Abstract
The objective of this research was to evaluate the autonomic nervous function in photoplethysmography (PS) under emotional stimuli using a cellular phone. Twenty-four healthy subjects were examined. PS was measured under audio-visual stimuli in 3 sessions and sentence stimuli in 2 sessions on a cellular phone. A session consisted of three time repeats of a task for 40 seconds and recall for 180 seconds. Pulse waves from PS were analyzed to estimate the pulse wave amplitude to compare among sessions. The results showed that in the audio-visual stimuli, the pulse wave amplitudes of pleasant and unpleasant stimuli in task and recall were significantly lower than the values of the relax stimuli. The amplitudes of the relax and unpleasant stimuli in recall were significantly higher than the values in task. In the sentence stimuli, the pulse wave amplitudes of the pleasant sentence and unpleasant sentence stimuli in recall were significantly lower than the values in task. These events suggest that the autonomic nervous reaction under the emotional sentence stimuli using a cellular phone would be different from those under the audio-visual stimuli.
