Browsing by Author "Liu, Tai-Ying"

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Asymmetric Engagement of Amygdala and Its Gamma Connectivity in Early Emotional Face Processing
(2015-01-28)
Liu, Tai-Ying
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Chen, Yong-Sheng
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Hsieh, Jen-Chuen
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Chen, Li-Fen
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資訊工程學系
The amygdala has been regarded as a key substrate for emotion processing. However, the engagement of the left and right amygdala during the early perceptual processing of different emotional faces remains unclear. We investigated the temporal profiles of oscillatory gamma activity in the amygdala and effective connectivity of the amygdala with the thalamus and cortical areas during implicit emotion-perceptual tasks using event-related magnetoencephalography (MEG). We found that within 100 ms after stimulus onset the right amygdala habituated to emotional faces rapidly (with duration around 20-30 ms), whereas activity in the left amygdala (with duration around 50-60 ms) sustained longer than that in the right. Our data suggest that the right amygdala could be linked to autonomic arousal generated by facial emotions and the left amygdala might be involved in decoding or evaluating expressive faces in the early perceptual emotion processing. The results of effective connectivity provide evidence that only negative emotional processing engages both cortical and subcortical pathways connected to the right amygdala, representing its evolutional significance (survival). These findings demonstrate the asymmetric engagement of bilateral amygdala in emotional face processing as well as the capability of MEG for assessing tha-lamo-cortico-limbic circuitry.
Different patterns of abnormal gamma oscillatory activity in unipolar and bipolar disorder patients during an implicit emotion task
(2012-06-01)
Liu, Tai-Ying
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Hsieh, Jen-Chuen
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Chen, Yong-Sheng
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Tu, Pei-Chi
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Su, Tung-Ping
This study investigates the distinct patterns of local and long-range gamma oscillations between patients with bipolar disorder (BD) and major depressive disorder (MDD). Twenty BD patients, twenty MDD patients, and twenty normal controls participated in this study. For each participant, the event-related magnetoencephalographic responses while performing an implicit emotional task were recorded and processed with time-frequency analysis. Compared to normal controls, the BD patients exhibited the gamma power decease at the right frontal and prefrontal regions and yet gamma power increase at the right posterior temporal region. The abnormal long-range gamma oscillation between the right frontal and parietal-occipital region was also found. These results indicate that the BD patients may have hyperactivity in perceptual binding of emotional features and tend to be oversensitive to facial features. On the other hand, MOD patients displayed increased early gamma activity at the left anterior temporal region, which may imply their hyperactivated binding process of emotional features at corticolimbic regions. The distinct alterations of gamma patterns between the BD and MDD patients implicate that their impairments of binding processes are located at different regions. Gamma activity in the parietal and left posterior temporal regions may be a potential index to differentiate BD patients from MDD patients. (C) 2012 Elsevier Ltd. All rights reserved.
HARDWARE-SOFTWARE CODESIGN FOR HIGH-SPEED SIGNATURE-BASED VIRUS SCANNING
(2009-09-01)
Lin, Ying-Dar
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Lin, Po-Ching
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Lai, Yuan-Cheng
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Liu, Tai-Ying
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資訊工程學系
HIGH-SPEED NETWORK CONTENT SECURITY APPLICATIONS OFTEN OFFLOAD SIGNATURE MATCHING TO HARDWARE. IN SUCH SYSTEMS, THE THROUGHPUT OF THE OVERALL SYSTEM, RATHER THAN THE HARDWARE ENGINE ALONE, IS SIGNIFICANT. THE AUTHORS OFFLOAD VIRUS SCANNING IN THE CLAMAV ANTIVIRUS PACKAGE TO THE BFAST* HARDWARE ENGINE. THEY FIND THAT THE DATA-PASSING PROCESSES SIGNIFICANTLY DEGRADE SYSTEM THROUGHPUT.