Investigation of verbal and visual working memory by multi-channel time-resolved functional near-infrared spectroscopy

D. Contini; M. Caffini; R. Re; L. Zucchelli; L. Spinelli; S. Basso Moro; S. Bisconti; M. Ferrari; V. Quaresima; S. Cutini; A. Torricelli

doi:10.1117/12.2003777

25 March 2013 Investigation of verbal and visual working memory by multi-channel time-resolved functional near-infrared spectroscopy

D. Contini, M. Caffini, R. Re, L. Zucchelli, L. Spinelli, S. Basso Moro, S. Bisconti, M. Ferrari, V. Quaresima, S. Cutini, A. Torricelli

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Proceedings Volume 8578, Optical Tomography and Spectroscopy of Tissue X; 85782Z (2013) https://doi.org/10.1117/12.2003777
Event: SPIE BiOS, 2013, San Francisco, California, United States

Abstract

Working memory (WM) is fundamental for a number of cognitive processes, such as comprehension, reasoning and learning. WM allows the short-term maintenance and manipulation of the information selected by attentional processes. The goal of this study was to examine by time-resolved fNIRS neural correlates of the verbal and visual WM during forward and backward digit span (DF and DB, respectively) tasks, and symbol span (SS) task. A neural dissociation was hypothesised between the maintenance and manipulation processes. In particular, a dorsolateral/ventrolateral prefrontal cortex (DLPFC/VLPFC) recruitment was expected during the DB task, whilst a lateralised involvement of Brodmann Area (BA) 10 was expected during the execution of the DF task. Thirteen subjects were monitored by a multi-channel, dual-wavelength (690 and 829 nm) time-resolved fNIRS system during 3 minutes long DF and DB tasks and 4 minutes long SS task. The participants’ mean memory span was calculated for each task: DF: 6.46±1.05 digits; DB: 5.62±1.26 digits; SS: 4.69±1.32 symbols. No correlation was found between the span level and the heart rate data (measured by pulse oximeter). As expected, DB elicited a broad activated area, in the bilateral VLPFC and the right DLPFC, whereas a more localised activation was observed over the right hemisphere during either DF (BA 10) or SS (BA 10 and 44). The robust involvement of the DLPFC during DB, compared to DF, is compatible with previous findings and with the key role of the central executive subserving in manipulating processes.

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D. Contini, M. Caffini, R. Re, L. Zucchelli, L. Spinelli, S. Basso Moro, S. Bisconti, M. Ferrari, V. Quaresima, S. Cutini, and A. Torricelli "Investigation of verbal and visual working memory by multi-channel time-resolved functional near-infrared spectroscopy", Proc. SPIE 8578, Optical Tomography and Spectroscopy of Tissue X, 85782Z (25 March 2013); https://doi.org/10.1117/12.2003777

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KEYWORDS

Visualization

Heart

Information operations

Near infrared spectroscopy

Prefrontal cortex

Hemodynamics

Lithium

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