Discrimination of playing cards by EEGs during recognizing and recalling

Playing cards estimation magic without a trick

Abstract

The authors measured electroencephalograms (EEGs) from subjects on recognizing and on recalling 13types of playing card images (from Ace to King) presented on a CRT. Each presented image card is the club. The canonical discriminant analysis was applied to these single trial EEGs. Four channels of EEGs at the right frontal and temporal were used in the discrimination. They were Fp2, F4, C4 and F8 according to the international 10-20 system. Sampling data were taken from 400ms to 900ms at 25ms intervals from each single trial EEG. The number of variates is twenty one by four channels ; so the data are eighty four dimensional vectors. The number of external criteria is thirteen, from Ace to King, and a number of explanation variates is thus eighty four. Results of the canonical discriminant analysis by use of so called jack knife method were more than 90% for nine subjects. We could perform a playing cards estimation magic without a trick.