def cleanOnsets(onsets):
    """
    Description:
        Label columns and remove first six junk rows
        (3 junk trials; 2 rows per trial).

    Parameters:
    ----------
    onsets: pandas object

    Return:
    ----------
    onsets: pandas object
    """
    # add column headers
    onsets.columns = ["TrialNum", "Condition", "TrialNum_perCondi",
                      "ImageID", "Trial_part", "onsetSec", "durationSec"]
    onsets.drop([0, 1, 2, 3, 4, 5], axis=0, inplace=True)
    return onsets