Chen, Yi-Chuan
Huang, Pi-Chun
Woods, Andy
Spence, Charles
Article History
Received: 17 December 2015
Accepted: 4 May 2016
First Online: 27 May 2016
Competing interests
: A.W. is the founder of Xperiment. He helped set up the on-line experiment but was not involved in data analysis. Xperiment provided no financial support for the current study.