Retrogenetic models of working memory: Preliminary multi-group analysis

Area of Science:

• Cognitive psychology
• Developmental psychology
• Neuroscience

Background:

• Working memory capacity (WM) is crucial for cognitive functions.
• Understanding WM development across the lifespan is essential.
• Latent structure stability of WM may differ between age groups.

Purpose of the Study:

• To qualitatively compare working memory capacity in young children and older adults.
• To investigate the stability and change in WM latent structure during childhood and aging.
• To utilize Multiple Group Confirmatory Factor Analysis (MGCFA) for structural comparison.

Main Methods:

• The study included kindergarten (4-8 years) and elementary school students, and young-old (60-94 years) and old-old adults.
• Screening involved MMSE, GDS-15 for adults, and Raven's Colored Progressive Matrix for children.
• Working memory was assessed using four measures from the Working Memory Test Battery for Children (WMTB-C).

Main Results:

• Initial MGCFA revealed distinct WM latent structures for kindergarten students, elementary students, young-old adults, and old-old adults.
• When focusing on low-educated young-old and old-old adults, their WM models became similar to that of kindergarten students.
• This suggests a dedifferentiation of WM components in low-educated older adults.

Conclusions:

• The retrogenesis hypothesis is supported when educational level is controlled for (low education).
• Cognitive reserve appears to protect WM components in most age groups, except for kindergarteners.
• A delay in WM development in kindergarteners and dedifferentiation in low-educated older adults support the retrogenetic hypothesis.