Non-visual Color Recognition Experiment without the Subject Being Given Test Result Feedback

The authors have been demonstrating the existence of non-visual color recognition. In this non-visual recognition experiment, the male subject was only informed that the target samples were colored cards and not actually shown them. He identified colors by using hand sensation. In order to avoid a learning-effect, the subject was not informed of test results each time. Under this condition, two tests were carried out. One was color identification among five colors ('red,' 'yellow,' 'green,' 'blue' and 'purple') by using 121 colored cards. Each of them differed in brightness values, saturation chromas and hues. The other was identification among four colors ('red,' 'yellow,' 'green,' 'blue' and 'purple') by using 113 different colored cards. These tests produced significant results to suggest that non-visual color recognition was possible without the subject judging from test result feedback.