1 Section of Behavioral Sciences, Graduate School of Integrated Arts and Sciences, Hiroshima University, Higashi, Hiroshima, 739-8521, Japan.
2 Department of Integrative Biology and the Helen Wills Neuroscience Institute, University of California at Berkeley, Berkeley, CA, 94720-3140, USA.
3 Department of Agrobiological Science, Faculty of Agriculture, Ehime University, Matsuyama, 790-8566, Japan.
4 Department of Psychology and the Helen Wills Neuroscience Institute, University of California at Berkeley, Berkeley, CA, 94720-3140, USA.
5 Section of Behavioral Sciences, Graduate School of Integrated Arts and Sciences, Hiroshima University, Higashi, Hiroshima, 739-8521, Japan. ukena@hiroshima-u.ac.jp.
6 Department of Psychology and the Helen Wills Neuroscience Institute, University of California at Berkeley, Berkeley, CA, 94720-3140, USA. ukena@hiroshima-u.ac.jp.