The investigators propose to employ advanced multi-channel near non-invasive near infrared spectroscopy (NIRS) system married with entirely non-invasive continuous arterial blood pressure (niABP) monitor to create a new wearable and portable imaging system that derives CA maps of the entire brain with high sampling rates at each point. The objectives of this project are as follows: 1. To perform in vivo testing and optimization of the device using a block-trial design to evaluate the CA mapping system's performance during various perturbations. 2. To explore the impact of aging and sex on regional disparities in CA in a healthy volunteer population using static recording along with perturbation testing.