Relation between asymmetry of prefrontal cortex activities and the autonomic nervous system during a mental arithmetic task: near infrared spectroscopy study

Neuroscience Letters
Masahiro TanidaKeiko Tagai

Abstract

The present study evaluated the relationship between asymmetry of the prefrontal cortex activity and the automatic nervous system (ANS) response during a mental arithmetic (MA) task. Employing near infrared spectroscopy, we compared cerebral blood oxygenation changes in the right and left prefrontal cortices during a mental arithmetic task with HR changes. During the MA task, eight subjects (high-HR group) showed large HR increases (14.2 +/- 3.0) while eight subjects (low-HR group) showed small HR increases (3.6 +/- 2.8) (P < 0.00001). In both the high-HR and low-HR groups, near infrared spectroscopy (NIRS) demonstrated increases of oxyhemoglobin and total hemoglobin (=oxyhemoglobin + deoxyhemoglobin) associated with decreases of deoxyhemoglobin in the bilateral prefrontal cortices during MA task. In the high-HR group, the laterality ratio scores, i.e., [(R - L)/(R + L) of oxyhemoglobin and total hemoglobin], showed positive values (0.17 +/- 0.11 and 0.17 +/- 0.17, respectively), while in the low-HR group, the laterality ratio scores showed negative values (-0.28 +/- 0.21 and -0.35 +/- 0.24, respectively). In addition, there were significant positive correlations between HR changes and the laterality ratio scores of oxyhemoglob...Continue Reading

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