This function epochs data based on a single event message (i.e., without explicit limits).
epoch_only_start_msg(eyeris, start, hz, verbose)
A list containing epoch results
An object of class eyeris
derived from load_asc()
A dataframe containing the start timestamps
Sampling rate in Hz
A flag to indicate whether to print detailed logging messages
This function is called by the internal epoch_only_start_msg()
function.