Akiko Callan

Main Lab Location:
CiNet (Main bldg.)
Specific Research Topic:
Auditory neuroscience
Mailing Address:
1-4 Yamadaoka, Suita City Osaka, 565-0871

My research focuses on how auditory information is processed in the human brain. The ability for humans to identify and localize sounds in real-world environments is of considerable ecological significance.

Specifically, my research uses brain-imaging techniques, such as fMRI, to investigate auditory processing using complex realistic stimuli. One area of focus is sound source localization. In humans, sound sources are localized by stimulus-induced time, level, and spectral differences between left and right ears. In our daily lives, we are exposed to very complex sounds that include multiple sources and room reverberation. In order to understand neural processing of ecologically valid sounds, I run neuroimaging experiments with complex auditory stimuli that include not only interaural time and level differences but also interaural spectral differences and room reverberation.

This research will provide a better understanding of the neural processes underlying auditory perception that has implications for the development of new technology and treatment of individuals with hearing impairment.

Selected Publications:

Callan, A., Callan, D. and Ando, H. (2016). The importance of spatiotemporal information in biological motion perception: White noise presented with a step-like motion activates the biological motion area.
Journal of Cognitive Neuroscience 29, 277-285.

Callan, A., Callan, D., and Ando, H. (2015). An fMRI study of the ventriloquism effect. Cerebral Cortex 25, 4248-4258.

Callan, A., Callan, D., Ando, H. (2013). Neural correlates of sound externalization. NeuroImage 66, 22-27.

Callan, A., Osu, R., Yamagishi, Y, Callan, D., Inoue N. (2009). Neural correlates of resolving uncertainty in driver’s decision making. Human Brain Mapping 30 (9), 2804-2812.

Callan, A., Callan, D., Masaki, S. (2005). When meaningless symbols become letters: Neural activity change in learning new phonograms. NeuroImage 28, 553-562.