Learning-induced neural plasticity associated with improved identification performance after training of a difficult second-language phonetic contrast. - Daniel E. Callan; Keiichi Tajima; Akiko M. Callan; Rieko Kubo; Shinobu Masaki; Reiko Akahane-Yamada (NeuroImage, 2003)

Phonetic perceptual identification by native- and second-language speakers differentially activates brain regions involved with acoustic phonetic processing and those involved with articulatory-auditory/orosensory internal models. - Daniel E. Callan; Jeffery A. Jones; Akiko M. Callan; Reiko Akahane-Yamada (NeuroImage, 2004)

When meaningless symbols become letters: Neural activity change in learning new phonograms. - Akiko M. Callan; Daniel E. Callan; Shinobu Masaki (NeuroImage, 2005)

Song and speech: Brain regions involved with perception and covert production. - Daniel E. Callan; Vassiliy Tsytsarev; Takashi Hanakawa; Akiko M. Callan; Maya Katsuhara; Hidenao Fukuyama; Robert Turner (NeuroImage, 2006)