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Articles by Wichian Sittiprapaporn
Total Records ( 21 ) for Wichian Sittiprapaporn
  Wichian Sittiprapaporn
  Speech and language are largely lateralized to the left cerebral hemisphere, while pragmatic competence appears to require an intact right hemisphere. Speech is known to be decoded in the brain by mechanisms engaging cortical areas within the left hemisphere, yet language experience may influence which brain circuitry is employed in processing auditory cues. The brain’s processing of information involves simultaneous activation of widely distributed neural networks. These networks allow large-scale parallel processing but also include points of convergence and sequential routing. The distribution and the time course of the momentary brain electric field topography offer a unique possibility to obtain insights into important features of the brain’s processing of information. The sequence of brain electric field topography represents the shift of the state of the brain from a representation of the input to a representation of the output. The empirical studies of human brain functional states for lexical tones processing in speech and language circumstances and experimental studies were then reviewed in order to reveal an effect of the spectral and temporal cues.
  Wichian Sittiprapaporn
  Theoretically, it has been possible to record the occipital Visual Evoked Potential (VEP) by working with non-invasive scalp electrodes. Similar to the Brainstem Auditory Evoked Response (BAER), which successfully addressed the same kind of problem in the auditory system; it will be necessary to adjust the clinical VEP recording protocols to adequately resolve the lateral geniculate bodies and superior colliculi along the bilaterally visual pathways. These are significantly lower amplitude and shorter-duration transitory synaptic events. Therefore, this study aims to purpose the technique to solve the clinical scalp evoked potential recordings for the sub-cortical, synaptic events occurring at the lateral geniculate bodies and superior colliculi along the bilaterally visual pathways.
  Wichian Sittiprapaporn
  Many design and interpretation in electroencephalography issues are unique to a given content area. Many principles apply to virtually all Electroencephalograms (EEGs), Evoked Potentials (EPs) and Event-Related Potentials (ERPs) studies and these common principles are the focus of this article. The central issues in the design and interpretation of EEGs, Fast Fourier Transforms (FFTs), Visual Evoked Potentials (Visual EPs), Auditory Evoked Potentials (Auditory EPs) and Auditory P300 Event-Related Potentials (Auditory P300 ERPs) testing have been discussed. This article discusses the principles of computerized electroencephalogram parameters recording protocol in relation to the file numbering system for all topographic brain mapping tests assigned by the Brain Atlas III (BA-III) module. Throughout the article, the most significant points are focus into a set of experimental paradigms done in the Electro-Neurophysiological Laboratory for designing and interpreting EEGs, FFTs, EPs, and ERPs tests.
  Wichian Sittiprapaporn
  Previous studies demonstrated that the processing of a longer vowel was mainly lateralized on the left hemisphere. However, some contradicting evidences employed speech sounds with shorter duration showed that the left hemispheric predominant mismatch negativity (MMN) was not systematically obtained. The main objective of this study is then to use the MMN to provide an index of long-term memory traces for duration of vowel changes with level tone in monosyllabic Thai words. Twenty-two healthy right-handed adults participated in this study. It was found that both long-to-short and short-to-long duration of vowels changes with level tone elicited MMN between 184-208 msec with reference to the standard-stimulus ERPs. The long-to-short duration changes with level tone elicited a strong MMN bilaterally for both native and nonnative speaker of Thai, unlike short-to-long duration change with level tone. The source of long-to-short duration changes was estimated to be located in the middle temporal gyrus of each hemisphere for both groups.
  Wichian Sittiprapaporn
  The main objective of the work reported here was to investigate the pre-attentive processing of changing from level tone to contour tone and vice versa. The long-to-short duration change with level-to-falling/rising and falling/rising-to-level tone changes perception elicited mismatch negativity (MMN) between 196-220 msec with reference to the standard-stimulus event-related potentials (ERPs). The long-to-short duration and level-to-falling/rising tone changes elicited a strong MMN bilaterally for both native and nonnative speakers of Thai, unlike short-to-long duration and falling/rising-to-level tone changes. Source localization analyses performed using LORETA-Key demonstrates that sources were obtained in the Middle Temporal Gyrus (MTG) of the left hemisphere and in the Superior Temporal Gyrus (STG) of the right hemisphere for both groups. The present study demonstrated that the grand enterprise of mapping language onto the human brain can be vitally enhanced by MMN studies.
