Prefrontal Cerebral Oxygenated Hemoglobin Concentration during the Category Fluency and Finger-Tapping Tasks in Adults with and without Mild Cognitive Impairment: A Near-Infrared Spectroscopy Study.

In the category fluency task on the first trial, the oxyhemoglobin signals in all three groups showed an increasing trend at the beginning of the task, and then the signal was maintained or decreased toward the end of the task on the second trial.

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In the dual task, the oxyhemoglobin signals in young controls showed a decreasing trend after the start of the task, followed by a slight increase in the first trial; whereas in the second trial, the signals substantially increased at the beginning of the second trial and slightly decreased after the start of the task, followed by a slight increase.

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In the finger-tapping task, the oxyhemoglobin signals in young controls showed a trend toward a decrease in both the first and second trials, while it was maintained or increased in the elderly participants with and without MCI.

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