ERPLAB is an open-source MATLAB toolbox for processing and analyzing event-related potential (ERP) data. It is closely integrated with EEGLAB, a popular open-source EEG toolbox, and provides additional tools for filtering, artifact detection, re-referencing, and event code processing. ERPLAB offers robust functions for averaging ERPs, creating difference waves, and plotting ERP waveforms and scalp maps. It also allows users to quantify amplitudes and latencies of ERP components. ERPLAB is accessible via a graphical user interface (GUI) or MATLAB scripts, making it user-friendly for both novice and experienced researchers. The toolbox includes extensive documentation, including a user's guide, tutorial, scripting guide, and video demonstrations. ERPLAB is compatible with major EEG file formats and runs on all major operating systems. It provides a convenient workflow, fast learning curve, and flexible processing capabilities. ERPLAB's design emphasizes ease of use and powerful functionality, making it suitable for both simple and complex ERP experiments. The toolbox includes features for artifact detection, rejection, and correction, as well as tools for re-referencing and channel operations. ERPLAB also supports statistical analyses, including permutation-based methods and the jackknife approach. ERPLAB's documentation and support are available online, and users can seek assistance via email. Overall, ERPLAB is a versatile and powerful tool for ERP research, offering a balance of ease of use and advanced functionality.ERPLAB is an open-source MATLAB toolbox for processing and analyzing event-related potential (ERP) data. It is closely integrated with EEGLAB, a popular open-source EEG toolbox, and provides additional tools for filtering, artifact detection, re-referencing, and event code processing. ERPLAB offers robust functions for averaging ERPs, creating difference waves, and plotting ERP waveforms and scalp maps. It also allows users to quantify amplitudes and latencies of ERP components. ERPLAB is accessible via a graphical user interface (GUI) or MATLAB scripts, making it user-friendly for both novice and experienced researchers. The toolbox includes extensive documentation, including a user's guide, tutorial, scripting guide, and video demonstrations. ERPLAB is compatible with major EEG file formats and runs on all major operating systems. It provides a convenient workflow, fast learning curve, and flexible processing capabilities. ERPLAB's design emphasizes ease of use and powerful functionality, making it suitable for both simple and complex ERP experiments. The toolbox includes features for artifact detection, rejection, and correction, as well as tools for re-referencing and channel operations. ERPLAB also supports statistical analyses, including permutation-based methods and the jackknife approach. ERPLAB's documentation and support are available online, and users can seek assistance via email. Overall, ERPLAB is a versatile and powerful tool for ERP research, offering a balance of ease of use and advanced functionality.