The repository contains: 1. MATLAB code used to: (A) construct frequency-specific spatiotemporal filters that isolate steady-state evoked potentials (SSEPs) from endogenous brain activity; (B) estimate statistical reliability of SSEP responses by constructing frequency-specific spatiotemporal filters using trials, on which neither flicker frequency nor its harmonics were present. The code is an extension of previously published method called Rhythmic Entrainment Source Separation (RESS; Cohen and Gulbinaite, 2017 [PMID: 27916666][1]). 2. Sample dataset, which was pre-processed as described in https://www.biorxiv.org/content/10.1101/518779v1. Dataset is in EEGLAB format (https://sccn.ucsd.edu/eeglab/index.php). Epochs: -1 to 9 sec, where 0 us the cue onset. Trial markers are organized as follows (cue location / LED state / cue validity): - Attend Left/ Flicker/ Valid - 193 - Attend Left/ Flicker/ Invalid - 194 - Attend Left/ Static/ Valid - 195 - Attend Left/ Static/ Invalid - 196 - Attend Right/ Flicker/ Valid - 197 - Attend Right/ Flicker/ Invalid - 198 - Attend Right/ Static/ Valid - 199 - Attend Right/ Static/ Invalid - 200 [1]: https://www.sciencedirect.com/science/article/pii/S105381191630653X?via=ihub