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. 2014 Nov 10;9(11):e111157. doi: 10.1371/journal.pone.0111157

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© 2014 Yeom et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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(a) The classical row-column (RC) paradigm, (b) The proposed random set presentation (RASP) paradigm, (c) RASP paradigm with flashing self-face in one row of the virtual matrix, (d) RASP paradigm with flashing non-self-face in one column of the virtual matrix. Both RASP and RASP-F stimuli were shown semi-transparently to the participants such that the characters were still visible. However, this is not shown here for illustration purposes.