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5 March 2014 Studying hemispheric lateralization during a Stroop task by near-infrared spectroscopy
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We measured hemodynamic activity of the prefrontal cortex (PFC) during a Chinese color-word matching Stroop task using a homemade continuous-wave NIRS system. Two probes were placed separately over the left and the right PFC. Wavelet transform coherence (WTC) analysis was employed to calculate coherences between all channels of the same probe pairwise to obtain the intrahemispheric functional connectivity for each side of the PFC. The intrahemispheric functional connectivities in both sides of PFC were stronger during the incongruent task compared to that of the neutral task, but only the left intrahemispheric functional connectivity showed a significant Stroop effect. In addition to the Stroop effect, for the incongruent or the neutral task, there was also a leftward lateralization. The results indicate that, compared with traditional activation, NIRS-based connectivity is more sensitive for identifying hemispheric lateralization.
© (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Lei Zhang, Jinyan Sun, Bailei Sun, Qingming Luo, and Hui Gong "Studying hemispheric lateralization during a Stroop task by near-infrared spectroscopy", Proc. SPIE 8928, Optical Techniques in Neurosurgery, Neurophotonics, and Optogenetics, 892814 (5 March 2014);

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