Abstract
In this study, multichannel near-infrared spectroscopy (NIRS) was used to measure the difference between cerebral hemoglobin concentration during a complete-letter recognition task and that during an incomplete-letter recognition task. In the incomplete-letter recognition task, 90% of the black pixels in the letter images were erased randomly. 13 subjects participated in the experiment. The results demonstrated that the relative oxygenated hemoglobin concentration (oxyHb) during the incomplete-letter recognition task was higher than that during the complete-letter recognition task. Furthermore, the oxy-Hb difference between the two sections in the bilateral frontal areas was more significant than that in the occipital areas, indicating that the frontal cortex plays a more important role in recognizing incomplete objects than the visual cortex.
