Supporting materials for the GX Dataset. The GX Dataset is a dataset of combined tES, EEG, physiological, and behavioral signals from human subjects. Publication Dataset of Concurrent EEG, ECG, and Behavior with Multiple Doses of transcranial Electrical Stimulation Descriptions A dataset combining high-density electroencephalography (EEG) with physiological and continuous behavioral metrics during transcranial electrical stimulation (tES). Data includes within subject application of nine High-Definition tES (HD-tES) types targeted three brain regions (frontal, motor, parietal) with three waveforms (DC, 5Hz, 30Hz), with more than 783 total stimulation trials over 62 sessions with EEG, physiological (ECG, EOG), and continuous behavioral vigilance/alertness metrics. Acknowledgments Portions of this study were funded by X (formerly Google X), the Moonshot Factory. The funding source had no influence on study conduction or result evaluation. MB is further supported by grants from the National Institutes of Health: R01NS101362, R01NS095123, R01NS112996, R01MH111896, R01MH109289, and (to NG) NIH-G-RISE T32GM136499. Extras For downsampled data please see: Experiment 1 : https://doi.org/10.5281/zenodo.3840615 Experiment 2 : https://doi.org/10.5281/zenodo.3840617 Data License Creative Common 4.0 with attribution (CC BY 4.0)