Of popsicles and crackers: when spatio-temporal memory is not integrated into children's decision-making

Area of Science:

• Cognitive Psychology
• Developmental Psychology
• Neuroscience

Background:

• Episodic-like memory, or 'what', 'where', and 'when' (WWW) memory, has been observed in non-human animals through behavioral choices.
• Previous research suggests that WWW memory in animals can be studied using non-verbal, choice-based paradigms.
• This raises questions about applying similar non-verbal methods to assess memory in young children, reducing reliance on verbal recall.

Purpose of the Study:

• To investigate the alignment of children's WWW memory with memory-based choices.
• To examine developmental differences in choice-based memory tasks in children aged 3–5 years and 7–11 years, and adults.
• To understand the integration of WWW memory with concepts like decay and decision-making in different age groups.

Main Methods:

• Two studies were conducted involving children aged 3–5 years (Study 1, n=95) and 7–11 years, plus adults (Study 2, n=168).
• Participants completed choice-based tasks designed to assess WWW memory without significant verbal demands.
• Verbal recall measures were also used for comparison with choice-based performance.

Main Results:

• Preschoolers (3–5 years) showed difficulties with choice-based tasks, likely due to challenges integrating WWW memory with the concept of item decay.
• A convergence between verbal recall and choice-based measures was observed from age 7 onwards.
• This convergence indicates improved integration of memory signals, understanding of state transformation, and decision-making abilities in older children and adults.

Conclusions:

• Young children's ability to utilize WWW memory in choice-based tasks is constrained by their understanding of temporal decay and decision-making processes.
• The development of integrated memory systems, supporting both recall and choice-based assessment, emerges around age 7.
• Choice-based paradigms offer a valuable, less verbally demanding, method for assessing episodic-like memory across development.