• Journal of Korean Library and Information Science Society
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• v.48 no.3
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• pp.281-302
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• 2017

This study examined the differences in a searcher's mental states of a complex information search and retrieval task during information search process between the two groups: participants who were exposed to mental demand manipulation and those not exposed. Data from the experiments and questionnaires were analyzed. Based on qualitative approach and quantitative analyses, the results indicated that the participants exposed to mental demand required more thoughts; addressed negative emotions more often; reduced a searcher's efforts; and interrupted search performance than those not exposed. These results suggest that mental demand contributed to a searcher's perceived thought, emotion, effort, and performance, although these mental states differed in relative contribution of information search process. Significant differences were found between the two groups with respect to the component of mental demand, performance, and frustration of the NASA-TLX subjective cognitive load. These results have implications for search user interface design and information search systems among others.

• Journal of the Korean Home Economics Association
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• v.40 no.6
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• pp.213-221
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• 2002

This study investigated talk about mental states in pretend play, to whom mental states were attributed, and function of mental-state terms. Also, frequency of mental-state terms of pretend versus non-pretend turns was examined. Thirty 4 year old preschoolers, each paired with a self-chosen peer, were observed and videotaped during a 20-minute play session. The observations presented the following conclusions: Knowing and pretending were the most frequently expressed. Children attributed a large proportion of mental state to themselves. The mental-state terms were used to refer his or another's thoughts and beliefs, to direct interaction, and to attract the other child's attention. Mental-state talk occurred within pretend more often than within non-pretend turns.

• Proceedings of the IEEK Conference
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• 2001.06e
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• pp.61-64
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• 2001

This paper describes a basic study for the classification of cognitive mental states as a basic research of a human-computer interface technique. To recognize the mental states, we obtained 22 subjects’brain waves in course of two types of experiments. One of the experiments is to choose an answer among yes, no or reject buttons, to underlying questions and the other is to select an icon displayed in a monitor screen. After acquiring the brain wave signals, we construct a feature set with the percent power increase for a given segment with respect to that of the reference period. The linear discriminative algorithm is used to classify the cognitive yes/no mental states.

• CELLMED
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• v.2 no.3
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• pp.28.1-28.4
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• 2012

There were no studies available measuring the ability to follow instructions for meditation. Hence, the present study was planned to assess the ability to follow instructions for the four mental states viz., cancalata (random thinking), ekagrata (non-meditative concentration), dharana (focused meditation) and dhyana (defocused meditation or effortless meditation) described in yoga texts. Sixty male volunteers with ages ranging from 18 to 31 years (group mean age ${\pm}$ S.D., $22.78{\pm}2.73$) participated in the study. They were assessed using a visual analog scale immediately after each of the four states on four different days. The results showed that following dharana, scores on the visual analog scale were significantly lower compared to those related to cancalata, ekagrata and dhyana. Hence, dharana is the most difficult of the four states.

• Health Policy and Management
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• v.10 no.3
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• pp.88-107
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• 2000

The Alcoholics Anonymous(AA) program has been known to be effective in many countries in helping alcoholics to stop drinking and to change their attitudes, beliefs, and behaviors. In this study, we examined AA activities among Korean AA members and measured the self-evaluated physical, social, and mental changes following the entry into the AA program. Out of identified 300 AA members who were attending 18 different AA group meetings at the time of the survey, 207 completed the self-administered questionnaire(response rate of 69.0%). T-test and ANOVA were used to compare the scores of physica(4-items), social(4-items), and menta(10-items) changes according to the level of AA activities. The proportion of the respondents who practiced the 11th step (meditation) or the 12th step (take alcoholics to a meeting after carrying messages) on the regular basis was 66.6% and 37.2%, respectively. The average time spent in meditation per week was $4.8{\pm}5.47$ hours. The length of participation in AA meetings has significantly positive impact on the average score of changes in all the 3 health states; physical(p<.01), social(p<.05), and mental states(p<.01). Also, practicing the 11th step was significantly associated with improvement of social(p<.01) and mental(p<.05), while practicing the 12th step improved only mental states(p<.01). Our findings demonstrated that not only the length of participation in AA meetings but also the practice of regular meditation(11th step) and taking alcoholics to an AA meeting after carrying messages(12th step) are very important for AA members, and lead to great positive changes in physical, social, and mental states following entry into the AA program.

