An EEGLAB/ERPLAB extension that extracts the mean amplitude surrounding the peak latency for each channel in the interval period specified. Effectively this can be considered as moving the window period to center around the peak amplitude.
To use these functions, click the "Clone or download" button on the right and then select "Download ZIP". Once the file has downloaded, unzip the package and then copy the erppeakintervalX.X file into the EEGLAB plugins folder.