Dynamics of lactate concentration and blood oxygen level-dependent effect in the human visual cortex during repeated identical stimuli

2007 ◽  
Author(s):  
Silvia Mangia ◽  
Ivan Tká?? ◽  
Nikos K. Logothetis ◽  
Rolf Gruetter ◽  
Pierre-Francois Van de Moortele ◽  
...  
Keyword(s):  
Visual Cortex ◽  
Lactate Concentration ◽  
Blood Oxygen Level Dependent ◽  
Blood Oxygen ◽  
Oxygen Level ◽  
Blood Oxygen Level ◽  
Dependent Effect ◽  
Human Visual Cortex

Retinotopic variations of the negative blood-oxygen-level dependent hemodynamic response function in human primary visual cortex

2021 ◽  
Vol 125 (4) ◽  
pp. 1045-1057 ◽  
Author(s):  
Natasha de la Rosa ◽  
David Ress ◽  
Amanda J. Taylor ◽  
Jung Hwan Kim
Keyword(s):  
Visual Cortex ◽  
Response Function ◽  
Complex Dynamics ◽  
Hemodynamic Response ◽  
Blood Oxygen Level Dependent ◽  
Blood Oxygen ◽  
Oxygen Level ◽  
Hemodynamic Response Function ◽  
Blood Oxygen Level ◽  
Early Visual Cortex

We investigate dynamics of the negative hemodynamic response function (nHRF), the negative blood-oxygen-level-dependent (BOLD) response (NBR) evoked by a brief stimulus, in human early visual cortex. Here, we show that the nHRFs are not inverted versions of the corresponding pHRFs. The nHRF has complex dynamics that varied significantly with eccentricity. The results also show shift-invariant temporal linearity does not hold for the NBR.

scholarly journals Study of the FMRI blood oxygen level dependent effect by near-infrared spectroscopy

2003 ◽  
Author(s):  
Vladislav Toronov ◽  
Andrew Webb ◽  
Scott Walker ◽  
Rajarsi Gupta ◽  
Jee H. Choi ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Near Infrared Spectroscopy ◽  
Near Infrared ◽  
Blood Oxygen Level Dependent ◽  
Blood Oxygen ◽  
Oxygen Level ◽  
Blood Oxygen Level ◽  
Dependent Effect

scholarly journals Covert neurofeedback without awareness shapes cortical network spontaneous connectivity

2016 ◽  
Vol 113 (17) ◽  
pp. E2413-E2420 ◽  
Author(s):  
Michal Ramot ◽  
Shany Grossman ◽  
Doron Friedman ◽  
Rafael Malach
Keyword(s):  
Visual Cortex ◽  
Functional Connectivity ◽  
Functional Mri ◽  
Blood Oxygen Level Dependent ◽  
Blood Oxygen ◽  
Oxygen Level ◽  
Neurofeedback Training ◽  
Learning Situation ◽  
Blood Oxygen Level ◽  
Training Effects

Recent advances in blood oxygen level-dependent–functional MRI (BOLD-fMRI)-based neurofeedback reveal that participants can modulate neuronal properties. However, it is unknown whether such training effects can be introduced in the absence of participants' awareness that they are being trained. Here, we show unconscious neurofeedback training, which consequently produced changes in functional connectivity, introduced in participants who received positive and negative rewards that were covertly coupled to activity in two category-selective visual cortex regions. The results indicate that brain networks can be modified even in the complete absence of intention and awareness of the learning situation, raising intriguing possibilities for clinical interventions.

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