  Wichian Sittiprapaporn
  Event-Related Potentials (ERPs) refers to the electrical events, specific to the cognitive activities of the brain that signal its task-related cognitive evaluation and decision-making processes following sensory input in various modalities. ERPs recording involve the use of a longer recording epoch following the stimulus, in order to record the subsequent cognitive activities. There are several types of cognitive ERPs including Contingent Negative Variation (CNV), Late Positive Complex (LPC or ‘P300’) and N400 (mismatch negativity), respectively. This article aims to demonstrate the auditory evoked potentials recording technique. Some examples of the cognitive event-related potentials testing done in the laboratory are also mentioned.
  Chayanon Awikunprasert and Wichian Sittiprapaporn
  This study aimed to determine the environment effect to the sleep efficiency of Thai children in Thailand. Participants in this study were investigated by using the Denver Development Screening Test (DDST) for measuring their usual development. The normal development participants were questioned about the sleep characteristics and were recorded the sleep log by their parents. The target population of this study was both male and female Thai children who were lived central part of Thailand. Data collection was conducted in a two-month period during February to March 2006. Twenty-seven Thai children were selected by purposive sampling. Sample size was 20-30 cases. The participants of this study were more girl (n = 79, 58.52%) than boy (n = 56, 41.48%). Their age ranged from 0-6 years with the mean and standard deviation of 3.19 and 0.50 years, respectively. More than half of the participants (n = 85, 62.97%) were 0-3 years. Regarding to the health status, the result of this study demonstrated that the health condition of the children’s emotion and behavior prior the experimental procedures. Generally, more than half of the participants did not have any illness or disconfirm one week prior the experiment and were not under frequent medical administration. Most of the participants had positive emotion and friendly or socialization. Sleep environment of the children at home was the main factor in which might influence the children’s sleeping behavior and attitude of following or postponing the bed time. The result of this study shows that the participants are easy awaked during sleep via the environmental influence. More importantly, it can be significantly altered the sleep cycle of the children and effect the results of the study.
  Wichian Sittiprapaporn
  The objective of this study was to investigate that the Mismatch Negativity (MMN) can be used to provide an index of experience-dependent and long-term memory traces for different vowel duration changes with contour tones in monosyllabic Thai words. Twenty-two healthy right-handed adults participated in this study. It was found that the long-to-short vowel duration with falling and rising tone changes elicited a strong MMN bilaterally for both native and nonnative speakers of Thai, unlike short-to-long vowel duration with falling and rising tone changes. Source localization analyses demonstrated that sources were obtained in the Middle Temporal Gyrus (MTG) of the left hemisphere and in the Superior Temporal Gyrus (STG) of the right hemisphere for both subject groups.
  Wichian Sittiprapaporn
  Mismatch Negativity (MMN) generally increased as a function of the degree of discrepancy from the standard-stimulus duration. The MMN generator is indeed sensitive to even very small amounts of stimulus energy. The main objective of this study was to investigate the cortical activation of level-to-contour tone changes in different vowel duration indexed by mismatch negativity. Twenty-two healthy right-handed adults participated in this study. It was found that the long-to-short vowel duration changes with level-to-falling/rising and falling/rising-to-level tone changes perception elicited MMN between 196-220 msec with reference to the standard-stimulus Event-related Potentials (ERPs). The long-to-short vowel duration and level-to-falling/rising tone changes elicited a strong MMN bilaterally for both native and nonnative speakers of Thai, unlike short-to-long vowel duration and falling/rising-to-level tone changes. Source localization analyses performed using Low Resolution Electromagnetic Tomography (LORETA) demonstrated that sources were obtained in the Middle Temporal Gyrus (MTG) of the left hemisphere and in the Superior Temporal Gyrus (STG) of the right hemisphere for both subject groups.
  Wichian Sittiprapaporn
  The aim of the present study was to investigate the human brain’s audiovisual integration mechanisms for letters, i.e., for stimuli that have been previously associated through learning. The subjects received audiovisual (AV) letters of the Chinese characters and were required to identify them, regardless of stimulus modality. The brain activations were detected with electroencephalogram (EEG), which is well suited for noninvasive identification of cortical activity and its accurate temporal dynamics. The present study was able to find evidence of both non-phonetic and phonetic audiovisual interactions in the Event-Related Potentials (ERPs) to the same AV stimuli. In addition, the differences in the ERPs to the meaningful and meaningless of AV stimuli probably reflect multisensory interactions in phonetic processing. When acoustic and visual phonemes were meaningful, they formed a natural multisensory interaction stimulus. The present study demonstrates that the audiovisual interaction is an indicator for investigating the automatic processing of suprasegmental information in tonal language. Multisensory integration of letters (orthography) and speech sounds of tonal language in the human auditory association cortex showed a strong dependency on the relative timing of the inputs. The critical role of input timing on multisensory integration has been demonstrated before at the neuronal level for naturally related visual and auditory signals.
