Functional magnetic resonance imaging (fMRI) is an indirect measure of brain activity, i.e. it is a convolution of the latent (unmeasured) neural signal and the hemodynamic response function (HRF). As such, the HRF has been shown to vary across brain regions and individuals. The shape of the HRF is controlled by both neural and non-neural factors. The shape of the HRF can be characterized by three parameters (response height, time-to-peak and full-width at half-max). The data presented here provides the three HRF parameters at every voxel, obtained from U.S. Army soldiers (N=87) diagnosed with posttraumatic stress disorder (PTSD), with comorbid PTSD and mild-traumatic brain injury (mTBI), and matched healthy combat controls. Findings from this data and further interpretations are available in our recent research study (Rangaprakash et al., 2017) . This data is a valuable asset in studying the impact of HRF variability on fMRI data analysis, specifically resting state functional connectivity.
Rangaprakash, D., Dretsch, M. N., Yan, W., Katz, J. S., Denney, T. S., & Deshpande, G. (2017). Hemodynamic response function parameters obtained from resting-state functional MRI data in soldiers with trauma. Data in Brief, 14, 558–562. https://doi.org/10.1016/j.dib.2017.07.072