Final answer:
The infantile psyche is characterized by dependency and the need for trust development through the caregiver's responsiveness, which shapes the infant's perception of the world and is pivotal for future psychosocial milestones.
Step-by-step explanation:
The infantile psyche is marked by its dependency on caregivers for both physical survival and emotional development. Erikson highlighted the trust versus mistrust stage during our first 12 months of life, indicating that the responsiveness of caregivers to an infant's needs cultivates a sense of security and sets the foundation for viewing the world as a safe place. When caregivers consistently meet an infant's needs, they reinforce the child's innate dependency and foster the establishment of a healthy sense of trust, which is essential for the formation of secure attachments and subsequent psychosocial milestones, like the development of a positive self-concept.