  A determination of the excited energy eigenstates of the nucleon,
$s=c{1}{2}$, $I={1}{2}$, $N^{\pm}$, is presented in full QCD using 2+1 flavor
PACS-CS gauge configurations. The correlation-matrix method is used and is
built using standard nucleon interpolators employing smearings at the fermion
sources and sinks. We develop and demonstrate a new technique that allows the
eigenvectors obtained to be utilized to track the propagation of the intrinsic
nature of energy-states from one quark mass to the next. This approach is
particularly useful for larger dimension correlation matrices where more
near-degenerate energy-states can appear in the spectrum.
