Abstract #4648

Infrequent auditory stimuli elicit BOLD signals of shorter duration

Jo-Fu Lotus Lin¹, Yi-Ting Lin¹, Juan Silva-Pereyra², and Fa-Hsuan Lin^1,3

¹Institute of Biomedical Engineering, National Taiwan University, Taipei, Taiwan, ²Facultad de Estudios Superiores Iztacala (FES-I), Universidad Nacional Autónoma de México, Mexico City, Mexico, ³Department of Neuroscience and Biomedical Engineering, Aalto University, Espoo, Finland

To characterize the hemodynamic responses of mismatch negativity, we measured BOLD signals elicited by frequent and infrequent sequences of sounds using fast fMRI acquisitions with 0.1 s precision. The average temporal width of the hemodynamic responses was 4.2 s in the superior temporal areas. The width of hemodynamic responses was significantly wider in the standard (4.9 s +/- 1.1 s) than the deviant trials (3.6 s +/- 1.7 s).

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