  Wichian Sittiprapaporn
  Speech and language are largely lateralized to the left cerebral hemisphere, while pragmatic competence appears to require an intact right hemisphere. Speech is known to be decoded in the brain by mechanisms engaging cortical areas within the left hemisphere, yet language experience may influence which brain circuitry is employed in processing auditory cues. The brain’s processing of information involves simultaneous activation of widely distributed neural networks. These networks allow large-scale parallel processing but also include points of convergence and sequential routing. The distribution and the time course of the momentary brain electric field topography offer a unique possibility to obtain insights into important features of the brain’s processing of information. The sequence of brain electric field topography represents the shift of the state of the brain from a representation of the input to a representation of the output.
  Wichian Sittiprapaporn
  Musician’s brain is considered as an ideal model for plasticity studies: they start playing musical instrument usually in the early childhood and continue to improve their skills by practicing even when they have reached a professional level. Practicing to play involves accurate processing of temporal and spectral simple sounds as well as complex sounds or sound patterns. The result of long-term active and intensive music training does not affect only musical related skills and also in non-musical related skills i.e., verbal memory, mathematic and spatial ability. This review article cover music centre in the brain, musician brain in anatomical and functional aspects, enhancing of musical and non-musical related skills aspects, hypothesis of music and spatial ability and spatial mental imagery of music.
  Wichian Sittiprapaporn
  Mismatch Negativity (MMN) was used to investigate the processing of cluster and noncluster initial consonants in consonant-vowel syllables in the human brain. The MMN was elicited by either syllable with cluster or noncluster initial consonant, phonetic contrasts being identical in both syllables. Compared to the noncluster consonant, the cluster consonant elicited a more prominent MMN. The strong MMN peaks at ~128 msec after change onset in cluster-to-noncluster initial consonants changes and at ~212 msec in noncluster-to-cluster initial consonants changes. The significantly different neuronal populations were thus active between 128-212 msec when syllables with cluster and noncluster initial consonants were present. Microstate segmentation analyses showed that the phonological perception for cluster consonant was at 212 msec whereas 128 msec for non-cluster consonant. After approximately 220 msec, semantic perception started in order to perceive the meaning of the words.
  Wichian Sittiprapaporn
  Latency and amplitude figures for waveforms were picked at their point of maximal deflection as seen at their electrode site of maximal voltage distribution. The foregoing procedure for peak-picking was usually rather simple and straightforward for the early peaks. However for the Late Positive Complex (LPC) components due to their inherent but limited morphological identification had to be used in order not to confuse and admix together different LPC components from different subjects. Basically it is assumed that there are a maximum of three components in a person’s LPC which we call P3a, P300 and P3b. P3a is the earliest and P3b the latest such component while P300 falls somewhere in the middle usually assumed as the waveform’s center of gravity where a distinct peak cannot be ascertained. The range of LPC morphological variability which is seen in a general population including both healthy and sick people is then considered to represent a kind of gradient of LPC degeneration or deterioration and can be classified as such.
  Wichian Sittiprapaporn
  Electroencephalogram (EEG) source is within the cerebral cortex, large neural populations, all synchronized together to summate at the scalp surface. EEG signal recorded is the summation of the various neuronal populations beneath it and is a composite of various frequencies, designed Δ (0-3.5 Hz), θ (4-7 Hz), α (8-13 Hz) and β (13+ Hz). EEG is analyzed according to voltage, frequency, location, degree of symmetry and coherence between left and right hemispheres and specific waveform morphology and patterns. The International 10-20 System of Electrode Placement was introduced by Herbert Jasper in 1958 and adopted by the International Federation of EEG Societies and is currently in widespread use. Evoked Potentials (EP) are time-locked to the stimulus. Testing modalities and EP test types include: Auditory (BAER and AER), Visual (VER), Somatosensory (SER) and Cognitive (ERP). Quantified EEG includes Topographic Brain Mapping (TBM, BEAM) and Fast Fourier Transform (FFT) to analyze both EEG and EP data.
  Wichian Sittiprapaporn
  This study discusses some of the central issues in the design and interpretation of Electroencephalograms (EEGs), Fast Fourier Transforms (FFTs), Visual Evoked Potentials (Visual EPs), Auditory Evoked Potentials (Auditory EPs) and Auditory P300 Event-Related Potentials (Auditory P300 ERPs) tests. Many design and interpretation issues are unique to a given content area but many principles apply to virtually all EEGs, EPs and ERPs studies and these common principles are the focus of this study. The study begins with a discussion of the file numbering system for all topographic brain mapping tests assigned by the Brain Atlas III (BA-III). It then discusses the principles of design and interpretation. Throughout the study, the most significant points are distilled into a set of paradigms for designing and interpreting EEGs, FFTs, EPs and ERPs tests.
