The Infantile Amnesia Phenomenon and the Beginning of Autobiographical Memories

The first years of life are characterized by an absence or paucity of memories, a condition known as infantile amnesia (IA). This study examines the distribution of the early memory recall of young adults, considering the distinction between the first (0-3) and the second (4-6) epoch of IA. We used five categories to classify memories: Perceptual-Visual Fragment, General Semantic Memory, Episodic Fragment, Repeated Episode, Single Episode. Fifty-five students (20 males; mean age = 20.85) were asked to remember their earliest events. We were also interested in understanding the presence of content features. Remembering at first epoch were low; in the second epoch, the frequency of memory increased. Results showed as the presence and number of different types of memory decrease the likelihood of memory being structured as episodic. The participants reported more elements of perceptual-visual fragments, episodic fragments, semantic memories, or repeated events when a well-organized episodic memory does not emerge. These results suggest that the episodic system assumes the role of organizer of the experience and becomes the most relevant form of memory with respect a less structured form of partial remembering. Significant differences were observed in the content features of the different memory types. The offset of IA has a complex articulation, and the complete episodic memories are the last step in the different development stages.