"Infantile amnesia" occurs despite babies showing memory activity
Briefly

Infantile amnesia, experienced by humans and various mammals, implies memories formed before the age of four often fade away. Recent studies on mice suggest these memories aren't entirely lost; they can be re-activated with genetic modifications. A recent experiment involved training young mice to associate light activation with a mild shock, indicating that while infantile amnesia occurs, some memories might remain dormant and retrievable. Furthermore, research involving human infants' brain activity indicates that memory formation might begin as early as one year, aligning with findings from animal studies.
Mice can lose memories due to infantile amnesia, but recent studies suggest these memories are retrievable under certain conditions with engineered genetic modifications.
Research now indicates that infantile amnesia affects both humans and mammals, with studies in mice providing insights into how memories are retained yet inaccessible.
Read at Ars Technica
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