We have examined how influence in brain action to thinking and understanding by seeing hardcopy and softcopy with use of IQ test method. In general, the sense of fatigue in softcopy working may be deeper than in hardcopy working. The hardcopy working in paper and oral answer methods indicates higher IQ than that of softcopy. It can be clarified by using IQ test problems that the difference to human interaction between hardcopy and softcopy as information carrier perception and thinking exists generally.
Hirotaka Watanabe, Makoto Omodani, Yasusuke Takahashi, "Softcopy and Hardcopy as an Information Carrier: Whether or Not Existing a Difference in Interaction with Human Brain" in Proc. IS&T Int'l Conf. on Digital Printing Technologies (NIP15), 1999, pp 390 - 393, https://doi.org/10.2352/ISSN.2169-4451.1999.15.1.art00005_2