• Journal of Biomedical Engineering Research
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• v.33 no.1
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• pp.15-24
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• 2012

Classification of human thought is an emerging research field that may allow us to understand human brain functions and further develop advanced brain-computer interface (BCI) systems. In the present study, we introduce a new approach to classify various mental states from noninvasive electrophysiological recordings of human brain activity. We utilized the full spatial and spectral information contained in the electroencephalography (EEG) signals recorded while a subject is performing a specific mental task. For this, the EEG data were converted into a 2D spatiospectral pattern map, of which each element was filled with 1, 0, and -1 reflecting the degrees of event-related synchronization (ERS) and event-related desynchronization (ERD). We evaluated the similarity between a current (input) 2D pattern map and the template pattern maps (database), by taking the inner-product of pattern matrices. Then, the current 2D pattern map was assigned to a class that demonstrated the highest similarity value. For the verification of our approach, eight participants took part in the present study; their EEG data were recorded while they performed four different cognitive imagery tasks. Consistent ERS/ERD patterns were observed more frequently between trials in the same class than those in different classes, indicating that these spatiospectral pattern maps could be used to classify different mental states. The classification accuracy was evaluated for each participant from both the proposed approach and a conventional mental state classification method based on the inter-hemispheric spectral power asymmetry, using the leave-one-out cross-validation (LOOCV). An average accuracy of 68.13% (${\pm}9.64%$) was attained for the proposed method; whereas an average accuracy of 57% (${\pm}5.68%$) was attained for the conventional method (significance was assessed by the one-tail paired $t$-test, $p$ < 0.01), showing that the proposed simple classification approach might be one of the promising methods in discriminating various mental states.

• Journal of Korean society of Dental Hygiene
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• v.2 no.2
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• pp.187-200
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• 2002

The purpose of this study was to obtain the basic data provide continuous and active dental treatment for the mental handicapped children. The authors studied on the dental caries experience, oral hygiene slates and caries activity test in the mental handicapped children of 9-11 years old, who are housed by rehabilitation school in Kwang-ju and in the 30 normal children of 9-11 years old as a control group. Correlation coefficiency was calculated among the caries experience, oral hygiene states and caries activity test for every children. The obtained results are as follows. 1. The mental handicapped children showed remarkably high score compared to normal children in DMFT index(The Index score was $2.43{\pm}1.98$ in the normal children and $5.26{\pm}4.11$ in the mental handicapped.). 2. Correlation coefficiency was reveled very high score between DT index and DMFT index of the normal children(P<0.01), and the mental handicapped was also high score(P<0.01) between ft index and dmft index. 3. The PMA Index of the mental handicapped children was comparatively higher than the normal(The Index score was $4.03{\pm}4.44$ in the normal children and $7.87{\pm}7.33$ in the mental handicapped.). 4. In the correlation coefficiency between the caries experience and modified snyder test, DMFT index of the normal children was revealed some high score(P<0.05). DMFT index of the mental handicapped was showed remarkably high score(P<0.01).

• Korean Journal of Child Studies
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• v.30 no.6
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• pp.567-581
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• 2009

This study examined 10 Korean children's expressions of the mental states of desires and beliefs by analyzing mental state verbs as well as modal expressions in Korean production data. Mental expressions of desires and beliefs increased with increasing age. Two transition points of desires and beliefs were found in the data. First, belief expressions were less frequently produced than expressions of desires between 23 to 32 months. Second, belief expressions were much the same as desire expressions from 33 to 44 months. Finally, belief expressions were more frequently produced than desire expressions between 45 to 76 months. The authors suggest that these developmental transitions represent a conceptual change in understanding of mental states as proposed by Wellman (1990).

• Korean Journal of Child Studies
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• v.29 no.1
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• pp.257-273
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• 2008

This study examined the development of children's theory of mind by types of false-belief tasks and various mental states. Seventy six 3-, 4-, 5- and 6-year olds were asked to infer others' minds or choose other's behaviors. Ten tasks, including two picture book tasks, were used to tap the children's understanding of various mental states. Results showed that children did well in their understanding of diverse perception and desire, but they did poorly in emotional inference based on false-belief, and second order false-belief. Children performed better in picture book tasks than in classical tasks for the understanding of false-belief and false-belief based emotion.

• International Journal of Fuzzy Logic and Intelligent Systems
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• v.10 no.1
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• pp.37-42
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• 2010

Final year students are normally encountering high pressing in their study. In view of this fact, this research focuses on determining mental states condition of college student in final year based on the psycho-physiological information. The experiments were conducted in two times, i.e., prior- and post- graduation seminar examination. The early results indicated that the student profile of mood states (POMS) in prior final graduation seminar showed higher scores than students in post final graduation seminar. Thus, in this research, relation between biosignal representing by heart rate variability (HRV) and questionnaire responses were evaluated by hidden Markov model (HMM) and neural networks (NN).