Evoked-cerebral blood oxygenation changes in false-negative activations in BOLD contrast functional MRI of patients with brain tumors. - Norio Fujiwara; Kaoru Sakatani; Yoichi Katayama; Yoshihiro Murata; Tetsuya Hoshino; Chikashi Fukaya; Takamitsu Yamamoto (NeuroImage, 2004)