  We explore the role of a scalar meson exchange interaction between quarks in
a semirelativistic constituent quark model where the quarks are subject to a
linear confinement. We search for a variational solution and show that the gap
between the N=1 band and the ground state N=0 band increases with the strength
of the scalar meson exchange interaction potential. This result has good
implications on the description of the low-lying baryon resonances, especially
on the Roper vs. negative parity resonances ordering.
