Abstract. Many psychology researches are performed through “psychology subject pools” which give participants considerable flexibility when they participate. This “participant degree-of-freedom” has led to concern that the characteristics of pool may change with time, most engaged students signing up at start semester and least leaving it all end. In this paper, we an exploratory analysis look ...

In the Funding section, the grant number from the funder National Basic Research Program of China is listed incorrectly. The correct grant number is: 2014CB954004. The publisher apologizes for the error. 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 ...