Examination of the individual differences under the same image viewing environment by using NIRS

The individual differences in cerebral blood flow have been existing, so it is difficult to compare the data of cerebral blood flow for different people, and it is not known what kind of environmental influences such as time, temperature, sound etc. will have. Also, if an individual conducts an experiment more than once, it is not known whether the obtained data has reproducibility. In this experiment, in order to study the diversity of measurement data among individuals at same image viewing environment, two subjects simultaneously observe 30 images and consider whether the difference of subjects will affect the measurement cerebral blood flow. Also, in order to consider whether the experiment data of the same subject is reproducible or not, consider twice 30 images and examine whether it influences measurement of cerebral blood flow rate.