| A new visually evoked cerebral blood flow response analysis using a low-frequency estimation. | |
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MedLine Citation:
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PMID: 20133037 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Transcranial Doppler (TCD) has been widely used to monitor cerebral blood flow velocity (BFV) during the performance of cognitive tasks compared with repose periods. Although one of its main advantages is its high temporal resolution, only some of the previous functional TCD studies have focused on the analysis of the temporal evolution of the BFV signal and none of them has performed a spectral analysis of the signal. In this study, maximum BFV data in both posterior cerebral arteries was monitored during a visual perception task (10 cycles of alternating darkness and illumination) for 23 subjects. A peak was located in the low-frequency band of the spectrum of the maximum BFV of each subject both during visual stimulation and repose periods. The frequency of this peak was in the range between 0.037 and 0.098Hz, depending on the subject, the vessel and the experimental condition. The component of the signal at this frequency, which is associated with the slow variations caused by the visual stimuli, was estimated. That way, the variations in BFV caused by the experimental stimuli were isolated from the variations caused by other factors. This low-frequency estimation signal was used to obtain parameters about the temporal evolution and the magnitude variations of the BFV in a reliable way, thus, characterizing the neurovascular coupling of the participants. |
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Authors:
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Beatriz Rey; Valery Naranjo; Vera Parkhutik; Jos? Tembl; Mariano Alca?iz |
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Publication Detail:
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Type: Journal Article Date: 2010-02-04 |
Journal Detail:
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Title: Ultrasound in medicine & biology Volume: 36 ISSN: 1879-291X ISO Abbreviation: Ultrasound Med Biol Publication Date: 2010 Mar |
Date Detail:
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Created Date: 2010-02-22 Completed Date: 2010-05-26 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0410553 Medline TA: Ultrasound Med Biol Country: England |
Other Details:
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Languages: eng Pagination: 383-91 Citation Subset: IM |
Copyright Information:
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Copyright 2010 World Federation for Ultrasound in Medicine & Biology. Published by Elsevier Inc. All rights reserved. |
Affiliation:
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Instituto en Bioingenier?a y Tecnolog?a Orientada al Ser Humano, Universidad Polit?cnica de Valencia, Valencia, Spain. brey@labhuman.i3bh.es |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Aged Blood Flow Velocity Cerebrovascular Circulation / physiology* Darkness Female Humans Light Male Middle Aged Photic Stimulation* Young Adult |
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