function firstMoves = grabFirstMoves(expmt, survival, irange, useCalledFirst)

    firstMoves = zeros(1,length(irange));

    for i=irange
        if ~strcmp(survival{i,'Auto_notes'},'drop')
            if useCalledFirst
                firstMoves(i) = survival{i,'Corr_first_mvmt'};
            else
                firstMoves(i) = find(~isnan(expmt.Centroid.data(:,2,i)),1);
            end
        else
            firstMoves(i) = 1;
        end
    end

end