  We investigate the fluctuations and correlations involving baryon number in
hot hadronic matter with modified masses of negative-parity baryons, in the
context of the hadron resonance gas. Temperature-dependent masses are adopted
from the recent lattice QCD results and from a chiral effective model which
implements the parity doubling structure with respect to the chiral symmetry.
Confronting the baryon number susceptibility, baryon-charge correlation, and
baryon-strangeness correlation and their ratios with the lattice QCD data, we
show that the strong downward mass shift in hyperons can accidentally reproduce
some correlation ratios, however it also tends to overshoot the individual
fluctuations and correlations. This indicates, that in order to correctly
account for the influence of the chiral symmetry restoration on the fluctuation
observables, a consistent framework of in-medium effects beyond hadron mass
shifts is required.
