Why does visual working memory ability improve with age: More objects, more feature detail, or both? A registered...

Area of Science:

• Cognitive Psychology
• Developmental Neuroscience
• Human Perception

Background:

• Visual working memory (WM) is crucial for cognitive tasks.
• Developmental trajectories of WM, particularly the interplay between object number and feature detail, remain incompletely understood.
• Existing research suggests a non-monotonic development, with potential explanations involving task demands on feature representation.

Purpose of the Study:

• To investigate the developmental changes in visual working memory (WM) across distinct age groups: early elementary (6-7 years), early adolescence (11-13 years), and early adulthood (18-25 years).
• To determine whether age-related improvements in WM capacity are attributable to an increased number of retained objects, enhanced feature-detail memory, or both.
• To examine how varying the required feature-detail impacts performance across different age groups.

Main Methods:

• Employed a visual working memory task where participants recalled object presence, location, and features (color, orientation).
• Utilized a titration procedure to individually calibrate array size for each participant, ensuring consistent task difficulty (approximately 80% correct).
• Manipulated the memory load by varying the number of features participants needed to retain for each object.

Main Results:

• Visual working memory capacity shows significant growth from childhood through adulthood.
• This capacity expansion is characterized by improvements in both the ability to remember object locations and the completeness of remembered object features.
• Age-related gains in WM are not solely due to retaining more objects but also to a richer representation of each object's details.

Conclusions:

• The development of visual working memory involves enhancements in both the quantity and quality of information retained.
• Improvements in feature completeness play a critical role in the maturation of visual working memory across the lifespan.
• Findings clarify the developmental trajectory of visual working memory, highlighting the importance of detailed object representations.