Proceedings of the Fourth Symposium on Information and Communication Technology
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Near infrared (NIR) is a portable, safe, affordable,non-invasive and negligibly intrusive functionaloptical imaging modality, which enables themeasurement of the metabolic changes associatedwith cognitive activity. In this paper, we presentthe experimental procedures and data analysis ofthe functional near infrared (fNIR) measurementsacquired from the forehead during cognitive tasks.The data is collected from subjects engaged in twostandardized tasks, namely, the targetcategorization' and the guilty knowledge test'(GKT). In the case of target categorization, theaim is to study the changes in the bloodoxygenation and volume level while theparticipants are experiencing decrements invigilance, increased lapses of attention, cognitiveslowing. We measured 25 minutes-long bloodoxygenation and volume level changes duringtarget responses in 11 participants performingTarget Categorization. Data analysis resultsrevealed that the level of oxygenation changes inmissed targets is higher than the level in capturedtargets. The blood oxygenation and volume levelchanges during deceptive and truthful responseswere measured in 16 participants performing theGKT and analyzed using statistical data analysis.The results of our data analysis showed that thelevel of oxygenation changes during lie' task ishigher than the level during truth' task.