TY - GEN
T1 - Functional brain monitoring via NIR based optical spectroscopy
AU - Izzetoglu, K.
AU - Yurtsever, G.
AU - Bozkurt, A.
AU - Bunce, S.
N1 - Publisher Copyright:
© 2003 IEEE.
PY - 2003
Y1 - 2003
N2 - Cognitive activity is associated with changes in optical properties of the brain tissue. Near infrared (NIR) based optical measurements during brain activation can assess the hemodynamic changes, namely blood oxygenation and blood volume. Furthermore, near infrared spectroscopy (NIRS) has recently attracted much interest, since the technology allows the design of portable, safe, affordable, non-invasive and negligibly intrusive monitoring systems. In this paper, we present experimental procedures and results of the functional near infrared (fNIR) measurements acquired from the forehead during cognitive tasks. The data is collected from subjects engaged in two standardized attention and working memory tasks, respectively, the 'target categorization' and the 'n-back memory' tests. In the case of target categorization, the aim is to study changes in blood oxygenation and volume level while participants are experiencing decrements in vigilance, increased lapses of attention and cognitive slowing. Data analysis results revealed that the level of oxygenation changes in missed targets is higher than the level in captured targets. The blood oxygenation and volume level changes during consistently varying "loads" on working memory were measured in participants performing the n-back test. The results show that the level of oxygenation rises with the increase of working memory load.
AB - Cognitive activity is associated with changes in optical properties of the brain tissue. Near infrared (NIR) based optical measurements during brain activation can assess the hemodynamic changes, namely blood oxygenation and blood volume. Furthermore, near infrared spectroscopy (NIRS) has recently attracted much interest, since the technology allows the design of portable, safe, affordable, non-invasive and negligibly intrusive monitoring systems. In this paper, we present experimental procedures and results of the functional near infrared (fNIR) measurements acquired from the forehead during cognitive tasks. The data is collected from subjects engaged in two standardized attention and working memory tasks, respectively, the 'target categorization' and the 'n-back memory' tests. In the case of target categorization, the aim is to study changes in blood oxygenation and volume level while participants are experiencing decrements in vigilance, increased lapses of attention and cognitive slowing. Data analysis results revealed that the level of oxygenation changes in missed targets is higher than the level in captured targets. The blood oxygenation and volume level changes during consistently varying "loads" on working memory were measured in participants performing the n-back test. The results show that the level of oxygenation rises with the increase of working memory load.
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U2 - 10.1109/NEBC.2003.1216132
DO - 10.1109/NEBC.2003.1216132
M3 - Conference contribution
AN - SCOPUS:3042523693
T3 - Proceedings of the IEEE Annual Northeast Bioengineering Conference, NEBEC
SP - 335
EP - 336
BT - Proceedings of the IEEE 29th Annual Northeast Bioengineering Conference
A2 - Reisman, Stanley
A2 - Foulds, Richard
A2 - Mantilla, Bruno
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 29th IEEE Annual Northeast Bioengineering Conference, NEBC 2003
Y2 - 22 March 2003 through 23 March 2003
ER -