Measurement of temporal frequency characteristics of VEP using pseudorandom binary sequence and their correlation with cerebral blood flow in human visual cortex

2002 ◽  
Author(s):  
K. Momose ◽  
Y. Kimura ◽  
M. Kiyosawa ◽  
M. Senda ◽  
K. Komiya
Keyword(s):  
Blood Flow ◽  
Cerebral Blood Flow ◽  
Visual Cortex ◽  
Temporal Frequency ◽  
Binary Sequence ◽  
Frequency Characteristics ◽  
Pseudorandom Binary Sequence ◽  
Human Visual Cortex ◽  
Temporal Frequency Characteristics

scholarly journals Dynamics of the cerebral blood flow response to brief neural activity in human visual cortex

2019 ◽  
Vol 40 (9) ◽  
pp. 1823-1837 ◽  
Author(s):  
Jung Hwan Kim ◽  
Amanda J Taylor ◽  
Danny JJ Wang ◽  
Xiaowei Zou ◽  
David Ress
Keyword(s):  
Blood Flow ◽  
Cerebral Blood Flow ◽  
Visual Cortex ◽  
Temporal Dynamics ◽  
Oxygen Metabolism ◽  
Late Time ◽  
Neural Activation ◽  
Hemodynamic Response Function ◽  
Time Dynamics ◽  
Human Visual Cortex

The blood oxygen-level dependent (BOLD) functional magnetic resonance imaging (fMRI) signal depends on an interplay of cerebral blood flow (CBF), oxygen metabolism, and cerebral blood volume. Despite wide usage of BOLD fMRI, it is not clear how these physiological components create the BOLD signal. Here, baseline CBF and its dynamics evoked by a brief stimulus (2 s) in human visual cortex were measured at 3T. We found a stereotypical CBF response: immediate increase, rising to a peak a few second after the stimulus, followed by a significant undershoot. The BOLD hemodynamic response function (HRF) was also measured in the same session. Strong correlations between HRF and CBF peak responses indicate that the flow responses evoked by neural activation in nearby gray matter drive the early HRF. Remarkably, peak CBF and HRF were also strongly modulated by baseline perfusion. The CBF undershoot was reliable and significantly correlated with the HRF undershoot. However, late-time dynamics of the HRF and CBF suggest that oxygen metabolism can also contribute to the HRF undershoot. Combined measurement of the CBF and HRF for brief neural activation is a useful tool to understand the temporal dynamics of neurovascular and neurometabolic coupling.

scholarly journals Coupling of cerebral blood flow and oxygen metabolism is conserved for chromatic and luminance stimuli in human visual cortex

NeuroImage ◽  
2013 ◽  
Vol 68 ◽  
pp. 221-228 ◽  
Author(s):  
Oleg Leontiev ◽  
Giedrius T. Buracas ◽  
Christine Liang ◽  
Beau M. Ances ◽  
Joanna E. Perthen ◽  
...  
Keyword(s):  
Blood Flow ◽  
Cerebral Blood Flow ◽  
Visual Cortex ◽  
Oxygen Metabolism ◽  
Human Visual Cortex

PRBS-determined temporal frequency characteristics of VEP in glaucoma

2004 ◽  
Vol 108 (1) ◽  
pp. 41-46 ◽  
Author(s):  
Keiko Momose ◽  
Motohiro Kiyosawa ◽  
Nobuyuki Nemoto ◽  
Hiroshi Mori ◽  
Manabu Mochizuki ◽  
...  
Keyword(s):  
Temporal Frequency ◽  
Frequency Characteristics ◽  
Temporal Frequency Characteristics
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