  Wichian Sittiprapaporn
  It remains unclear whether there is an analogous automatic deviant-related negativity elicited outside the auditory modality even though the MMN can be elicited in auditory modality. The present study employed simultaneous audio-visual stimulus in the oddball paradigm to re-examine the effects of attention on visual mismatch negativity in audiovisual perception. The electrical brain activities were recorded from normal, from normal participants subjects. Stimuli consisted of a set of four audio-visual stimuli that are distinguished by frequencies (Hz) for audio and features for visual appearing on the computer screen. ANOVA showed statistically significant of the interaction between electrode site and modality. The difference waves with 100-200 msec latency at the anterior sites were markedly different to the posterior sites. The emergence of posterior negativity in the audio-visual modality might not be attributed to visual discrimination process as it did not appear in the visual modality.
  Wichian Sittiprapaporn
  The main objective of the research reported here is to investigate the preattentive processing of changing from level tone to contour tone and vice versa. The long to short duration change with level to falling/rising and falling/rising to level tone changes perception elicited MMN between 196-220 msec with reference to the standard-stimulus ERPs. The long to short duration and level to falling/rising tone changes elicited a strong MMN bilaterally for both native and nonnative speakers of Thai, unlike short to long duration and falling/rising to level tone changes. Source localization analyses performed using LORETA-Key demonstrates that sources were obtained in the Middle Temporal Gyrus (MTG) of the left hemisphere and in the Superior Temporal Gyrus (STG) of the right hemisphere for both groups. The present study demonstrated that the grand enterprise of mapping language onto the human brain can be vitally enhanced by MMN studies.
  Chayanon Awikunprasert , Naruephon Vongjaturapat , Fuzhong Li and Wichian Sittiprapaporn
  World Health Organization has estimated that there will be an increasing number of deaths from cancer in the near future. Cancer has become one of the most discussed topics in medicine and science. In this study, researchers focus on the quality of life of cancer patients by using music and exercise therapies and to observe the difference between pre-test and post-test results with music and exercise treatments. The aim of the study is to examine the alternative therapies using of music and exercise programs to enhance the quality of life, using the hospice quality of life index-revised in cancer patients. Twenty one cancer patients were divided into four different groups; the control group followed their routine schedules; the music group received additional music therapy with a music leader; the exercise group participated in an exercise program under supervision of a professional trainer and a group who received a combination of music therapy and an exercise program on the same day. The results from both questionnaires, collected during 4th, 8th and 12th week, showed that the music and exercise group had the most significant improvement compared to the other three groups. This suggested that the combination of music and exercise has the most potential to increase the quality of life for the cancer patients. It can be concluded that the music and exercise treatment is a good model to improve both psychological and physiological conditions. The treatment can also be used in general clinics or hospitals as an alternative treatment for cancer patients.
  Wichian Sittiprapaporn
  The main objective of this study is to use the Mismatch Negativity (MMN) to provide an index of experience-dependent and long-term memory traces for duration of vowel changes with level tone in monosyllabic Thai words. About twenty two healthy right-handed adults participated in this study. It was found that both long to short and short to long duration of vowels changes with level tone elicited MMN between 184-208 msec with reference to the standard-stimulus ERPs. The long to short duration changes with level tone elicited a strong MMN bilaterally for both native and nonnative speaker of Thai unlike short to long duration change with level tone. The source of long to short duration changes was estimated to be located in the middle temporal gyrus of each hemisphere for both groups.
  Wichian Sittiprapaporn
  As both hemispheres are lateralized for speech and language, the objective of this study is to extend the investigation of how the preattentive processing of contour tone changes in Thai monosyllabic words. Twenty two healthy right handed adults participated in this study. This study found that both rising to falling and falling to rising tone changes perception elicited MMN between 212-244 msec with reference to the standard-stimulus ERPs. The rising to falling and falling to rising tone changes elicited a strong MMN bilaterally for native and nonnative speakers of Thai. Source localization was obtained in the Middle Temporal Gyrus (MTG) of the left hemisphere and in the Superior Temporal Gyrus (STG) of the right hemisphere for both groups. Automatic detection of changes in contour tones is a useful index of language universal auditory memory traces.
 
 
 
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