mobile keystroke dynamics in healthy individuals. Sixty-six young healthy Koreans participated in the experiment. Over five weeks, the participants used a custom Android keyboard. We divided the participants into four groups based on their level of loneliness (no loneliness, moderate loneliness, severe loneliness, and very severe loneliness). The very severe lonelinessgroup demonstrated significantly higher typing counts during sleep time than the other three groups (one-way ANOVA, F= 3.75, p< 0.05). In addition, the average cosine similarity value of weekday and weekend typing patterns in the very severe lonelinessgroup was higher than that in the no lonelinessgroup (Welch’s t-test, t= 2.27, p< 0.05). This meant that the no lonelinessgroup’s weekday and weekend typing patterns varied, whereas the very severe lonelinessgroup’s weekday and weekend typing patterns did not. Our results indicated that individuals with very high levels of loneliness tended to use mobile keyboards during late-night hours and did not significantly change their smartphone usage behavior between weekdays and weekends. These findings suggest that mobile keystroke dynamics have the potential to be used for the early detection of loneliness and the development of targeted interventions.

Published
2023
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19. Regional cerebral blood flow changes and performance deficit during a sustained attention task in schizophrenia: 15 O- water positron emission tomography.

Author

Seok, Jeong‐Ho, Park, Hae‐Jeong, Lee, Jong‐Doo, Kim, Hye‐Sun, Chun, Ji‐Won, Son, Sang Joon, Oh, Maeng‐Keun, Ku, Jeonghun, Lee, Hyeongrae, and Kim, Jae‐Jin

Subjects
CEREBRAL circulation, POSITRON emission tomography, PEOPLE with schizophrenia, PEOPLE with mental illness, BLOOD circulation
Abstract

Aim Attention deficit has been reported in both schizophrenia patients and patients with major depressive disorder (MDD). The aim of this study was to elucidate the deficits in sustained attention and associated neural network dysfunctions in schizophrenia patients and MDD patients, and to investigate the difference between the two patient groups. Methods Twelve schizophrenia patients, 12 patients with non-psychotic MDD, and 12 healthy control subjects participated in this study. A sustained attention to response task ( SART) was used to measure attention capacity. Cerebral blood flow ( CBF) during attention tasks was measured using H215O positron emission tomography. Statistical parametric mapping and analysis of covariance were performed to compare the behavioral performance and CBF changes during SART among three groups. Results Behavioral performances were not significantly different among the three groups except for an increased commission error rate in the schizophrenia group. Regional CBF during SART was significantly reduced in the left inferior frontal gyrus, the left cuneus, and the right superior parietal lobule and increased in the right superior frontal gyrus and the right cuneus in the schizophrenia group compared to the healthy control group. In the MDD group, neither significant regional CBF difference nor behavioral deficit was found compared to the healthy control group. Conclusion Behavioral performance deficit and perfusion changes in the prefrontal and parietal cortices during SART were observed only in the schizophrenia group. Prefrontal and parietal network dysfunction for sustained attention may be involved in the pathophysiology of schizophrenia. [ABSTRACT FROM AUTHOR]

Published
2012
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20. Regional cerebral blood flow changes and performance deficit during a sustained attention task in schizophrenia: (15) O-water positron emission tomography.

Author

Seok JH, Park HJ, Lee JD, Kim HS, Chun JW, Son SJ, Oh MK, Ku J, Lee H, and Kim JJ

Subjects
Adult, Brain diagnostic imaging, Brain Mapping, Depression diagnostic imaging, Depression physiopathology, Depression psychology, Female, Humans, Male, Nerve Net diagnostic imaging, Neuropsychological Tests, Psychomotor Performance physiology, Radionuclide Imaging, Schizophrenia diagnostic imaging, Schizophrenic Psychology, Attention physiology, Brain physiopathology, Cerebrovascular Circulation physiology, Nerve Net physiopathology, Schizophrenia physiopathology
Abstract

Aim: Attention deficit has been reported in both schizophrenia patients and patients with major depressive disorder (MDD). The aim of this study was to elucidate the deficits in sustained attention and associated neural network dysfunctions in schizophrenia patients and MDD patients, and to investigate the difference between the two patient groups., Methods: Twelve schizophrenia patients, 12 patients with non-psychotic MDD, and 12 healthy control subjects participated in this study. A sustained attention to response task (SART) was used to measure attention capacity. Cerebral blood flow (CBF) during attention tasks was measured using H(2) (15) O positron emission tomography. Statistical parametric mapping and analysis of covariance were performed to compare the behavioral performance and CBF changes during SART among three groups., Results: Behavioral performances were not significantly different among the three groups except for an increased commission error rate in the schizophrenia group. Regional CBF during SART was significantly reduced in the left inferior frontal gyrus, the left cuneus, and the right superior parietal lobule and increased in the right superior frontal gyrus and the right cuneus in the schizophrenia group compared to the healthy control group. In the MDD group, neither significant regional CBF difference nor behavioral deficit was found compared to the healthy control group., Conclusion: Behavioral performance deficit and perfusion changes in the prefrontal and parietal cortices during SART were observed only in the schizophrenia group. Prefrontal and parietal network dysfunction for sustained attention may be involved in the pathophysiology of schizophrenia., (© 2012 The Authors. Psychiatry and Clinical Neurosciences © 2012 Japanese Society of Psychiatry and Neurology.)

Published
2012
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