The Influence of the Visible Light Condition of Target Samples and the Subject's Awareness of This Condition in Non-visual Color Recognition

The authors conducted a series of non-visual color recognition tests on a socalled psychic individual, using five different colored sponges ('red,' 'yellow,' 'green,' 'blue' and 'black) which were covered with boxes so as to black perception by directly touching the sponges. In every test, the subject was blindfolded with an eyemask, and hand sensation was used to identify colors. Two kinds of boxes were used. One was a transparent box which did not obstruct visible light to the target sample, and the other was a black-lined box which obstructed visible light to it. The subject was notified in advance of the kind of box used in the tests, but in half of the cases, the subject was intentionally given false information. Thus, four categorized tests by combining two kinds of boxes and two types of given information (right and false) were carried out and evaluated. The subject performed 200 trials in each test. Every recognition rate was significantly high, but at the same time, it was observed that the recognition rate of tests using a transparent box was higher than that of a black-lined box, and the recognition rate when the subject was notified of the use of the transparent box in advance was higher than that of the black-lined box. The authenticity of the information given to the subject did not actually influence the recognition rates.