Chaotic resonance is similar to stochastic resonance, which emerges from chaos as an internal dynamical fluctuation. In the chaotic resonance, chaos-chaos intermittency (CCI), in which the chaotic orbits shift between the separated attractor regions, synchronises with a weak input signal. Chaotic resonance exhibits higher sensitivity than stochastic resonance. However, engineering applications are needed because the internal-system-parameter adjustment requirements, especially the biological systems, to induce chaotic resonance from the outside environment is challenging. Moreover, several studies reported abnormal neural activity caused by CCI. Recently, our study proposed that the double-Gaussian-filtered reduced region of orbit (RRO) method (abbreviated as DG-RRO), using external feedback signals to generate chaotic resonance, achieved controlling CCI with a lower perturbation strength than the conventional RRO method. This study applied the DG-RRO method to two typical psychiatric neural systems with CCI behaviour which reproduces the abnormal neural activity of attention deficit hyperactivity disorder and bipolar disorder. Our finding revealed that the DG-RRO feedback method can shift abnormal irregular activity to healthy ordered activity by the chaotic resonance, maintaining extremely low perturbation of the feedback signal. This outcome has the potential application of the DG-RRO approach in treatment while minimising undesired side effects.