The presence of a heartbeat alone is not considered the sole proof of consciousness. Consciousness is a complex and multifaceted phenomenon that involves various cognitive functions, self-awareness, perception, and the ability to experience subjective states.
During fetal development, the heart and brain are forming, but the fetus is not conscious in the same way as a fully developed human being. Consciousness emerges gradually and is believed to be associated with the development of the cerebral cortex and higher brain functions. The exact moment when consciousness arises in the human brain is still a topic of philosophical and scientific debate.
Memories, on the other hand, are dependent on the development of the brain's memory systems, which take time to mature. The ability to remember past experiences is linked to the development of specific brain regions and neural connections. Memories before a certain age are often not retained due to the lack of well-formed memory systems in early development.
Regarding the concept of filters on the mind of a child, it's essential to distinguish between the biological development of the brain and cognitive processes like memory formation, self-awareness, and perception. As a child grows and experiences the world, their brain develops and forms connections that shape their perception and understanding of the world around them.
In summary, consciousness is a complex phenomenon that goes beyond the presence of a heartbeat. It emerges gradually during brain development and is associated with various cognitive functions. Memories may not be retained from early stages of life due to the immaturity of memory systems, and experiences shape a child's perception of the world as they grow and develop.