def find_blocks(vid, mri_start):
    """
    Takes the start time and a vid tuple list to find the relative
    block numbers, their start times, and their type (string).
    """
    blocks = []
    onsets = []
    for v in vid:

        # we will use this to search through the response files
        block_number = v[1]

        # this is maybe useless (e.g., 'vid_4')
        block_name = v[3]

        # all time in 10000s of a sec.
        block_start = (v[4])

        # generate compressed video list
        blocks.append((block_number, block_name, block_start))
        onsets.append(block_start / 10000.0)

    return blocks, onsets