Tracking the identity of occluded objects requires binding an object’s features to its location to represent exactly which objects are located where, relying heavily on capacity-limited visual working memory. This dissertation aims to examine the capacity and stability of object working memory, and the complexity and fidelity of object working memory representations, in toddlers and young children. A series of four experiments used a novel task to examine 28- to 40-month-old toddlers’ and 5- to 6-year-old children’s visual working memory recall of specific objects in specific locations. I predicted capacity limits would vary with age, presentation/occlusion type, and complexity, and that older children would be able to monitor these limits successfully. Children observed arrays of featurally-distinct objects that were hidden from view either simultaneously (Chapter 2, Experiment 1 and Chapter 3, Experiments 1 & 2) or sequentially (Chapter 2, Experiment 2) and were asked to recall an object’s location. When objects were hidden simultaneously, toddlers showed a capacity of 3 feature-location bindings (Chapter 2, Experiment 1) and 5- to 6-year-old children showed a capacity of 4 feature-location bindings (Chapter 3, Experiment 1), and both showed capacity development, supporting the hypotheses. When objects were hidden sequentially, toddlers’ performance was impacted by whether they had the easier (set size 2) or harder (set size 3) block first, suggesting the structure of the task may have influenced how children divided attention between maintaining and encoding of representations in working memory. Additionally, in Chapter 3, the number of feature bindings that children had to maintain was varied. Children could remember more single-feature objects than multi-feature objects (limit of 4 vs. 3, respectively), suggesting that binding additional features to a representation taxes cognitive resources, as hypothesized. Finally, the study in Chapter 3 explored children’s ability to monitor the fidelity of their visual working memories by asking them to gauge their confidence by placing bets with tangible, at-risk resources. Children modulated their bets appropriately, betting more after providing correct answers and fewer after incorrect answers, as hypothesized. Together, these data help to inform our understanding of visual working memory for feature-location bound objects across early development.
| Identifer | oai:union.ndltd.org:bu.edu/oai:open.bu.edu:2144/45224 |
| Date | 30 September 2022 |
| Creators | Applin, Jessica B. |
| Contributors | Kibbe, Melissa M. |
| Source Sets | Boston University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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