We report discrepancies between the results presented in Fig. 1 of a recent paper of Yasuike and Someda [Phys. Rev. A 66, 053410 (2002)] and our independent calculation. At the frequency = 0.55 a.u., we find that the state of the one-dimensional modified Pöschl-Teller potential, described by the authors as light induced and originating from a shadow of the field-free ground state, is in fact physical for ␣ 0 Ͻ 10 a.u. and its origin is the zero-energy antibound state of the bare potential. For = 0.45 a.u., we also find differences in one of the presented quasienergy trajectories in the low ␣ 0 region ͑␣ 0 Ͻ 0.4 a.u.͒, but we confirm the starting point at E = −0.5 a.u. for both quasienergies, as found by Yasuike and Someda.