function[objs] = setLabelRelativeToLabel(objs, target, pattern, time)

if nargin ==2
    pattern = type;
end

for o = 1:length(objs)
    for s = 1:length(objs(o).sessions)
        % ignore type for now
        objs(o).sessions(s) = objs(o).sessions(s).setLabelRelativeToLabel(type, pattern);
    end
end