@inproceedings{CTT100586709,
  author = {Yasunori Kotani and Yumiko Kuramoto and Tsukamoto Testuji and Tatsuya Yoshihiro and Yoshimi Ohgami and Yusuke Inoue and Yasutsugu Aihara},
  title = {The effect of task difficulty on the stimulus-preceding negativity (SPN): fMRI and ERP studies},
  booktitle = {Psychophysiology},
  year = 2008,
}