Development of Episodic Memory and Foresight in High-Functioning Preschoolers with ASD.

To investigate the early development of episodic memory and future thinking in autism spectrum disorder (ASD), we selected 94 participants each from a group of ASD and typically developing (TD) preschoolers. They were required to remember newly-acquired knowledge sources and anticipate action timings necessary for future events. Five-year-old children with ASD remembered their knowledge sources similar to TD children; however, the 6-year-old children performed more poorly than their TD counterparts. ASD children failed to anticipate future action timings in comparison with TD children. Although source memory and future thinking were related in TD children, they were unrelated in children with ASD. The results suggest that episodic memory and foresight are deficient and unintegrated in ASD children during the preschool years.