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23 February 2009 Investigation of the prefrontal cortex in response to duration-variable anagram tasks using functional near infrared spectroscopy
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Abstract
The Prefrontal Cortex (PFC) in response to anagram tasks was investigated using multi-channel, functional Near Infrared Spectroscopy (fNIRS). The study focused on the variability of PFC response with variable anagram durations (executing time). The duration of the anagram ranged from a few seconds to over one minute. The topographic image of PFC showed high lateral consistency across different anagram durations and did not show remarkable discrimination between two difficulty levels: 4-letter and 6-letter anagrams. The superposition principle of a linear system model was employed to investigate the possible non-linearity between three discrete duration subgroups (D1 = 2 ± 0.33, D2 = 4 ± 0.67, and D3 = 8 ± 1.00 sec) and their resultant fNIR readings. Such analysis showed clearly a nonlinear behavior in fNIRS signals within the duration range of less than 4 sec, agreeing with the previous studies on cognitive response measured with functional Magnetic Resonant Imaging (fMRI). To our knowledge, this is the first report on the nonlinearity of cognitive response using fNIRS.
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Fenghua Tian, Britton Chance, and Hanli Liu "Investigation of the prefrontal cortex in response to duration-variable anagram tasks using functional near infrared spectroscopy", Proc. SPIE 7161, Photonic Therapeutics and Diagnostics V, 71613J (23 February 2009); https://doi.org/10.1117/12.809591
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