The body, unconsciousness, and consciousness can be considered three stages of evolutionary mind from a phylogenetic perspective, which can be further framed as three hierarchies of mind based on dynamic systems theory. These three hierarchies interact via intrapersonal information flow, working together to sustain individual homeostasis. Within a dyadic system, two minds with multiple hierarchies can interact through several basic communication forms (i.e., body-to-body, body-to-unconsciousness, body-to-consciousness, unconsciousness-to-unconsciousness, unconsciousness-to-consciousness, and consciousness-to-consciousness) based on interpersonal information flow. In actual exchanges, these forms are blended and become richer due to intrapersonal information flow. In psychoanalytic therapy, analysts should focus on intrapersonal information flow to enhance patients' self-regulation while emphasizing therapist-patient interaction to execute mutual regulation. Overall, the therapist-patient and mother-infant interaction is a complex communication process.