Relative Timing of Brain Activations Revealed by Ultra-Fast MR Inverse Imaging (InI)

Fa-Hsuan Lin¹, Thomas Witzel¹, Tommi Raij, Jyrki Ahveninen, John Bellveau

We use the ultra fast MR inverse imaging (InI) to interrogate the feasibility to detect hemodynamic timing difference across the brain areas using a two-choice reaction time task. We hypothesize that the vascular response variability can be reduced in the group-level analysis such that neuronally related timing information can become distinct. The MRI and behavior results supported this hypothesize by showing statistically significant timing first at visual and then at motor cortices in our group data (N=23).