Using fMRI to investigate the potential cause of inverse oxygenation reported in fNIRS studies of motor imagery

被引:22
作者
Abdalmalak, Androu [1 ,2 ]
Milej, Daniel [1 ,2 ]
Cohen, David J. [2 ]
Anazodo, Udunna [1 ,2 ]
Ssali, Tracy [1 ,2 ]
Diop, Mamadou [1 ,2 ]
Owen, Adrian M. [3 ]
St Lawrence, Keith [1 ,2 ]
机构
[1] Lawson Hlth Res Inst, Imaging Program, London, ON N6A 4V2, Canada
[2] Western Univ, Dept Med Biophys, London, ON N6A 5C1, Canada
[3] Western Univ, Brain & Mind Inst, London, ON N6A 5B7, Canada
基金
加拿大自然科学与工程研究理事会; 加拿大健康研究院;
关键词
Functional near-infrared spectroscopy; Motor imagery; Inverse oxygenation; Functional magnetic resonance imaging; Brain-Computer interface; NEAR-INFRARED SPECTROSCOPY; BRAIN ACTIVITY; COMMUNICATION; STIMULATION; SENSITIVITY; DISORDERS; SIGNALS; MOMENTS; DETECT; FLIGHT;
D O I
10.1016/j.neulet.2019.134607
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
Motor imagery (MI) is a commonly used cognitive task in brain-computer interface (BCI) applications because it produces reliable activity in motor-planning regions. However, a number of functional near-infrared spectroscopy (fNIRS) studies have reported the unexpected finding of inverse oxygenation: increased deoxyhemoglobin and decreased oxyhemoglobin during task periods. This finding questions the reliability of fNIRS for BCI applications given that MI activation should result in a focal increase in blood oxygenation. In an attempt to elucidate this phenomenon, fMRI and fNIRS data were acquired on 15 healthy participants performing a MI task. The fMRI data provided global coverage of brain activity, thus allowing visualization of all potential brain regions activated and deactivated during task periods. Indeed, fMRI results from seven subjects included activation in the primary motor cortex and/or the pre-supplementary motor area during the rest periods in addition to the expected activation in the supplementary motor and premotor areas. Of these seven subjects, two showed inverse oxygenation with fNIRS. The proximity of the regions showing inverse oxygenation to the motor planning regions suggests that inverse activation detected by fNIRS may likely be a consequence of partial volume errors due to the sensitivity of the optodes to both primary motor and motor planning regions.
引用
收藏
页数:6
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