國家衛生研究院 NHRI:Item 3990099045/14352
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    Please use this identifier to cite or link to this item: http://ir.nhri.org.tw/handle/3990099045/14352


    Title: Left frontotemporal region plays a key role in letter fluency task-evoked activation and functional connectivity in normal subjects: A functional near-infrared spectroscopy study
    Authors: Tung, H;Lin, WH;Hsieh, PYF;Lan, TH;Chiang, MC;Lin, YY;Peng, SJ
    Contributors: Center for Neuropsychiatric Research
    Abstract: Letter fluency task (LFT) is a tool that measures memory, executive function, and language function but lacks a definite cutoff value to define abnormalities. We used the optical signals of functional near-infrared spectroscopy (fNIRS) to study the differences in power and connectivity between the high-functioning and low-functioning participants while performing three successive LFTs, as well as the relationships between the brain network/power and LFT performance. We found that the most differentiating factor between these two groups was network topology rather than activation power. The high-functional group (7 men and 10 women) displayed higher left intra-hemispheric global efficiency, nodal strength, and shorter characteristic path length in the first section. They then demonstrated a higher power over the left Broca's area than the right corresponding area in the latter two sections. The low-LFT group (9 men and 11 women) displayed less left-lateralized connectivity and activation power. LFT performance was only related to the network topology rather than the power values, which was only presented in the low-functioning group in the second section. The direct correlation between power and connectivity primarily existed in the inter-hemispheric network, with the timing relationship also seeming to be present. In conclusion, the high-functioning group presented more prominent left-lateralized intra-hemispheric network connectivity and power activation, particularly in the Broca's area. The low-functioning group seemed to prefer using other networks, like the inter-hemispheric, rather than having a single focus on left intra-hemispheric connectivity. The network topology seemed to better reflect the LFT performance than did the power values.
    Date: 2022-05-20
    Relation: Frontiers in Psychiatry. 2022 May 20;13:Article number 810685.
    Link to: http://dx.doi.org/10.3389/fpsyt.2022.810685
    JIF/Ranking 2023: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=NHRI&SrcApp=NHRI_IR&KeyISSN=1664-0640&DestApp=IC2JCR
    Cited Times(WOS): https://www.webofscience.com/wos/woscc/full-record/WOS:000806661200001
    Cited Times(Scopus): https://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85131729966
    Appears in Collections:[Others] Periodical Articles

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